Very interesting topic and potentially quite troublesome. So when looking for 3DG glycosylating sugars I found 3-deoxyglucosone   listed as CAS No.: 4084-27-9 and also CAS No.: 82399-12-0 and another CAS No.2490-91-7; the first two seem to be the same compound and the third seems to be an entirely different substance.

This because isomers of the same molecule are assigned separate CAS numbers, as are sometimes entire classes of chemicals. Plus historical synonyms may have been applied for separably, and it is probably hard to keep all those 129 Million chemicals and growing straight! :-)

Thanks Kirk,

About the different isomers there is no problem! My concern is really about same chemicals having different cas numbers. its probably the synonyms as you mentioned! Thank!

The reason is that isomers of the same molecule are assigned separate CAS numbers.

there are three kinds of chemicals.

1. There are some atoms existing in isotope in these molecules.

2. These chemicals are mixtures of mutiple compounds.

3. These chemicals are meso isomers..

From the industrial point of view.. Some chemical names refer to Family names rather than exact formulas, especially if the molecule was made out of a natural  resourced raw materials such as TOFA,  CANOIL , petroleum fraction...etc which usual contains a mixture of molecules ( TOFA has different ranges of fatty acid from C8 to C22, and the source of the TOFA determines the chain length distribution of it, i.e how much C8 compared to C10,C12  C14 etc.. 

The American TOFA has different ratio of C14-C16 than the European or the Asian, and of course the French TOFA will be different than the Swedish etc... If we mace a fatty amine out of these TOFA's , each of them will have its own CAS NO..  

Very interesting topic and potentially quite troublesome. So when looking for 3DG glycosylating sugars I found 3-deoxyglucosone   listed as CAS No.: 4084-27-9 and also CAS No.: 82399-12-0 and another CAS No.2490-91-7; the first two seem to be the same compound and the third seems to be an entirely different substance.

Hi 

Please let me know I am searching for cas no for cornmint oil i.e Mentha arvensis oil which is registred by my company for cornmint oil ,but in clp its show two more cas no .

Substance identity EC / List no.: 290-058-5

CAS no.: 68608-35-5, 68917-18-0, 90063-97-1

Mol. formula: C20H38O2

 Please let me know why its not about isomers or like ...because it is oil not just a single chemical ...

thanks 

SANDEEP BALUNI

email. [email protected]