It has been shown by calculation that the dominant factor causing the difference in nT1 of CH and CH2 in vinyl group is its swinv in a plane perpendicular to the chain backbone.

• 乙烯基叔碳的nT_1值大于端碳,经计算表明,引起乙烯基叔、端碳的nT_1值不相等的主要因素是乙烯基在垂直于主链的平面上的摆动。