Die Addukte von Bis(di-tert-butylphosphino)- und Bis(di-tertJ-butylarsino)schwefeldiimid mit Cyclopentadienyl-hydridometall- Komplexen CpM(CO)3H (M = Cr, Mo, W) / The Adducts of Bis(di-tert-butylphosphino)- and Bis(di-tert-butylarsino) Sulfur Diimides with Cyclopentadienyl Hydridometal Complexes CpM(CO)3H (M = Cr, Mo, W)

Abstract

The new sulfur diimides S(NPBut 2)2 (a) and S(NAsBut 2)2 (b) react with the hydrido- metal complexes CpM(CO)3H (M = Cr (1), Mo (2), and W (3)) to give 1:1 adducts which contain a three-electron acyl-chelate ligand. Only one of the two PBut 2 and AsBut 2 sub­stituents, respectively, becomes coordinated to the metal; the hydrido ligand of the starting complex (CpM(CO)3H (1-3) is transfered to a N atom of the sulfur diimide system. The structures of the adducts (1a-3a and 1b-3b) are discussed on the basis of their infrared and 1H, 13C, and 31P NMR spectra. The X-ray analysis of 3a confirms the presence of a four-membered metallocycle containing W, C(acyl), N, and P.**