“…Most of the pertinent reports are concerned with shorter conjugated systems, e. g. cis-cis, cis-trans, and trans-trans dienes [RASMUSSEN et al (383,385,386); SHEPPARD et al (4°5,404) A modem survey of this field has been presented by BRAUDE and WAIGHT (4I); d. also ALLAN et al (7), COLE (67), and writer (498).…”