If there is a critical angle at phosphorus below which phosphonium salts and phenyl-lithium form pentavalent phosphoranes and above which they form ylides, the angle is bracketed by that in (III) and (Va).
如果在
磷处有一个临界角,在该临界角以下,salts盐和
苯基锂形成五价
磷烷,而在该临界角以上,它们形成叶叉,则该角用(III)和(Va)中的角括起来。