C,N‐chelated organotin(IV) compounds as catalysts for transesterification and derivatization of dialkyl carbonates

作者: Tomáš Weidlich , Libor Dušek , Barbora Vystrčilová , Aleš Eisner , Petr Švec

DOI: 10.1002/AOC.2858

关键词:

摘要: The potential catalytic activity of selected C,N-chelated organotin(IV) compounds (e.g. halides and trifluoroacetates) for derivatization both dimethyl carbonate (DMC) diethyl (DEC) was investigated. Some tri-, di- monoorganotin(IV) species (LCN(n-Bu)2SnCl (1), LCN(n-Bu)2SnCl.HCl (1a), LCN(n-Bu)2SnI (2), LCNPh2SnCl (3), LCNPh2SnI (4), LCN(n-Bu)SnCl2 (5), LCNSnBr3 (6) [LCNSn(OC(O)CF3)]2(μ-O)(μ-OC(O)CF3)2 (7)) bearing the LCN moiety (LCN = 2-(N,N-dimethylaminomethyl)phenyl-) were assessed as catalysts reactions DMC DEC with various substituted anilines. activities 4 7 p-substituted phenols studied comparison standard base K2CO3/Silcarbon K835 catalyst (catalyst 8). composition resulting reaction mixtures monitored by multinuclear NMR spectroscopy, GC GC-MS techniques. In general, 1, 3 exhibited highest all studied, while some them yielded selectively carbonates, carbamates, lactam or urea. Copyright © 2012 John Wiley & Sons, Ltd.

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