Reaction of N-aryl-beta -amino alcohols with p-toluenesulphonyl chloride un
der phase transfer catalytic condition gave the corresponding N-aryl azirid
ines in good yields, whereas N-alkyl-beta -amino alcohol [for e.g., L-ephed
rine] gave the corresponding N-tosyl derivative as the major product, along
with the expected N-alkyl aziridines in lower yield.