From: "Paul Heelis" Subject: New chemistry jobs vacancy site To
Subject: ORGLIST: A plea for correct usage of subject line
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Subject: ORGLIST: A plea for correct usage of subject line The last six posting to this list have not had useful subject lines. Can I please ask posters to carefully compose one. If replying to a posting which did not have a useful subject, please add one.
unlikely to be read by many people, and cause problems with the archiving and searching --
Dept. Chemistry, Imperial College, London, SW7 2AY, UK. http://www.ch.ic.ac.uk/rzepa/ __________________
bisarylmethanes of general formula X-Ar-CH2-Ar-X, where X is an deactivating, meta-directing group (like sulfonic or phosphonic acid). ?
acid), where reaction with formaldehyde leading to bisarylmethanes was carried out in the concentrated sulfuric acid medium. The products were precipitated by the addition of water. But how to separate water soluble bisarylmethanes containing phosphoric or phosphonic acid groups (quite strong acids , pKa about 1 and 2, respectively) from its solutions in concentrated sulfuric acid ? Thank you in advance for any suggestions Michal Kedzierski Industrial Chemistry Research Institute, ul.Rydygiera 8, Warsaw, Poland
sample.
then sample elution with NaCl or CH3CO2-Na+ advantage : separation of mono acids from diacids, finally : extraction at pH 1 or desalting with sephadex G-10 from sigma = (elution with distilled water) Stephane Roux
tri-TBDMS protected guanosine. It seems that in pyridine/acetic anhydride/cat. DMAP, a di-acetylated product forms from the beginning of the reaction that becomes the main product after prolonged reaction. Could someone hint on how to avoid it or point out any references where this problem is tackled. TIA __________________
i'm Sony. Now I,m doing my research but i have some trouble whit it. my problem is quite difficult to synthesis dihexildithiocarbamat. Anyone can help me, please. Thanks Sony nb: please contact me to Shandysr@yahoo.com as soon as possible __________________ Date: Fri, 28 Apr 2000 16:38:16 +0200 From: Jonas Nilsson Subject: ORGLIST: Production of deuterated solvents Dear Members My collegue an I was discussing over a cup of coffe about how isotopically enriched materials are produced. Especially deuterated solvents are of interest. I just read on the internet about how "heavy water" was made during world war two by careful electrolysis of large quantities of water which if I understand it right tends to make H2 leave easier than both HD and D2, thus enriching the remainder in deuterium.
Is this still how it is made? Is the product in this process mainly D2 or D2O? How are solvents like deuterated methanol/chloroform/DMSO/acetone/dichloromethane produced? Some of them could be done by simple treatment of undeuterated solvent with strong base/excess D2O i guess.
enrichments? /jN -- _____________________ _____________________ | Jonas Nilsson | | | |Linkoping University | | Telephone | | IFM | | --------- | | Dept. of Chemistry | | work: +46-13-285690 | | 581 83 Linkoping | | fax: +46-13-281399 | | Sweden | | home: +46-13-130294 | |_____________________| |_____________________| __________________ Date: Fri, 28 Apr 2000 18:12:49 -0000 (UTC) From: Pollywog Organization: The Pond Subject: RE: ORGLIST: Production of deuterated solvents The processes used now are described in: http://www.ornl.gov/risk/t_section8.html -- Andrew
__________________ MAY 2000 Date: Sat, 29 Apr 2000 03:46:42 +0100 From: Wei Wang Organization: SJTU Subject: ORGLIST: a question :-) Dear Members I have a question concerning a product. I want to know who produces 2-(3-chloro-)phenylbenzimidazole and who uses it? thanks a lot Michael
B98111091 Mail Box School of Chemistry an Chemical Engineering Minhang Campus, Shanghai Jiao-Tong Univ. 800 Dong Chuan Road Minhang, Shanghai CHINA Zip:200240 Tel:021-54741499 Fax:021-54643270 ********************************************** __________________
cholesterol. The test is required by a compendia, therefore I must use it. I need to purchase about 10 to 100 grams a year. Does anyone know of a source where I can purchase this compound? I have tried the normal suppliers in the USA (Fluka, Acros, TCI, Sigma, Aldrich, Supelco, VWR, Fisher). I have tried the Internet for different chemical supply search engine. __________________ Date: Tue, 2 May 2000 10:44:23 -0700 From: Jim Sims Subject: ORGLIST:pregnenolone isobutyrate I can think of two solutions. One, synthesize it yourself from pregnelone and isobutyric acid both available. It should be an easy esterification. Second, have it done for you, either by a colleague or by a custom synthesis company. Good luck. Professor Jim Sims Department of Plant Pathology University of California, Riverside Riverside, CA 92521 Voice: 909 787 4127 FAX 909 787 4294 __________________
