Intramolecularly C,N-Coordinated Homo- and Heteroleptic Organostannylenes

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).