Cationic Palladium(II), Platinum(II), and Rhodium(I) Complexes as Acetalisation Catalysts
作者:Fabrizio Gorla、Luigi M. Venanzi
DOI:10.1002/hlca.19900730317
日期:1990.5.2
The use of [Pd(H2O)2(Ph2PCH2CH2PPh2)] (CF3SO3)2 as a catalyst for the acetalisation of a variety of aldehydes and ketones and for trans-acetalisation is described. It is also shown that Pt(H2O)2(PH2PCH2CH2PPh2) (CF3SO3)2 is at least as effective as the corresponding Pd compound, while much lower reaction rates are observed with [Rh(MeOH)2(Ph2PCH2CH2PPh2)] [BF4].
Homolytic reactions of ligated boranes. Part 18. The scope of enantioselective hydrogen-atom abstraction by chiral amine–boryl radicals for kinetic resolution under conditions of polarity reversal catalysis
作者:Hai-Shan Dang、Valérie Diart、Brian P. Roberts
DOI:10.1039/p19940001033
日期:——
carbonyl-containing compounds. The key step involves enantioselective abstraction of hydrogen from a C–H bond α to the carbonyl function by optically active amine–boryl radicals derived from the catalyst by hydrogen-atom transfer to tert-butoxyl radicals generated by photolysis of di-tert-butyl peroxide. Chiral discrimination is generally not large, although enantioselectivity factors up to 8.8 were obtained at