CH(2)Cl(2) at 110 degrees C under 30 atm CO for 18 h afforded a 5.5.6 tricyclic enone in high yields. For unsymmetrical dienes such as 2-methyl-1,3-butadiene, 2-methyl-1, 3-pentadiene, and 3-methyl-1,3-pentadiene, two separable regioisomers were obtained. The catalytic reactions described are experimentally quite simple and provide a very useful synthetic procedure for the syntheses of [5.5.6] tricyclic
用Co(2)(CO)(8)(5 mol)处理1,7
-二苯基-1,6-庚二炔和对称
丁二烯,例如
2,3-二甲基-1,3-丁二烯和
1,3-环己二烯在110°C下,在30个大气压的CO下于CH(2)Cl(2)中溶解18%的氢,以高收率提供了5.5.6
三环烯酮。对于不对称二烯,例如2-甲基-
1,3-丁二烯,2-甲基-1、3-
戊二烯和
3-甲基-1,3-戊二烯,获得了两种可分离的区域异构体。所描述的催化反应在实验上非常简单,并为[5.5.6]
三环烯酮的合成提供了非常有用的合成方法。