Process for preparation of aromatic sulfone compounds
AssigneeAgency of Industrial Science and Technology
InventorYoshie Souma
Life of this patent
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Abstract
An aromatic hydrocarbon represented by the following general formula [I]: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 stand for a hydrogen atom or alkyl group, is reacted with a halogenated sulfonic acid in the presence of a Lewis acid to obtain an aromatic sulfone compound represented by the following general formula [II]: ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above and Z stands for a halogen atom or an aromatic hydrocarbon group represented by the following general formula [III]: ##STR3## in which R.sub.1, R.sub.2 and R.sub.3 are as defined above.
Claims4
A process for the preparation of an aromatic sulfone compound, comprising the steps of:
- (a) mixing together a Lewis acid and a halogenated sulfonic acid selected from the group consisting of chlorosulfonic acid, fluorosulfonic acid and a mixture thereof to provide a super-strong acid having the formula, [XSO.sub.2.sup.+ ]+[OH.sup.- ] MX.sub.n, wherein X is a halogen atom, M is the metal atom of the Lewis acid, and n is 3 or 5;
- (b) adding an aromatic hydrocarbon having the below formula (I):
- ##STR12## to the above provided super-strong acid;
- (c) reacting the resulting mixture at a temperature of 20.degree. to 80.degree. C.;
- and
- (d) separating an aromatic sulfone compound having the following formula (II):
- ##STR13## out of the resultant reaction mixture;
- wherein R.sub.1, R.sub.2 and R.sub.3 are each a hydrogen atom or an alkyl group, and Z is an atom or a group selected from the group consisting of a chlorine atom, a fluorine atom and a group having the following formula (III):
- ##STR14## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined as above.
Dependencies are inferred from the claim text.