Silica-based substrates modified by grafting of polyalkylguanidinium groups, their process of manufacture and their use as catalysts
AssigneeSociete Nationale des Poudres et Explosifs - S.N.P.E.
InventorsPatricia Gauthier, Philippe Gros, Pierre Le Perchec, Jean-Pierre Senet
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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.
Claims14
A silica-based substrate having a surface which is modified by grafted covalent links of organic groups, wherein each such organic group is a guantdinium group, each nitrogen atom of which is substituted.
A trimethoxylsilane polyalkylguanidinium ion of the formula (II):
- ##STR12## wherein Y represents a C.sub.2 -C.sub.10 bivalent alkyl radical, branched or not, having at least two carbon atoms in a linear chain between silicon and nitrogen atoms;
- Z represents a C.sub.2 -C.sub.10 bivalent aliphatic radical;
- R' represents a C.sub.1 -C.sub.4 alkyl radical;
- each of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, and R.sub.7 is, independently, a C.sub.1 -C.sub.6 alkyl radical;
- n is 0 or an integer;
- and
- Me is methyl.
Dependencies are inferred from the claim text.