Asymmetric cycloaddition routes to both enantiomers of trans-9,10-dihydro-9,10-ethanoanthracene-11,12-dicarboxylic acid
作者:Linda Thunberg、Stig Allenmark
DOI:10.1016/s0957-4166(03)00172-1
日期:2003.5
S)-enantiomer and di-(+)-iso-menthyl fumarate the (+)-(R,R)-enantiomer of the acid. The other fumarates, obtained from (−)-borneol, (+)-fenchol and (−)-isopulegol, likewise gave the (−)-(S,S)-enantiomer of the acid. The absolute stereochemistry of the products was confirmed via a single crystal X-ray crystallographic structure determination of the brucine salt of the (−)-(S,S)-enantiomer.
Facile synthesis of vinyl copolymers with optical activity arising from the configuration of stereogenic carbon atoms in the main chain
作者:I. H. Donnelly、P. Kambouris、D. C. Nonhebel、D. C. Sherrington
DOI:10.1039/c39950001235
日期:——
Hydrolytic cleavage of the alkyl chiral auxiliaries from copolymers of diborneyl and dimenthyl fumarates each with styrene, yields optically active vinyl copolymers of fumaric acid and styrene in which the chirality is due to the main chain.