Novel elimination of hydroxylamine and formation of a nickel tetramer on reactions of glutarodihydroxamic acid with model dinickel hydrolases‡
作者:David A. Brown、Laurence P. Cuffe、Noel J. Fitzpatrick、William K. Glass、Kara Herlihy、Hassan Nimir、Oliver Deeg、William Errington、Terence J. Kemp
DOI:10.1039/a806911e
日期:——
Reactions of glutarodihydroxamic acid with the hydrolase enzyme urease models, [Ni2(µ-H2O)(OAc)4(tmen)2] and [Ni2(OAc)3(urea)(tmen)2][OTf], lead to novel hydroxylamine elimination and formation of [Ni2(OAc)2µ-O(N)(OC)2(CH2)3}(tmen)2][OTf] and the tetramer [Ni4(OAc)2(gluA2)2(tmen)4][OTf]2, respectively, both of which are structurally characterised by X-ray crystallography.
Conformational behaviour of hydroxamic acids: ab initio and structural studies
作者:David A. Brown、Raymond A. Coogan、Noel J. Fitzpatrick、William K. Glass、Dau E. Abukshima、Loreto Shiels、Markku Ahlgrén、Kimmo Smolander、Tuula T. Pakkanen、Tapani A. Pakkanen、Mikael Peräkylä
DOI:10.1039/p29960002673
日期:——
The conformational behaviour of a series of monohydroxamic acids, p-RC(6)H(4)CONR'OH (R = Me, R' = H, Me; R = MeO, R' = H, Me; R = NO2, R' = H), and a series of dihydroxamic acids, (CH2)(n)(CONR'OH)(2) (n = 3-8, 10, R' = H and n = 7, R' = Me), in methanol, DMSO and chloroform and in the solid state has been examined using IR and NMR spectroscopy, X-Ray crystal structure determinations of p-MeC(6)H(4)CONMeOH and the monohydrate of glutarodihydroxamic acid (n = 3) together with ab initio molecular orbital calculations for several hydrated and unhydrated hydroxamic acids have been performed. Hydrogen bonding effects are shown to be important in both the solid state and solution, The cis(Z) conformation of the hydroxamate group(s) (CONHOH) is preferentially stabilized by hydrogen bonding with water molecules.
Brown, D. A.; Geraty, R. A.; Glennon, J. D., Synthetic Communications, 1985, vol. 15, # 13, p. 1159 - 1164
作者:Brown, D. A.、Geraty, R. A.、Glennon, J. D.、Choileain, N. Ni