suplier of CAS 38231-86-6 or 112067-63-7 or 128572-99-6 (valienamine) A search in chemweb (thanks to Luis Fernando Garc=EDa Alles..) was = without any success! TiA Steven
ReseaChem GmbH Pestalozzistrasse 16 CH-3400 Burgdorf
Fax: ++41 34 424 03 12 ------------------------------------------------- __________________ Date: Tue, 02 May 2000 16:28:55 -0600 From: Manuel Gonzalez Perez Subject: ORGLIST: CELLULOSA SOLVENT... SOMEBODY KNOW WHAT IS THE SOLVENT OF CELLULOSE? TANKS
Date: Tue, 2 May 2000 14:45:35 -0700 (PDT) From: Eugene Leitl Subject: ORGLIST: CELLULOSA SOLVENT 1) Schweitzers Reagens (aqueos Cu(II)/ammonia complex) 2) Cellulosexanthogenat is soluble in CS2 (cellulose treated with 15%-25% aqueous NaOH, CS2) 3) 4-methyl-morpholin-4-oxide (?) __________________
Cellulose itself is an unbranched polymer of glucose subunits. The best solvent for glucose is water. Cellulose can be reacted or degraded but not dissolved intact.
__________________ Date: Thu, 27 Apr 2000 13:38:02 -0500 (GMT) From: "Research Scholars,tpr" Subject: ORGLIST: Synthesis of 3,4-trans-dihydroxypyrrolidine Hi! can anybody give me any information about the availability/synthesis of 3,4-trans-dihydroxypyrrolidine? Sorry for reposting this message. thanking all palas G ******************************************************************************* Research Scholar Email:tprscrs@ Dr. T.P.Radhakrishnan's Group uohyd.ernet.in Theoretical & Material's Chemistry Group Tel:(040)-3010500 School of Chemistry x-4827, 4750 University of Hyderabad Hyderabad-500 046 India ******************************************************************************* __________________ Date: Fri, 28 Apr 2000 12:00:21 +0530 (IST) From: Joseph Swaroop Mathen Subject: ORGLIST: chem-ztg. Does any one know from where the jorunal "Chem-Ztg." is published and what language its in. Thank you With warm regards to all fellow organic chemists Swaroop ______________________________________________ Joseph Swaroop Mathen Division of Organic Chemistry RRL, CSIR, Ind. estate Post, TRIVANDRUM, INDIA 695 019 e-mail: swaroop@csrrltrd.ren.nic.in jsmathen@rediffmail.com Visit me at http://jsmathen.tripod.com Tel: +91-471-490674 ext. 259 Fax : +91-471-491712 __________________
> Cellulose can be reacted or degraded but not dissolved intact. This is arguable for Schweizers reagens. Both conc. aqueous HCl and xanthogenate process do reduce the average molecular mass. __________________
> Does any one know from where the jorunal "Chem-Ztg." is published > and > what language its in. > Thank you > With warm regards to all fellow organic chemists It is published in Germany, I believe, and in the German language. Its full name is Chemiker Zeitung. -- Andrew
__________________ Date: Wed, 03 May 2000 10:20:56 -0400 From: Jack Sullivan Subject: Re: ORGLIST: chem-ztg. Pollywog wrote: >
> On 28-Apr-2000 06:30:21 Joseph Swaroop Mathen wrote: > > Does any one know from where the jorunal "Chem-Ztg." is published > > and > > what language its in. > > Thank you > > With warm regards to all fellow organic chemists > > It is published in Germany, I believe, and in the German language. > Its full name is Chemiker Zeitung. >
> -- > Andrew
1991 with vol. 115 issue 12. It was published monthly by Verlagsgruppe Huthig, Zeitschriften Abteilung, 69018 HEIDELBERG, Germany. The ISSN is 0009-2894. The language is German.
libraries. -- Jack Sullivan __________________ Date: Thu, 04 May 2000 11:08:12 +0200 From: AnGio' Subject: ORGLIST: Processing NMR data by software dear readers, i think some of you often deals with elaborating your own NMR data by a suitable software, as Mestre-C for istance (this is the one i found on my pc), acting directly on FIDs giveng in the "native" format by the spectrometer (say Bruker). Those software come most of the times with a pletora of options which may create some difficulties to those who are not much confident with elaborating procedures of signal.
some hints and suggestions in order to a obtain a decent conversion of the signal. For istance, what do you usually do before applying a FT on signal? If any short e-guide is around, let me know... Thank you very much. Andrea.
