Abstract
Abstract The reaction of CF3CHO with dienes using ZnX2 (X: Cl, OTf) in organic solvents (CH2Cl2 or CH3NO2) gave fairly good results in depressing unfavorable reactions and affording the preferential formation of the ene reaction products, 1-trifluoromethyl-3-buten-1-ols, together with the Diels–Alder reaction products. Particularly, Zn(OTf)2, which is insoluble in CH2Cl2, had some predominance for the formation of ene-type products in preference to ZnCl2, and could be recycled without any deterioration in its catalytic activity.
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