Δ1.2-1-triemthylsilyloxy-3-methyl-3-vinylcyclohexene 、
5-[1,3]Dioxolan-2-yl-2,6,6-trimethyl-cyclohex-1-enecarboxylic acid methyl ester 在
对甲苯磺酸 四氯化钛 作用下,
生成 2,6,6-Trimethyl-5-[2-methyl-6-oxo-2-vinyl-cyclohex-(E)-ylidenemethyl]-cyclohex-1-enecarboxylic acid methyl ester 、 2,6,6-Trimethyl-5-[2-methyl-6-oxo-2-vinyl-cyclohex-(Z)-ylidenemethyl]-cyclohex-1-enecarboxylic acid methyl ester