Oxygen Abstraction Reactions of N-Substituted Hydroxamic Acids with Molybdenum(V) and Vanadium(III) and -(IV) Compounds.
A wide range of N-substituted mono- and dihydroxamic acids undergo oxygen abstraction on reaction with V(III), V(IV), and Mo(V) compounds to form hydroxamates of V(V) and Mo(VI) respectively together with the corresponding amides and diamides. The molybdenyl and vanadyl hydroxamates form metal-oxygen clusters under FABMS conditions. The X-ray crystal structures of [MoO(2){CH(3)(CH(2))(n)()C(O)N(C(6)H(5))O}(2) (1 and 2) (n = 4, 5) show monomeric structures with structural trans effects and consequent weakening of the Mo-O(ligand) bonds which may account for the tendency to form clusters in FABMS. In constrast, the electrospray MS of the vanadyl dihydroxamates, VO(OH)[PhN(O)C(O)(CH(2))(n)()C(O)N(O)Ph] (n = 3, 5) and VO(OH)[p-CH(3)C(6)H(4)N(O)C(O) (CH(2))(n)()C(O)N(O)C(6)H(4)-CH(3)) (n = 2, 4) show the presence of dimers in solution.
Brown
David A.
DA
Department of Chemistry, University College, Belfield, Dublin 4, Ireland, Lehrstuhl für Anorganische Chemie 1, Fakultät für Chemie, Universität Bielefeld, Universitätrasse 25, Postfach 8640, 4800 Bielefeld 1, Germany, and Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K.
Bögge
H.
H
Coogan
R.
R
Doocey
D.
D
Kemp
T. J.
TJ
Müller
A.
A
Neumann
B.
B