| This thesis is focused on three areas: (i) the reactivities of bisgermavinylidene; (ii) the synthesis of Group 14 metal pyridyl-1-azaallyl compounds and (iii) the reactivities of pyridyl-1-azaallylgermanium(II) chloride.; Chapter 1 describes the reactivities of bisgermavinylidene [(Me 3SiN=PPh2)2C=Ge→Ge=C(PPh2=NSiMe 3)2] (17) prepared from the reaction of [HC(PPh 2=NSiMe3)2GeCl] (19) with [Ge{lcub}N(SiMe 3)2{rcub}2]. Treatment of 17 with M(CO) 5(THF) (M = Cr, Mo, W) affords metallagermacyclopropane [(Me3SiN=PPh 2)2CGeM(CO)3{lcub}M(CO)5{rcub}] (M = Cr ( 22), Mo (23), W (24)); in one of the reactions, compound 23 reacts further to give a “pincer” carbene complex [(CO)3Mo{lcub}C(Ph2P=NSiMe3)2{rcub}] (25). Compound 17 reacts with Group 10 transition metal complexes to give Group 10 metal-germavinylidene complexes [(Me 3SiN=PPh2)2C=Ge→Ni←C(PPh2=NSiMe 3)2] (26), [{lcub}(Me3SiN=PPh2) 2C=Ge{rcub}2→Ni(PPh3)2] (28) and [{lcub}(Me3SiN=PPh2)2C=Ge-μ2{rcub}Pd(PPh 3)]2 (29). The reaction of 17 with elemental chalcogens affords chalcogen-bridged dimers of germaketene analogues [(Me3SiN=PPh2)2C=Ge(μ-E)]2 (E = S (32), Se (33) and Te (34)). In addition, compound 17 reacts with Group 13 metal halides to give [HC(PPh2=NSiMe3)2AlCl2] ( 35) and [(Me3SiN=PPh2)2C(GeCl)Ge(μ-Cl)] 2 (36). In contrast, treatment of 17 with Group 14 metal halides affords [H2C(PPh2=Cl)(MCl2){rcub}] (M = Ge (37), Sn (38)). Bisgermavinylidene 17 reacts with benzil to give {lcub}(Me3SiN = Ph2P)2C{rcub} (39).; Chapter 2 deals with the preparation and characterization of Group 14 metal pyridyl-1-azaallyl complexes. The lithium pyridyl-1-azaallyl compound -2){rcub}]2 (R = SiMe3 (50), H ( 51)) reacts with Group 14 metal halides under different conditions affording -2){rcub}] (59), |
