Enone structure as a probe to Lewis acid carbonyl binding in copper-catalysed asymmetric conjugate addition
摘要:
Systematic changes in the substitution pattern of linear enones ((RCOCH)-C-1=CHR2) helps identify the reactive conformation (s-trans versus s-cis) of the enone in copper-catalysed asymmetric 1,4-ZnEt2 addition. Pointers to the binding mode of the Lewis Acid (syn or anti to the 'ene' function) are also gathered. Enantioselectivities of up to 79% have been realised in these reactions. (C) 2000 Elsevier Science Ltd. All rights reserved.
Carbon monoxide solubility in ionic liquids: determination, prediction and relevance to hydroformylationElectronic supplementary information (ESI) available: further experimental details. See http://www.rsc.org/suppdata/cc/b4/b401537a/
作者:C. Andr� Ohlin、Paul J. Dyson、G�bor Laurenczy
DOI:10.1039/b401537a
日期:——
The solubility of carbonmonoxide in 37 ionic liquids and in some organic solvents has been determined using high-pressure (13)C NMR spectroscopy; a method for predicting the CO solubility is demonstrated, and it was shown that the rate of the hydroformylation of 5-hexen-2-one does not correlate with the CO solubility, as expected from the determined relative solubility of CO compared to H(2).