Stable Compounds of Composition LGe(II)R (R = OH, PhO, C6F5O, PhCO2) Prepared by Nucleophilic Addition Reactions

Abstract

The stable beta-diketiminate germanium(II) compounds LGeR [L = HC(CMeNAr)(2), Ar = 2,6-iPr(2)C(6)H(3)] (R = OTf, OH, PhO, C6F5O, PhCO2) are described. LGeOTf (2) is synthesized by salt metathesis reaction of LGeCl (1) with AgOTf and can be isolated as colorless crystals in 90% yield. Compound L'Ge (3) (L' = CH{(C=CH2)(CMe)(2,6-iPr(2)C(6)H(3)N)(2)}) was obtained by treatment of LGeOTf (2) with 1 equiv of 1,3-di-tert-butylimidazol-2-ylidene (NHC) in toluene. Reaction of 3 with H2O, PhOH, C6F5OH, and PhCO2H, respectively, in toluene provided the germanium(II) compounds 4-7 in high yield. Compounds 2-7 were characterized by microanalysis and multinuclear NMR spectroscopy. Furthermore compounds 5, 6, and 7 are confirmed by X-ray structural analysis with the result that compounds 5, 6, and 7 are monomeric and the germanium center resides in a trigonal-pyramidal environment.