Reaction of Tp’(CO)(3)WH (Tp’ = hydridotris(3,5-dimethyl-1-pyrazolyl)borate) with tosyl azide in THF at reflux affords the amido complex Tp’(CO)(2)W(N(H)Ts) (1). Crystals of 1 are monoclinic, space group P2(1)/n, with cell parameters a = 12.4855(11) Angstrom, b = 20.5976(16) Angstrom, c = 12.7311(11) Angstrom, beta = 96.510(10)degrees, V = 3253.0(5) Angstrom(3) and D-calcd = 1.591 g cm(-3) for Z = 4. Least-squares refinement led to final R and R(w) values of 0.038 and 0.046, respectively. Complex 1. undergoes oxidation by silver triflate or iodine to give the imido complexes [Tp’(CO)(2)W(NTs)]X (X = OTf, 2a; X = I-3, 2b). The single crystal X-ray structure of 2b is also reported (orthorhombic, space group Pcab, a = 15.1764(16) Angstrom, b = 16.8890(14) Angstrom, c = 26.909(3) Angstrom, V = 6897.2(13) Angstrom(3), and D-calcd = 2.094 g cm(-3) for Z = 8; R = 0.044, R(w) = 0.052). The cationic nitrene complex 2 reacts with LiBH4 to regenerate the amido compound 1. Addition of trimethylphosphine to solutions of 2 leads to the formation of three species : the phosphinimine TsN=PMe(3) (3) and two tungsten complexes, [Tp’(CO)(2)W(PMe(3))(2)] [X] (X = OTf, 4a; X = I-3, 4b) and [Tp’(CO)(PMe(3))W(NTs)][X] (X = OTf, 5a; X = I-3, 5b). Complex 5b undergoes substitution by iodide to produce the tungsten monocarbonyl Tp’(CO)IW(NTs) (6).