Reaktionen koordinierter Liganden, IV [1] Cyclotriphosphankomplexe (RP)3[Cr(CO)5]m (m = 1, 2, 3) durch Dehalogenierung von RPBr2Cr(CO)5 mit Magnesium / Reactions of Coordinated Ligands, IV [1]. Cyclotriphosphane Complexes (RP)3[Cr(CO)5]m (m = 1, 2, 3) by Dehalogenation of RPBr2Cr(CO)5 with Magnesium

Compounds RPBr₂Cr(CO)₅ (R = Me, Et, i-Pr. t-Bu, c-Hex. (-)Menthyl. Ph) and RPBr₂W(CO)₅ (R = (-)Menthyl, Ph) are obtained from M(CO)₅THF and organodibromophosphane. Dehalogenation of the chromium complexes with magnesium in THF leads to (RP)₃[Cr(CO)₅]m (m = 1. 2, 3) with m depending on the bulkiness of R. When dissolved in THF the binuclear complexes (m = 2) are gradually converted into mononuclear compounds. The isomeric structure of the cyclotriphosphane complexes is deduced from their ³¹P{¹H} NMR spectra.