The phosphaalkene-phosphenium cations (R2N)2C=P-P+-NR′2 a route towards diphosphenes and phosphaallylic cations
摘要:
Phosphaalkene-phosphenium cations (R2N)2C = P-P+-NR'2 4a,b have been generated by halide abstraction from the corresponding chlorophosphines 2a,b or direct condensation of phosphaalkenes (R2N)2C = P-SiMe3 1 with chlorophosphenium cation 3a. The fast valence isomerization of 4a,b towards diphosphenes 5a,b and the unexpected formation of 2-phosphaallylic salts 7a,d via 1,3-tetraalkylformamidinium substituted cyclotetraphosphanes 6a,d have been observed.