On the effect of cyclodextrin on the Z/E-selectivity of Wittig Reactions with semistabilized ylides
作者:Gunnar Westman、Olof Wennerström、Ilona Raston
DOI:10.1016/s0040-4020(01)80315-x
日期:1993.1
The Z/E-selectivity of Wittigreactions between semistabilized ylids and aromatic aldehydes is affected by the addition of host molecules such as cyclodextrins (CD). An increase in the Z-selectivity from 57 to 92% has been reached with DMF as solvent and an increase in the E-selectivity from 67 to 80% has been reached with ethanol as solvent for the same Wittigreaction. Reactions with arenes with bulky
The reductive charging–discharging behaviour of several newly synthesized soluble oligo-p-phenylene-vinylenes was studied by cyclic voltammetry; the results show that both the number of redox states and the magnitude of their energetic interaction depend on the chain length of the corresponding oligomer.