Water-stable compounds, catalysts and catalysed reactions

Details Water-stable compounds, catalysts and catalysed reactions Water-stable compounds, catalysts and catalysed reactions

B - Operations, Transporting

01

J

B01J 31/02 (2006.01)

Patent

CA 2687834

The invention provides a method of carrying out a Lewis-acid catalysed organic reaction in the presence of a Lewis acid catalyst comprising a metal-organic compound having the following formula: M(HO(CR1 R2)z)a(O(CR1R2)z)bY-(CR3R4).chi.-Y((CR1R2)zO)c((CR1R2)zOH)d.nR5OH (Formula I) in which: M is a metal atom, preferably titanium, zirconium, hafnium or iron (III) Y is selected from P and N, but is very preferably N; each R1, R2, R3 and R4 is independently selected from H, alkyl, aryl, substituted alkyl or substituted aryl, R5 is hydrogen, an alkyl group, a hydroxy-functionalised alkyl group, a polyoxyalkylmoiety, R6O or R7COO where R6 and R7may each represent H, alkyl, aryl or alkyl-aryl; d and a are each O or 1, b and c are each 1 or 2, b + c = the valency of M, a+b+c+d = 4, each z is independently 1,2, 3 or 4; x represents the least number of C atoms between the Y atoms and is 2 or 3 and n is a number in the range from 0 to 4. The metal-organic compound forms a stable hydrate in water which retains Lewis-acid catalytic properties.

L'invention concerne un procédé de réalisation d'une réaction organique catalysée à base d'acide de Lewis en présence d'un catalyseur d'acide de Lewis comprenant un composé organométallique ayant la suivante formule : M(HO(CR1 R2)z)a(O(CR1R2)z)bY-(CR3R4).chi.-Y((CR1R2)zO)c((CR1R2)zOH)d.nR5OH (formule I), dans laquelle : M est un atome de métal, de préférence titane, zirconium, hafnium ou fer (III); Y est sélectionné parmi P et N, mais est idéalement N; chacun parmi R1, R2, R3 et R4 est indépendamment sélectionné parmi H, alkyle, aryle, alkyle substitué ou aryle substitué; R5 est hydrogène, un groupe alkyle, un groupe alkyle à fonctionnalité hydroxy, un polyoxyalkylmoiety, R6O ou R7COO où R6 et R7 peuvent représenter chacun H, alkyle, aryle ou alkyle-aryle; d et a sont chacun O ou 1; b et c sont chacun 1 ou 2, b + c = la valence de M, a+b+c+d = 4, chaque z est indépendamment 1, 2, 3 ou 4; x représente le nombre minimum d'atomes C entre les atomes Y et est 2 ou 3; et n est un nombre entre 0 et 4. Le composé organométallique forme un hydrate stable dans l'eau, lequel retient les propriétés catalytiques de l'acide de Lewis.

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