1 IntroductionToday,methods to obtain pure enantiomers of organic compounds are of extreme importance,not the least due to the demands imposed on the pharmaceut
1IntroductionThe proton exchange membrane (PEM) is one of key components in fuel cell system. Its properties are very important in determining PEMFC performance
1 Introduction Heteroatom-stabilized carbenium ions have been widely recognized as potential electrophilic reagents. However, in contrast with the extensive wor