Fulvalene ylides. A Stevens rearrangement of 1-fluoren-9-ylidene-1,2,5-triphenyl-λ5-phospole
Abstract
quantitative, thermal rearrangement of the title ylide provides the first authentic example of a 1,2-Stevens rearrangement of a phosphorus ylide; the structure of the spiro-1,2-dihydrophosphorinine product has been confirmed by X-ray analysis.