Acta Chimica 4. (1954)
1. szám - M. Láng–M. Vizesy: Investigation of the spectra of diastereoisomers (Preliminary communication)
2 L. LANG and M. VIZESY cis compounds. That is, the spectra of all of the trans isomers must lie either higher or lower than the spectra of all of the corresponding cis isomers. Following this trend of thought, we have come to the conclusion that groups in the side-chain having a trans orientation interfere with one another’sfield to a lesser extent than those having a cis constitution and, consequently,, the resulting substitutional effect of the chain as a whole must be greater in the former than in the latter case. As a greater substitutional effect increases the probability of the transitions,, the characteristic extinction data should be higher in the absorption spectra of the trans than in those of the corresponding cis isomers. Table I I. /% II 1 \S b.p. 80,12° Ha.f X-CH-CH-CH3 \=/ 1 1 OH NH—CH3 m.p. 114° lib. NH—CH3 ■f 4—CH-CH-CH, \=/ , OH m.p. 76° Ilia. 4 4—CH-CH-COOH \=/ 1 1 OCH3 Br m.p. 184—185° Illb. Br /^Ч-СН-СН-СООН x=/ 1 OCH3 m.p. 140-141° IVa.€ Ч-СН-СН-СООН x=x 1 1 OCH3 nh2 m.p. 246° IVb. nh2 f Ч-СН-СН-СООН x=/ 1 OCH3 m.p. 214-215° У. °2N-<“> b.p. 210,9° Via. 02N \ - CH - CH - CH2OII x=x 1 1 OH nh2 m.p. 103 —105° VIb. nh2 02N—X—CH—CH—CH2OH \=/ 1 OH m.p. 142-143°