REACTIONS OF COORDINATED DINITROGEN .5. REACTIONS OF ETHYL HALOACETATES WITH BIS(DINITROGEN)BIS[1,2-BIS(DIPHENYLPHOSPHINO)ETHANE]MOLYBDENUM

Bis(dinitrogen)bis[l, 2-bis(diphenylphosphino)ethane]molybdenum, Mo(N2)2(dppe)2 (1), where dppe = Ph2PCH2CH2PPh2, reacts with ethyl haloacetates to form ((ethoxycarbonyl)methyl)diazenido complexes of molybdenum, MoX(N2R)(dppe)2, where X = CI, Br, or I and R = CH2COOC2H5. Protonation with fluoroboric acid produces the corresponding hydrazides [MoX(N2HR)(dppe)2]BF4 where the site of protonation is unambiguously established in solution as the carbon-bound nitrogen atom. For comparison, the diazenide and hydrazide derived from the reaction of 1 with ethyl 3-iodoproprionate have been prepared. The effect of the change in coordinated halogen atom and electron-withdrawing ester group on the infrared and 1H NMR spectra will be discussed. © 1979, American Chemical Society. All rights reserved.