78532-95-3Relevant academic research and scientific papers
Cyclische Doppel-Ylide und ihre korrespondierenden Diphosphonium-triple-ylid-Anionen: Synthese, Struktur und komplexchemisches Verhalten
Schmidbaur, Hubert,Costa, Thomas,Milewski-Mahrla, Beatrix
, p. 1428 - 1441 (2007/10/02)
Bis(dimethylphosphino)- and bis(diphenylphosphino)methane (1a, b) react with 1,2-bis(bromomethyl)benzene to yield cyclic diquaternary phosphonium salts 2a, b, which can be converted into ylidic monosalts 4a, b and double-ylides 3a, b using (CH3)3P = CH2 or KH as a base.According to spectral data, compounds 3a, b are identified as fluxional, unsymmetrical double-ylides, with no evidence for a carbodiphosphorane structure.Hydrolysis leads to an open-chain mono-ylidic phosphane oxide 5, BH3 addition gives the side-on mono-adduct 6.With Zn(CH3)2, however, binuclear 1 : 1 complexes 7a, b are obtained, that are derived from the isomeric carbodiphosphorane form. - The reactions of 3b with LiR, NaNH2, KH, and barium metal (in liquid ammonia) afford (earth)alkaline salts of the corresponding diphosphonium triple-ylide anion (8 - 11).A related cadmium complex 12 is generated from 3b and Cd(CH3)2 with evolution of methane.The crystal structure of 12 is determined.
