Uebergangsmetall - Carbin-Komplexe XCIII. Thermodynamisches Gleichgewicht zwischen einem neutralen und einem kationischen Isonitril-substituirten Diethylaminocarbin-Komplex des Wolframs

Article abstract of DOI:10.1016/0022-328X(88)83028-6

The reaction of I(CO)2(t-C4H9NC)2W<*>CNEt2 (I) with t-C4H9NC in n-heptane at 70 deg C leads to an approximately equimolar mixture of neutral, yellow carbyne complex mer-I(t-C4H9NC)3(CO)W<*>CNEt2 (II) and cationic, orange carbyne complex <(t-C4H9NC)4(CO)W<*>CNEt2>⁺I^- (III).In the presence of t-C4H9NC, there is a thermodynamic equilibrium between II and III, which permits the quantitative conversion of II to III in CH2Cl2 at room temperature, and of III to II in toluene at + 70 deg C.The composition and structure of the new complexes II and III were determined by elemental analyses, and from their IR, (1)H NMR, (13)C NMR, and by mass spectra.