A Facile Synthesis of 2,4-Dialkoxy-, 2-Alkoxy-4-phenoxy- and 2,4-Diphenoxy-6-trifluoromethyl-3,4-dihydro-2 H -pyrans. Hetero-Diels-Alder Reactions of trans -β-Trifluoroacetylvinyl Ethers with Various Vinyl Ethers

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