At high temperature and in the presence of phosphoric acid, the alkyl group is fractured into the corresponding olefine, according to which the alkyl of long-chain aliphatic amine can be identified.

• 在高温和磷酸存在下，脂肪胺中的烷基裂解为相应的烯烃，以此可鉴定脂肪胺的烷基链长。