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On reaction oftBuNHz (I) with Se‐ OClz, at molar ratio 3:1, the seleninylamine (II) is obtained as the first representative of this class of compounds.

The new sulfur diimides S(NPBut2)2 (a) and S(NAsBut2)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 PBut2 and AsBut2 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.**