Lineare Oligophosphaalkane, XXV. Synthese von Ph2PCH2PH2 und (ph2PCH2)2PH durch Phosphinomethylierung von PH3 unter Phasentransferkatalyse

Abstract

Linear Oligophosphaalkanes, XXV1. – Synthesis of Ph2PCH2PH2 and (Ph2PCH2)2PH by Phosphinomethylation of PH3 with Phase‐Transfer CatalysisAlkylation of Ph2PH with CH2Cl2 under phase‐transfer conditions in the system dichloromethane/toluene/water affords Ph2P‐CH2Cl in high yields. Depending on the reaction conditions employed Ph2P‐CH2Cl reacts with PH3 in the two phase system under phase‐transfer catalysis (nBu4NCl) to yield the tertiary‐primary methylenebis(phosphane) Ph2P‐CH2‐Ph2 (2) or the PH functional triphosphaalkane Ph2P‐CH2‐PH‐CH2‐PPh2 (3), respectively. Metallation of 2 and 3 with RLi (R = nBu, tBu) and subsequent reaction with Me3siCl yields the silyl derivatives 2e and 3b, respectively. The analysis of the 1H‐ 13C‐ and 31P‐NMR spectra is reported.