********************************************************************* Andrea Giordano c/o tel. ICN: 06 - 90672-510/516 CNR- Ist. Chimica Nucleare fax. ICN: 06 - 90672512 Via Salaria km 29.300 C.P. 10 cell: 0349 - 7512467 00016 Monterotondo Stazione (Roma) Italia
>> Happiness is easy << ********************************************************************* __________________
or http://www.ccl.net/cca/software/MS-WIN95-NT/MestRe-C/tutorial.zip __________________ Date: Sun, 7 May 2000 01:13:51 EDT From: DrXoas@aol.com Subject: ORGLIST: Retorts Org listers: I know that this is an odd request, but bear with me. I am a recently retired organic chemist. I had worked hands on in the research labs in pharmaceuticals and agricultural chemistry for 30 years. I am assembling a collection of "antique" lab glassware. I need a couple of classical retorts to complete one set. Just about any size would do. Can anyone help? Larry Brannigan __________________ Date: Mon, 08 May 2000 19:28:28 PDT From: Subject: ORGLIST: Secondary alcohol from alkene Dear All I am trying to make a secondary alcohol from alkene by using either H2SO4 or HClO4 as catalyst with Formic acid. I found some literatures about this reaction but my experiment was unsuccessful. There are two questions that I want to ask 1. Every time I reflux the reaction the colour always changes to dark brown. Is there any way I can avoid it? 2. How do I control the reaction condition since it seems that nothing had happened in my own reaction? The literature was published in 1953 (or 1955 on JACS) (the one I found) but I don't have it with me at the moment. I will put it up if anyone want to know the exact detail.
9-5-00
__________________ Date: Tue, 09 May 2000 10:52:36 +0400 From: Valentine Ananikov Organization: IOC Subject: ORGLIST: [4+2] cycloaddition Dear Orglist Members, I am looking for the first literature precedent of vinylacetylene and acetylene [4+2] cycloaddition reaction to give benzene as a final product. Does anybody know the appropriate references ?
possible to trace them backward. Also in general, is enyne + alkyne [4+2] cycloaddition a useful way for aromatic ring construction ? Any references/comments are appreciated. Thank you! Valentin. ==================================================================== , , , ,
Valentine P. Ananikov |\\\\ ////| /////| NMR Group | \\\|/// | ///// | ND Zelinsky Institute of Organic Chemistry | |~~~| | |~~~| | Leninsky Prospect 47 | |===| | |===| | Moscow 117913 | | | | | | | Russia | | A | | | Z | | \ | | / | | / e-mail: val@cacr.ioc.ac.ru \|===|/ |===|/ http://nmr.ioc.ac.ru/Staff/AnanikovVP/ '---' '---' Fax +7 (095)1355328 Phone +7 (095)9383536 ==================================================================== __________________ Date: Tue, 09 May 2000 13:00:23 +0200 From: Jacob Zabicky Subject: Re: ORGLIST: Secondary alcohol from alkene Hello William, 1. It goes with the trade! A good organic chemist is never affraid of color developing in a concoction. Perhaps--a very reserved perhaps--on using reagents of very high purity or working under special conditions, such as total darkness or avoiding the presence of oxygen, this can be reduced or avoided.
be very deteriorated and should be purified or disposed of. All the best, Jacob ******************************************************************* Temporary address: Prof. Jacob Zabicky Tel.: +34 93 581 1401 Group de Fisica dels Materials II Fax.: +34 93 581 2155 Universitat Autonoma de Barcelona Private Tel.: +34 93 581 7485 08193 Bellaterra (Barcelona) Spain ******************************************************************* __________________ Date: Tue, 09 May 2000 07:45:14 -0600 From: Manuel Gonzalez Perez Subject: ORGLIST: ORGANIC-INORGANIC HYBRID Friends: I am traying to make an organic-inorganic hybrid by reaction "cellulose + titanium isopropoxide" 1.- Do you know about the best condiction for reaction? 2.- Do you know how I should purify the product? tank you! __________________
I want all of tou to help me to get the melting point of N-phenyl-p-nitrobenzohydroxamic acid since I failed to get it in a literature available in Sudan. Thanks to all. A/Hafeez Mohamed P.O.Box 321, Department of chemistry, Faculty of science, University of Khartoum, Sudan. email: ahafeez61@yahoo.com __________________ Date: Tue, 09 May 2000 17:28:07 +0200 From: Fredrik Thorstensson Subject: ORGLIST: Stability of allenes Hello dear Orglistmembers I wonder if any of you have any practical experience of allenes. My question is if it is possible to run an ordinary flashcolumn on Ethyl-buta-2,3-dienoate.
