4a-methyl-5,6,7,8-tetrahydro-2(4aH)-naphthalenone 、
1,3-丁二烯 在
三氯化铝 作用下,
生成
10β-methyl-4aα,10α-tetramethylene-1,4,4a,5,8,8aα,9aα,10aβ-octahydro-9-anthrone 、 4β-methyl-4α,4aα-tetramethylene-4,4a,5,8-tetrahydro-1-(8aαH)-naphthalenone 、 4aβ-methyl-1,2,3,4,4a,4bβ,5,8-octahydro-9(8aαH)-phenanthrenone 、 4aβ-methyl-1,2,3,4,4a,4bβ,5,8-octahydro-9(8aβH)-phenanthrenone