Topic
Hydrazone
About: Hydrazone is a research topic. Over the lifetime, 4853 publications have been published within this topic receiving 65160 citations. The topic is also known as: hydrazone.
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TL;DR: In this article, a sterically encumbered hydrazone, H10C5N−N═C(C9H14) (NC5H10 = piperidine, C 9H14 = 2-adamantdiyl), was shown to react as active Lewis pairs by their specific donor-acceptor functionality and activate C-H bonds of moderately acidic substrates.
29 citations
TL;DR: In this paper, the authors used Ni(N∧O)2Cl2 with methylaluminoxane (MAO) in toluene for the oligomerization of ethylene.
Abstract: The ethylene oligomerization was investigated by using new hydrazone nickel complexes Ni(N∧O)2Cl2 (2a, N^O=4,5-diazafluorene-9-one-benzoylhydrazone; 2b, N^O=4,5-diazafluorene-9-one-4-nitrobenzoylhydrazone; 2c, N^O=4,5-diazafluorene-9-one-3-nitrobenzoylhydrazone) with methylaluminoxane (MAO) in toluene. Those catalytic systems mainly assisted the dimerization of ethylene with good catalytic activity (105 to 104 g mol−1 h−1) at ambient pressure. The reaction conditions, such as the ratios of Al/Ni, reaction temperature and reaction time, were investigated. The best catalytic activity for the three complexes was observed for complex 2a without nitro-substituent on its aryl ring.
29 citations
TL;DR: In this paper, the authors reveal the origin of stereoselectivity in the deprotonation−alkylation of chiral N-amino cyclic carbamate (ACC) hydrazones.
Abstract: Density functional theory calculations and experiment reveal the origin of stereoselectivity in the deprotonation−alkylation of chiral N-amino cyclic carbamate (ACC) hydrazones. When the ACC is a rigid, camphor-derived carbamate, the two conformations of the azaenolate intermediate differ in energy due to conformational effects within the oxazolidinone ring and steric interactions between the ACC and the azaenolate. An electrophile adds selectively to the less-hindered π-face of the azaenolate. Although it was earlier reported that use of ACC auxiliaries led to α-alkylated ketones with er values of 82:18 to 98:2, B3LYP calculations predict higher stereoselectivity. Direct measurement of the dr of an alkylated hydrazone prior to removal of the auxiliary confirms this prediction; the removal of the auxiliary under the reported conditions can compromise the overall stereoselectivity of the process.
29 citations
TL;DR: In this article, the coordination complexes of acetylferrocene-m-nitrobenzoyl hydrazone (HL) with lanthanide elements, LnL 3 (where Ln = lanthanides), have been prepared by the reaction of HL with the metal(III) chlorides in acetonitrile.
29 citations
TL;DR: In this paper, a new metal complex of 2,6-diacetylpyridine bis(salicyloylhydrazone)(H2daps) has been prepared from the reaction of the hydrazone with Co, Ni, Cu, Zn, and Cd chlorides and acetates.
Abstract: Some new metal complexes of 2,6-diacetylpyridine bis(salicyloylhydrazone)(H2daps) have been prepared from the reaction of the hydrazone with Co, Ni, Cu, Zn, and Cd chlorides and acetates. The chelating behaviour of the hydrazone has been spectroscopically investigated in all compounds by means of i.r. and 1H n.m.r. techniques. The complex [Cd(H2daps)Cl2]·CHCl3·CH3OH has been subject to an X-ray analysis which established a seven-co-ordinate pentagonal-bipyramidal metal environment, with two axial Cl atoms and the H2daps ligand forming the basal plane.
29 citations