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| | From:  JIA-jun1 (Original Message) | Sent: 12/16/2007 3:04 AM |
Dear I have a question about how to find the latest articles, especially on organic synthesis.Can you give me a suggestion? And you can give the latest progress on the "Chemistry Corner".Thanks! Best wise JIA-jun1 |
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| | | From: ·Steve· | Sent: 12/16/2007 9:30 AM |
If you have access to a good research library with subscriptions and back issues to important journals such as the Journal of Organic Chemistry, etc., you will be in good shape. Access to online journals is very limited unless you have paid subscriptions.
I need to check and update the Chemistry Corner links and perhaps add some of these. There are so many good chemistry Internet sites available, I now rely more on keyword searches rather than maintaining an extensive number of links here, but I still like to add good ones to the Chemistry Corner lists. Otherwise, there is not much recent "progress" with the Chemistry Corner, except for answering questions on the message boards. MSN chemistry groups have never been very active when compared to some others listed under "More Communities" in terms of number of members and message posts. Still, I always enjoy answering questions that are posted here. Welcome!
Steve
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| | | From: ·Steve· | Sent: 12/16/2007 8:35 PM |
I should mention Chemical Abstracts Service, which many colleges subscribe to for their faculty and students to use. Chemical Abstracts gives an abstract of the publication, not the full article. Online Chemical Information
http://www.hellers.com/steve/resume/p100.html"A brief summary of the chemical information available online in computer systems around the world are described and discussed. Both databases and software systems will be included." Chemical Abstracts Service (CAS) (subscription)
http://www.cas.org/"Chemical Abstracts Service, CAS, is the producer of Chemical Abstracts, SciFinder, SciFinder Scholar, and co-partner in operating STN International, all of which provide comprehensive, authoritative and reliable access to chemical and scientific information from databases covering topics such as chemistry, engineering, patents, medicine and regulatory data."
ONLINE CHEMICAL REFERENCE DATABASES
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| | | From: ·Steve· | Sent: 3/10/2008 7:29 AM |
The formula you have, C3H6Br2, is the molecular formula. A molecular formula tells gives the number of each kind of atom in the molecule, but it does not tell us what the structure of the molecule is. By definition, isomers have the same molecular formula but different structures.
Formulas that show the structure with all the bonds are simply called structural molecular formulas. These can be condensed to simpler-looking formulas that are easier to write. This is the condensed structural formula.
H H Br
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H–C–C–C–H This is the structural formula of 1,1-dibromopropane.
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H H Br
The condensed structural formula is
CH3CH2CHBr2
The condensed structural formula can show some bonds for clarity:
Br
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CH3CH2C–H
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Br
Steve |
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