Silica-based substrates modified by grafting of polyalkylguanidinium groups, their process of manufacture and their use as catalysts
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United States of America Patent
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Sep 20, 1994
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app pub date -
Nov 30, 1992
filing date -
Nov 29, 1991
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Abstract
Silica-based substrate surface-modified by grafting covalent links of organic polysubstituted guanidinium groups, and preferably polyakylguanidinium groups. These substrates can be obtained by reacting silica with a polyalkylguanidinium anion, the silanol residual groups of silica being optionally treated with hexamethyldisilazane to stabilize the substrates. These substrates can be used as chlorination and esterification catalysts.
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