Supported ionic liquids. New recyclable materials for the L-proline-catalyzed aldol reaction
作者： Michelangelo Gruttadauria , Serena Riela , Carmela Aprile , Paolo Lo Meo , Francesca D'Anna
关键词: Aldol reaction 、 Organic chemistry 、 Adsorption 、 Acetone 、 Ionic liquid 、 Inorganic chemistry 、 Catalysis 、 Chemistry 、 Silica gel 、 Filtration 、 Monolayer
摘要: New materials for L-proline recycling have been developed. These applied to the L-proline-catalyzed aldol reaction between acetone and several aldehydes. The has supported on surface of modified silica gels with a monolayer covalently attached ionic liquid or without additional adsorbed liquid. Good yields ee values, comparable those obtained under homogeneous conditions, especially imidazolinium-modified 4-methylpyridinium-modified gels. Moreover, these easily recovered by simple filtration studies about their reuse carried out. showed that can be used at least up seven times. Finally, in case gel, investigations this support regenerated giving again recyclable material high isolated reproducible values 13 cycles.
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