The molybdenum(VI) complex (Ar'N)2MoCl2. THF (Ar' = 2,6-diisopropylphenyl) was prepared by reaction of MoO2Cl2 With Ar'NCO at 70-degrees-C in THF. The preparations of the derivatives Mo(NAr')2Np2, Mo(NAr')2Mes2, Mo(NAr')2MesBr, Mo(NAr')2(NEt2)Cl, and Mo(NAr')2NEt2)2 from Mo(NAr')2Cl2.THF are described. In addition, the complex Mo(NAr')2(NHAr')2 has been synthesized and characterized crystallographically. Crystal data: MoC48H70N4, M(r) = 799.06, monoclinic, P2(1)/n, a = 9.874 (3) angstrom, b = 24.004 (8) angstrom, c = 19.220 (7) angstrom, beta = 93.34 (2) angstrom, V = 4547 angstrom 3, Z = 4, rho-calc = 1.167 g cm-3, lambda = 1.5418 angstrom, mu-A = 26.35 cm-1, T = -100-degrees-C, R = 4.22% for 4426 unique observed [I greater-than-or-equal-to 3-sigma-(I)] reflections, R(w) = 7.65%.