Transesterification of diethyl oxalate with phenol over sol-gel MoO(3)/TiO(2) catalysts.

Transesterification of diethyl oxalate with phenol over sol-gel MoO(3)/TiO(2) catalysts.

ChemSusChem (2012-07-24)

Trupti Kotbagi, Duy Luan Nguyen, Christine Lancelot, Carole Lamonier, Kaew-Arpha Thavornprasert, Zhu Wenli, Mickaël Capron, Louise Jalowiecki-Duhamel, Shubhangi Umbarkar, Mohan Dongare, Franck Dumeignil

PMID22821928

摘要

The transesterification of diethyl oxalate (DEO) with phenol to form diphenyl oxalate (DPO) has been carried out in the liquid phase over very efficient MoO(3)/TiO(2) solid-acid sol-gel catalysts. A selectivity of 100 % with a remarkable maximum yield of 88 % were obtained, which opens the route to downstream phosgene-free processes for the synthesis of polycarbonates. Interpretation of the results of various acidity measurements (NH(3) and pyridine desorption, methanol oxidation as a probe reaction) allowed us to identify the catalytic sites as Lewis acid sites.

材料

产品编号

品牌

产品描述

267856

Sigma-Aldrich

氧化钼(VI), ACS reagent, ≥99.5%

203815

Sigma-Aldrich

氧化钼(VI), 99.97% trace metals basis

M0753

Sigma-Aldrich

氧化钼(VI), ReagentPlus^®, ≥99.5%

775703

Sigma-Aldrich

氧化钼(VI), nanopowder, 100 nm (TEM), 99.5% trace metals basis

69850

Sigma-Aldrich

氧化钼(VI), puriss. p.a., 99.5%