Why cyclopentane has b12 number of hydrogen atom in state of 14
Answers
Vitamin B12 is the only known essential biomolecule with a stable metal-carbon bond, that is, it is an organometallic compound. The cobalt can link to:
a methyl group - as in methylcobalamin
a 5'-deoxyadenosine at the the 5' positon - as in adenosylcobalamin (coenzyme B12
a cyanide group - as in Vitamin B12 - as supplied from drug companies
The particular link in the cobalamin has a profound effect upon the mechanism of the enyme reaction.
A methyl-nickel intermediate on acetyl-CoA synthase is also known, but only as an intermediate rather than a stable, isolable compound as the three cobalamins. Other organometals such as the methylmercury ion are highly toxic, it is interesting that there is an unfortunate connection between CH3Hg+ and methylcobalamin.
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