| 摘要 |
The present invention relates to supported heterogeneous organotin catalysts, particularly this invention relates to a process for the preparation of supported organotin catalysts, polymer-supported organotin catalysts for esterification and transesterification reactions and a process for conducting esterification or transesterification reactions. The supported heterogeneous organotin catalysts is defined by formula X1 to X3: <CHEM> wherein Z = a spacer group -(CH2)m- with Y being an insoluble phenyl-group containing copolymer such as acrylnitril-butadien-styrene copolymer, polystyrene-based copolymer, methyl methacrylate-butadien-styrene copolymer, polyphenylenether (co)polymer, polyethylene terephthalate, polyphenylen sulfide, polyurethane or polyamide, in particularly crosslinked polystyrene polymers, cross linked by ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, divinyl toluene or trivinyl benzene.
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