STUDIES ON THE STRUCTURE OF FORKED CONJUGATIVE SYSTEMS——THE CONFORMATION OF 3-ACETYL-8-PHENYL-3,5,7-

• 作 者: 白春礼 傅亨 唐有祺
• 机 构: Institute of Chemistry, Aoademia Sinica, Beijingrrrrrrrrn,Institute of Chemistry, Aoademia
• 出 处: Science in China,Ser.B
• 发表日期: 1985年11期
• 关键词: conjugated steric conformational ordinary branch acetyl basically shorter Phenyl

The conformational properties of the title molecule in the isolated state have been investigated by the PCILO method and compared with those found from X-ray crystallographic determination. The results indicate that, in this type of forked conjugative series, because of steric hindrance, only one branch of the forking groups is basically coplanar with the conjugated trunk chain and plays the role of a terminal group, while the other one is not coplanar with the conjugated trunk chain and acts as an ordinary substitutent. Referring to the phenyl group, the acetyl group on the different sides of ethylenic chain exhibits the properties of a terminal group.

The results of that title molecule in the isolated state have been investigated by the PCILO method and compared with those found from X-ray crystallographic determination. The results indicate that, in this type of forked conjugative series, because of steric hindrance, only one branch of the forking groups is basically coplanar with the conjugated trunk chain and plays the role of a terminal group, while the other one is not coplanar with the conjugated trunk chain and acts as an ordinary substitutent. Referring to the phenyl group, the acetyl group on the different sides of ethylenic chain exhibits the properties of a terminal group.