Bis[bis(dimethylamino)phosphino]acetylene (2a) and two molecules of dimethyl- and diethyl-acetylenedicarboxylate (1a /1b ) react in a criss-cross-cycloaddition to yield 1λ5 ,4λ5- diphosphapentalenes (3), which react further with 1 to yield a 1λ5 ,4λ5-diphosphaazulenes (5). A mechanism of both reactions is proposed. The reaction of 1λ5,4λ5-diphosphaazulene with 1a at high pressure yields 1,1,4,4-te
双[双(
二甲氨基)膦基]
乙炔 (2a) 和两个分子的二甲
乙炔二
甲酸和二
乙炔二
甲酸 (1a /1b ) 以交叉环加成反应生成 1λ5 ,4λ5-二
磷戊烯 (3),其进一步与1 产生 1λ5 ,4λ5-diphosphaazulenes (5)。提出了两种反应的机理。1λ5,4λ5-diphosphaazulene 与 1a 在高压下反应生成 1,1,4,4-四(
二甲氨基)-3,5,6,7,8-五(甲氧基羰基)-2-[1,2,2tris (甲氧基羰基)
乙烯基]-1λ5,4λ5-二
磷茚(7)。双(
二苯基膦基)
乙炔 (2c) 与 1a 反应生成 1,5a-二氢-1-甲氧基-(1-甲氧基羰基
乙炔)-3,3,7,7-四苯基)-2-oxa-3λ5,7λ5-diphosphacyclopenta [1,2,3-c,d]azulene-4,5,5a,6,8,9-hexakis(甲氧基羰基) (9) 和 4-(二苯基
磷酰基)-5-[1