Intramolecular [4+2] versus [2+2] cycloadditions in P–X–P-linked biphospholes (X = O, S)
作者:Matthew P. Duffy、Yuhan Lin、Liow Yu Ting、François Mathey
DOI:10.1039/c1nj20087a
日期:——
Under solar light at room temperature, the tungstenpentacarbonylcomplex of the P–S–P-linked biphosphole (6) undergoes a [2+2] intramolecular cycloaddition. Then, this [2+2] dimer (7) gives the original [4+4] dimer (8) via a Coperearrangement. This sequence stands in sharp contrast with the behavior of the corresponding P–O–P-linked biphosphole (2) which undergoes a classical [4+2] cycloaddition