Theory predicts that electron donors have larger outward rotation preferences than acceptors in thermal ring openings of cyclobutenes. Experimental verifications are presented for several 3,3-disubstituted cyclobutenes.
理论预测,在
环丁烯的热环开口中,电子给体比受体具有更大的向外旋转偏好。实验证明了几种3,3-二取代的
环丁烯。