2-(2-Methoxy-5,5-dimethyl-2λ5-[1,3,2]dioxaphosphinan-2-ylidene)-3-[(E)-phenylimino]-succinic acid dimethyl ester 生成 10-Methoxy-3,3-dimethyl-7-phenyl-1,5-dioxa-7-aza-6λ
5-phospha-spiro[5.5]undeca-6(11),8-diene-8,9,10,11-tetracarboxylic acid tetramethyl ester