Syntheses and Absolute Configurations.-The synthesis and absolute configuration of (-)-(R)- 1 has previously been described. 6 Optically active (+)-(S)-2 was prepared by the addition of phenyllithium to known'(+)-(E)-l-chloro-2, 2-diphenylcyclopro-panecarboxylic acid. The syntheses of 3 and 4 were achieved in an analogous manner to that of 1 and 2. This involved the addition of diasodiphenylmethane to a-fluoro and a-methoxy acrylate, which ...
