Oxidation of the 1-phosphadiene, R2N-PCR-CHCHR (1:R=SiMe3), with Me3SiN3 is accompanied by ring-closure to yield the novel phosphacyclobutene, R2N-HR (2). A structuralisomer of 2 [i.e., R2N-HR(6)] is obtained via the cycloaddition of Me3SiCCH with the (methylene) phosphorane, R2N-P(=NR)=CHR(5). Treatment of 1 with an excess of elemental sulfur affords the disulfide,R2N-R-CHCHR (3), from which removal
1-phosphadiene,R的氧化2的N-PCR-CHCHR(1:R =森达3),与我3的SiN 3是伴随着闭环,得到新颖phosphacyclobutene,R 2 N- HR(2) 。的structuralisomer 2 [即,R 2 N- HR(6)]是通过我的环加成获得的3 SiCCH与(亚甲基)膦,R 2 N-P(= NR)= CHR(5)。用过量的元素
硫处理1可获得二
硫键R 2 N -R-CHCHR(3),从中除去一个
硫原子(具有Ph 3 P)会导致重排成另一个4元环R 2 N- HR(4)。