Needing help with Chemistry assignment!?

Question

Label, with an asterisk, every chiral carbon atom in the molecular structure of the antibiotic Aclacinomycin A.

Picture: http://img34.picoodle.com/data/img34/3/8/31/f_Aclacinomycm_4b73035.jpg

(if you could just describe where that would be great)

Thanks!

Answer 1

Hello,

I count 13  chiral carbon atoms.   Every carbon that is not carbonyl or CH2 would appear to be chiral   None of the carbons in the top 3 left rings is chiral. In the top right ring,  the COOCH3,  OH bonded and O- bonded carbons are chiral.   In the second from the top at right,  the two O- bonded,  OH bonded and N(CH3)2 bonded carbons are chiral.  In the third from the top at right,  the two O bonded,  OH bonded and CH3 bonded carbons are chiral.   In the fourth from the top at right (bottom ring),  the O bonded and CH3 bonded carbons are chiral.  That's 13 chiral carbon atoms.