The nucleophilic reactivity of organophosphorus compounds. Part 4. The alkylation of phosphorus acid anions with 'onium keten acetals
作者:Alexander T. Zaslona、C. Dennis Hall
DOI:10.1039/p19810003059
日期:——
The preparations of phosphonium and pyridinium ketenacetals are reported and their reactions with a variety of phosphorusacidanions are described. The novel pyridinium ketenacetals are useful reagents for the alkylation of various acidanions in aprotic, aqueous and aqueous-emulsion media.
Neat mixtures of arene/hetarenecarbaldehydes, alkanals as well as alkenals with alkyl (triphenylphosphoranylidene)acetates react exothermally to furnish the corresponding alkenes. In certain cases, heating has to be provided externally. Reaction times are short and yields are generally very high. Neat mixtures of ketones and alkyl (triphenylphosphoranylidene)acetates react preferentially under microwave irradiation. The better stabilized phosphoranes do not react in the solid state with aldehydes or ketones under conventional heating, but necessitate microwave irradiation, although not all of the phosphoranes have been found to be stable under microwave irradiation at 500 W (2450 MHz).
Reaction of nickel polymerization catalysts with carbon monoxide
作者:U. Klabunde、T.H. Tulip、D.C. Roe、S.D. Ittel
DOI:10.1016/0022-328x(87)80045-1
日期:1987.11
The nickel compound, Ni(Ph2PCHC(Ph)O)(PEt3)Ph, is a catalyst precursor for ethylene homopolymerization and the alternating copolymerization of ethylene with carbonmonoxide. In the absence of ethylene, CO is a catalyst poison. In an effort to understand the mechanisms of these reactions, we have investigated the chemistry of the compounds with pure CO. The crystal structures of the catalyst precursor