Abstract
The one-step epoxidation of allyl chloride has always been a great challenge for the industrial production. The key of this technology is to find efficient and friendly catalyst. In this paper, three structurally related quaternary ammonium modified polyoxophosphotungstates were synthesized by green and facile method. Among them, [C16H33(CH3)3N]3PW4O24 and [π-C5H5NC16H33]3PW4O24 are reaction-controlled phase transfer catalyst (RPTC) and [(C18H37)2(CH3)2N]3PW4O24 is temperature-controlled phase transfer catalyst (TPTC). All three catalysts could achieve the epoxidation of allyl chloride with equimolar H2O2 under solvent-free and mild conditions. Moreover, the catalysts exhibited excellent catalytic performance and reusability. The catalytic mechanism was explored by FT-IR spectroscopy. The results of kinetic experiments show that the chain length of alkanes and heterocyclic structure of cations have a great influence on the catalytic activity of the catalysts.
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