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1,1,1,3,3,3-Hexafluoro-2-propanol (HFIP) is described as an excellent solvent for those Diels–Alder reactions in which Lewis-acid-sensitive reagents are used, leading to high yields with good regio- and endo/exo selectivities under very mild conditions.
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Cativiela et al. (1994) studied this question.
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