• Bulletin of the Korean Chemical Society
• /
• v.33 no.9
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• pp.3083-3086
• /
• 2012

• Bulletin of the Korean Chemical Society
• /
• v.32 no.1
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• pp.341-343
• /
• 2011

• Bulletin of the Korean Chemical Society
• /
• v.19 no.4
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• pp.475-481
• /
• 1998

Details of various equilibria involved in the reactions of oxaza- and thiazazincolidine catalysts, generated from either β-amino alcohol or β-amino thiol, with aldehyde were studied by colligative measurements. The results indicated that the coordination of diethylzinc prior to the coordination of aldehyde is essential for high enantioselectivity of the thiol catalyzed reaction. The probable origin of asymmetric nonlinearity is also presented.