The photochemical conversion of protonated durene in fluorosulphuric acid into a bicyclo[3,1,0]hexenyl cation has been shown to proceed by a symmetry-allowed distrotatory closure rather than by a [σ2a+π2a]cycloaddition reaction.
在fluorosulphuric酸质子化
杜烯为二环的光
化学转化[3,1,0]己烯基阳离子已显示通过对称性允许distrotatory闭合,而不是由一个[σ2进行一个+ π 2一]环加成反应。