An efficient and practicalarenehydrogenation procedure based on the use of heterogeneous platinum group catalysts has been developed. Rh/C is the most effective catalyst for the hydrogenation of the aromatic ring, which can be conducted in iPrOH under neutral conditions and at ordinary to medium H2 pressures (<10 atm). A variety of arenes such as alkylbenzenes, benzoic acids, pyridines, furans, are
Catalytic hydrogenation of aromatic rings catalyzed by Pd/NiO
作者:Yanan Wang、Xinjiang Cui、Youquan Deng、Feng Shi
DOI:10.1039/c3ra45600e
日期:——
A simple and efficient heterogeneous palladium catalyst was prepared for aromaticringhydrogenation. The catalyst was prepared by a reduction-deposition method and exhibited high activity and selectivity for the hydrogenation of a variety of substituted aromatic compounds to the corresponding cyclohexane and cyclohexanol derivatives with up to 99% yields. The catalyst was characterized by BET, TEM
A new convenient procedure to prepare organomanganese reagents from organic halides and activated manganese
作者:Gérard Cahiez、Arnaud Martin、Thomas Delacroix
DOI:10.1016/s0040-4039(99)01331-3
日期:1999.8
A newmethod to obtain activated manganese metal, especially attractive for large scale preparativeorganicchemistry, is described. The key point is the use of 2-phenylpyridine as electron carrier to reduce manganese chloride by lithium. The active manganese thus obtained was used to prepare various organomanganese reagents from organic halides. The reactivity of these reagents has been studied (acylation
Azo anions in synthesis: α-amino carbanion equivalents from t-butyldiphenyl-methylhydrazones
作者:Jack E. Baldwin、Robert M. Adlington、Ian M. Newington
DOI:10.1039/c39860000176
日期:——
α-Aminocarbanionequivalents (NH2) and α-hydrazino anionequivalents (NHNH2) are readily accessible from the C-alkylation products of t-butyldiphenylmethylhydrazones; these azoalkanes can be efficiently transformed into amines, hydrazines, and also alkanes under mild reaction conditions.
作者:Jack E. Baldwin、Robert M. Adlington、Jeffery C. Bottaro、Jayant N. Kolhe、Ian M. Newington、Matthew W.D. Perry
DOI:10.1016/s0040-4020(01)87648-1
日期:1986.1
The lithium salts of trityl- and diphenyl-4-pyridylmethyl-hydrazones of both aldehydes and ketones react with electrophiles (alkyl halides, aldehydes, ketones, crotonates) at low temperature to form C-trapped azo compounds ; these Intermediates decompose homolytically with loss of nitrogen below room temperature and can be diverted in a synthetically useful way to alkanes, alkenes, alcohols or saturated