it would just be nice to hear from someone with little allene experience. /FT __________________ Date: Wed, 10 May 2000 08:42:18 -0700 (PDT) From: Gustavo Dartayet Subject: ORGLIST: Isolation from PTC Dear Orglistmembers: I am trying to make an isolation of my ether from a phase transfer catalysis reaction btween a phenol. bromoethane and Aliquat or benzyltriethylammonium chloride. I destilled the the product of the reaction from the organic phase, but the the product is mixed with the ammonium salt. How could I eliminate the salt previous to the destillation? Thanks
gdartay@yahoo.com Buenos Aires Argentina __________________ Date: Wed, 10 May 2000 18:30:41 +0200 From: Subject: Sv: ORGLIST: Isolation from PTC
prior to an aqueous work up. __________________
now online. You can access it by going to our web site www.arkat.org , = becoming a member by clicking on the "JOIN" button. Then you can login = and "ENTER JOURNAL". It is all free! We have received notice from ISI and CA that Arkivoc will become part of = these searchable databases. You will notice that Arkivoc is a very high quality journal in terms of = content and presentation. By publishing in Arkivoc authors have the = widest possible global reach - at no cost to the user.
libraries Volumes of Arkivoc will be bound. This work is presently in = progress.
world-wide with fellow Chemists. Full instructions are on our web site. If you have any questions, suggestions on other projects or general = comments for us to do better, please contact us. Yours sincerely, Paul Thind CEO ARKAT __________________ Date: Thu, 11 May 2000 11:08:22 +0100 From: "F.J. Lalor" Subject: Re: Sv: ORGLIST: Isolation from PTC > > Dear Orglistmembers: > >
> > I am trying to make an isolation of my ether from a > > phase transfer catalysis reaction btween a phenol. > > bromoethane and Aliquat or benzyltriethylammonium > > chloride. I destilled the the product of the reaction > > from the organic phase, but the the product is mixed > > with the ammonium salt. How could I eliminate the salt > > previous to the destillation? > > Thanks > > > > Gustavo Dartayet > > gdartay@yahoo.com > > Buenos Aires > > Argentina
organic phase and washing several times with water? -------------------------------------------------- Dr. Fergus Lalor, Senior Lecturer, Chemistry Dept., University College, Cork, IRELAND. Telephone: 353-(0)21-902317. Fax: 353-(0)21-274097 __________________
from our undergraduate lab class. The reaction with acids should go smoothly (colour change trivial as was suggested), however, the success of the reaction does hinges on the work-up step. You have to make sure all traces of acid used in the reaction are thoroughly removed from your crude product (by successive washing with carbonate solution, for example). If not, when you distil the product alcohol in the purification, the acid could re-protonate your OH, and eliminates to give your alkene back again, leaving a smothering char behind!!
Department of Chemistry King's College London Strand
London WC2R 2LS email: mimi.hii@kcl.ac.uk tel: +44 (0)207-8481183 fax: +44 (0)207-8482810 or +44 (0)870-0636196 __________________
1,4,7,10-tetraazacyclododecane, cyclen. Could anybody help in this? Mean literature or your own data.
===================================== Dr. Sergei Z. Vatsadze Research Fellow Department of Chemistry M.V.Lomonosov Moscow State University 119899, Moscow Russia
Phone: (095) 939 4020 (095) 939 2292 E-mail: szv@org.chem.msu.ru ===================================== __________________
OrganometChem conferences. So far I used ChemCenter but unfortunately I found that this source is incomplete. For example I did not find the information about OrganometChem conference in Shanghai (July 2000). Thanks in advance.
