Intramolecularly C,N-Coordinated Homo- and Heteroleptic Organostannylenes

Abstract

The synthesis of the C,N-chelated homoleptic organotetrylenes (L1)2E (1, E = Sn; 2, E = Pb) and of the tungsten pentacarbonyl complex (L1)2SnW(CO)5 (3), containing the sterically demanding C,N-chelating ligand L1 (L1 = [2-{(C6H3-2,6-Pri2)N═CH}C6H4]−) is reported. In contrast, the use of the C,N-chelated ligand L2 (L2 = [2-{(C6H3-2,6-Pri2)N═C(Me)}C6H2(OCH2O)]−) provided either the homoleptic stannylene (L2)2Sn (4) or the C,N-chelated chlorostannylene (L2)SnCl (5). All attempts to convert the latter into the corresponding ditin compound [L2Sn]2 failed, however, and resulted in the isolation of 4 and elemental tin. These attempts also provided the unprecedented complex [2-{(C6H3-2,6-Pri2)N═C(Me)}C6H2(OCH2O)][2-{(C6H3-2,6-Pri2)NHCH(Me)}C6H2(OCH2O)]Sn (6).