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.