Re: ORGLIST:The same chemical structure, but different CAS#, why?

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From: Jonathan Brecher (jsb$##$cambridgesoft.com)
Date: Mon Nov 10 2003 - 12:02:00 EST

At 9:33 PM -0500 11/8/03, Jiang Heng wrote:
>Hello, everybody,
>
>The following substance is the same structure, but different CAS#, who can
>tell me WHY?
>CAS 124-76-5 (isoborneol)
>CAS 507-70-0 (borneol)
>CAS 464-45-9 (bicyclo[2.2.1]heptan-2-ol, 1,7,7-trimethyl)
>
>see the attach file for the chemical structure.

The three CAS numbers you list refer to three different substances. All
three substances have the same chemical connectivity, but they do NOT have
the same stereochemistry. Hence, they are different.

In general, it is not productive to ask questions about CAS numbers to
anyone other than CAS. And even if you do ask someone else, you should not
trust their answer (including mine) until CAS confirms its accuracy. CAS
is the *only* authoritative source for information about CAS numbers.

Jonathan Brecher
CambridgeSoft Corporation
jsb$##$cambridesoft.com
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