Co-ordinated cyclo-tetraphosphosxane and cyclo-pentaphosphoxane; two configurations of the co-ordinated P4O4 ring

Abstract

Thermal reactions of hexacarbonyl-chromium or -tungsten with bis(di-isopropylamino)phosphine oxide or photolysis of Mo(CO)₆ with [Prⁱ₂NPO]₃ afforded cis-M(CO)₄[Prⁱ₂NPO]₄, which contains both chair–boat and chair–chair forms of the co-ordinated P₄O₄ ring in solution as well as in the molecular structure; additional products of the chromium reactoin include the chromium cage complex, Cr₂(CO)₈[Prⁱ₂NPO]₄, and Cr₂(CO)₇[Prⁱ₂NPO]₅ which contains the novel cyclo-pentaphosphoxane P₅O₅ ring co-ordinated to one cis-Cr(CO)₄ and one fac-Cr(CO)₃ moiety.