Role of water and phase transfer catalysts in the kinetics of condensation of diaryl ketones with acetonitrile initiated by solid potassium hydroxide †
作者:T. William Bentley、Ray V. H. Jones、Annette H. Larder、Stephen J. Lock
DOI:10.1039/a704763k
日期:——
derivatives with acetonitrile in the presence of excess solid potassium hydroxide (KOH) to give 2,2-diarylacrylonitriles are reported. Reaction rates are strongly temperature dependent, and water, other cosolvents and quaternary ammonium salts all accelerate the reaction; also variation in substituents at one of the para-positions (from H to Cl, F and Me) gives a significant rateeffect (ρ = 1.9). In
Palladated Kaiser Oxime Resin as Precatalyst for the Heck Reaction in Organic and Aqueous Media
作者:Carmen Nájera、Emilio Alacid
DOI:10.1055/s-2006-951521
日期:2006.11
A particular Kaiser oxime resin derived palladacycle is an efficient precatalyst for the Heck reaction with aryl iodides and bromides in DMF and in aqueous solvents under relatively moderate temperatures (110 °C and 120 °C) and high TON up to 105. Poisoning studies indicate that this polymer acts as a precatalyst. The polymer has been reused after recycling with low to moderate leaching of Pd(0).