Ilfir R. Ramazanov, Ph.D., Laboratory of Catalytic Synthesis Institute of Petrochemistry and Catalysis, pr. Oktyabrya, 141, Ufa, 450075, Russia. mailto:elf@anrb.ru Visit my homepage and find some QC software http://members.tripod.com/~ChemELF Visit our lab web page http://organomet.cjb.net __________________
You may consult J.Chem.Soc.Perkin Trans1. In every issue there is a "Conference Diary". Asish De
Department of Organic Chemistry, Indian Association for the Cultivation of Science, Calcutta - 700 032. INDIA
__________________ Date: Mon, 15 May 2000 12:17:23 +0200 From: AnGio' Subject: ORGLIST: Replies at "NMR data processing software" Dear OrgLIST readers, I've been asked by the list coordinator to summarize replies at my previous post titled "NMR data processing software" dated 04 May 2000, so here it is...I also want to indicate a NMR-related web sites which I think could be of interest. To those of you who may still not know, WIN-95/98 MestRe-C is a program capable of processing NMR FIDs and it is freeware. The latest version is 2.2 and you can download it from here:
your feedback to support future developments. Mr. Chapman, R. has indicated a tutorial guide concerning all topics from treatment of FID signal to its conversion into spectrum using MestRe-C program. The file is one large compressed Word document (you need WinZIP or similar to decompress), which is actually very uncomfortable to handle, due to its extreme lenght, about 20 Mb decompressed. Loading such file into Word program is kind of frustrating, expecially on slow machines. Thus I have edited this one large file and changed the format of all the graphic images, plus added a cover. The entire document is now about 165 Kb, and it has been ZIP compressed into the file M-tutorial.zip, which can be downloaded by anonymous ftp from helium.dq.fct.unl.pt. You need WinZIP or similar to decompress.
applied, Mr. Carniaux, J.F. suggested the following: " Generally before to go for the FT it's quiet a good idea to make an exponential correction of the "crude" FID, for that (if you're using MestRe) go through the menu "process" Appodize (or click onto ), and the value commonly used are Lb=0.3 for an 1H and Lb=3 for a 13C. (which are the value used into the automatic operation by the brucker sofware)
for 1H and Lb -3 Gb 30 for 13C, this will make the signal sharper....but personally I'm very happy with the normal Lb 0.3 or 3."
remarkably rich in contents. Of interest the "Links" section, with some database of NMR spectra which can be freely downloaded.
A. Giordano. ********************************************************************* Andrea Giordano c/o tel. ICN: 06 - 90672-510/516 CNR- Ist. Chimica Nucleare fax. ICN: 06 - 90672512 Via Salaria km 29.300 C.P. 10 cell: 0349 - 7512467 00016 Monterotondo Stazione (Roma) Italia
>> Happiness is easy << ********************************************************************* __________________ Date: Mon, 15 May 2000 12:21:14 +0200 From: AnGio' Subject: ORGLIST: M-tutotial.zip at helium.dq.fct.unl.pt Dear readers, M-tutotial.zip is a tutorial guide to MestRe-C software which can be downloaded now by anonymous ftp from helium.dq.fct.unl.pt. Please read my post "Replies at NMR data processing software" for further informations.
A. Giordano. ********************************************************************* Andrea Giordano c/o tel. ICN: 06 - 90672-510/516 CNR- Ist. Chimica Nucleare fax. ICN: 06 - 90672512 Via Salaria km 29.300 C.P. 10 cell: 0349 - 7512467 00016 Monterotondo Stazione (Roma) Italia
>> Happiness is easy << ********************************************************************* __________________
Rafael
__________________ Date: Mon, 15 May 2000 09:18:11 -0700 From: "Chapman, Robert D" Subject: RE: ORGLIST: Conferences http://www.liv.ac.uk/Chemistry/Links/conferences.html and many other links to listings of conferences therein __________________ Date: Mon, 15 May 2000 22:33:02 +0200 From: TT Subject: ORGLIST: Isoprimeverose My first message to this list Who knows why the disaccharide isoprimeverose is called in such a manner? thanks for answers or links or info Sincerely - TT __________________ Date: Tue, 16 May 2000 10:49:11 +0200 From: Eva Horn Moeller Subject: Re: ORGLIST: Isoprimeverose Dear TT, this line of thought was guesswork from the beginning, but research on the web gave some slightly more solid indications:
=B4s
names?) =3D maybe "Primula veris", in English Cowslip. The link Yüklə 2,96 Mb. Dostları ilə paylaş:
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