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Some Reactions of 4H-Pyrylium Salts with Tributylphosphine and with Tertiary Amines
Reynolds, G. A.,Chen, C. H.
, p. 1235 - 1237 (2007/10/02)
The phosphonium salt from tributylphosphine and 2,6-di(4-methoxyphenyl)pyrylium perchlorate (3) reacted with diisopropylethylamine in acetonitrile to give 2,2',6,6'-tetra(4-methoxyphenyl)-Δ4,4'-bi-4H-pyran in quantitative yield.The reaction of 3 and other 4H-pyrylium salts with tertiary amines gave 4H-pyrans.
