... B.UCHYTIL and M.PROCHAZKA Department of Organic Chemistry, Charles University, 128 40 Prague 2 2085 ... IR spectrum: 2 275 em - 1 (CN), 1 746 em -l (C= O), 868 and 1010 em -l (cyclopropane ring absorption2 ). Collection czechoslov. Chern. Commun. [Vol. 39) [1974) ...