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Org. Chem.<\/i>, 45<\/b>, 1066\u20131081 (1980).","DOI":"10.1021\/jo01294a030"},{"key":"22","unstructured":"22) Since the pK<\/i>a<\/sub> of the second proton of (S<\/i>)-3a<\/b> is estimated to be about 13, lithium tert<\/i>-butoxide is a strong enough base to deprotonate (S<\/i>)-3a<\/b> to form lithium binaphtholate (S<\/i>)-4a<\/b> in the reaction mixture. However, it is probable that various lithium species such as (S<\/i>)-4a<\/b>, lithium tert<\/i>-butoxide and monolithium binaphtholate are formed by equilibrium."},{"key":"23","unstructured":"23) Under the same reaction conditions, the retro-Michael reaction from 5aa<\/b> did not occur, suggesting that the formation of product 5aa<\/b> from complex A<\/b> proceeds by an exergonic process."},{"key":"24","doi-asserted-by":"crossref","unstructured":"24) Zhao Y., Truhlar D. G., Theor. Chem. 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