Comparative experiments show that ultrasonic irradiation reduces thereaction times and improves the yields in the di-alkylation and cyclo-di-alkylationof ethyl
Enantiomers of a-substituted-(2-pyridyl)-methylarfdnes uere separated on SC-7 gas chromatograph with a 20m×0.25mm Chirasil-Val capIlary column,Carrier gas