In the series of unsubstituted linear polyenes, H (CH= CH) nH, the fist four members are known. By application of the sodamide-liquid ammonia coupling of allylic halides 'to pentadienyl and heptatrienyl halides, what are undoubtedly the n= 5 and n= 7 members of the series have now been prepared. Decapentaene was obtained in 5% yield as cream- colored crystals melting at cu. 145'; tetradecaheptaene, in minute yield, only as an impure ...
