73 The Photochemical Irradiation of R3GEH in the Presence of [(C5H5)Fe(CO)2CH3] in DMF Leads to Digermoxanes

Wednesday, November 4, 2009: 11:00 AM
Angus (Camino Real Hotel)
Griselda A. Lopez , Department of Chemistry, University of Texas at El Paso, El Paso, TX
Renzo Arias , Department of Chemistry, University of Texas at El Paso, El Paso, TX
Hemant Sharma , Department of Chemistry, University of Texas at El Paso, El Paso, TX
Keith H. Pannell , Department of Chemistry, University of Texas at El Paso, El Paso, TX
We have recently reported that iron-catalyzed photochemical reactions of hydrosilanes yield disiloxanes when using DMF as the solvent. We are studying the capacity for a similar reaction using hydrogermanes. The photochemical treatment  of Et3GeH in a mixture of dry DMF/benzene in the presence of the title catalyst did indeed result in the formation of  hexaethyldigermoxane, Et3GeOGeEt3, i.e.  there is an oxygen transfer from DMF. Trimethylamine is the other product from such reactions. The experiments were followed by 13C NMR and GC(LC)-MS. This finding is interesting because it illustrates the similarity of organogermanes to organosilanes, i.e. both form E-O-E compounds. However, under similar conditions the reaction of related hydrostannanes leads to theofrmation of distannanes, i.e. compounds with a direct Sn-Sn bond, illustrating an entertaining periodic variation.