Chemistry Letters p. 1225 - 1228 (1982)
Update date:2022-08-24
Topics:
Yamamoto, Keiji
Watanabe, Hiroyuki
Phosphorus pentoxide reacts readily with anhydrous hexamethyl-disiloxane (HMDSO) to form mixtures of tetraphosphoric acid trimethyl-silyl esters (so-called PPSE), the composition of which being estimated from (31)P NMR data.PPSE was conveniently used as a condensation reagent for the syntheses of benzimidazoles, indoles, and isoquinoline derivatives.Heterogenized PPSE by using silica gel instead of HMDSO was found to be equally useful.
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