US 5,475,155 A · Preparation of 4,4'-dihydroxy-alpha'-dialkylstilbenes and 4, 4'-dihydroxy-alpha'-dialkylstilbenes

Abstract

4,4'-Dihydroxy-alpha-alkylstilbenes of high purity are prepared by reacting at a temperature of from about -20.degree. C. to about 20.degree. C. a mixture of (1) at least one alpha-haloketone, (2) at least one phenolic hydroxyl-containing compound or alkoxy-containing aromatic compound, and (3) at least one strong protonic acid or Lewis acid; such that the mole ratio of phenolic hydroxyl-containing compound or alkoxy-containing aromatic compound:alpha-haloketone(s) is from 0.1:1 to 1.9:1, and the mole ratio of phenolic hydroxyl-containing compound or alkoxy-containing aromatic compound:alpha-haloketone(s):strong protonic acid or Lewis acid is from about 0.1:1:0.0026 to about 1.9:1:0.95. The high purity 4,4'-dihydroxy-alpha-alkylstilbenes are useful for the advancement of epoxy resins, for the preparation of phenoxy resins and for the preparation of epoxy resins.

Claims11

Dependent claims

A process for preparing 4,4'-dihydroxy-alpha-alkylstilbenes and/or 4,4'-dihydroxy-alpha,alpha'-dialkylstilbenes said process comprising

(A) reacting at a temperature of from about -20.degree. C. to about 20.degree. C. a mixture of
(1) at least one alpha-haloketone;
(2) at least one compound containing one phenolic hydroxyl group per molecule such that the mole ratio of phenolic hydroxyl group-containing compound(s):alpha-haloketone(s) is from, 0.1:1 to 1.9:1;
and
(3) either (a) at least one strong protonic acid or (b) at least one Lewis acid or (c) any combination thereof;
wherein the mole ratio of component (A2):component (A1):component (A3) is from about 0.1:1:0.0026 to about 1.9:1:0.95;
(B) substantially removing or neutralizing any residual acidic materials from the product produced in step (A);
and
(C) dehydrohalogenating the product retained from step (B).

6 more elements

A process for preparing 4,4'-dihydroxy-alpha-alkylstilbenes or 4,4'-dihydroxy-alpha,alpha'-dialkylstilbenes wherein said process comprises

(A) reacting at a temperature of from about -20.degree. C. to about 20.degree. C. a mixture of
(1) at least one alpha-haloketone;
(2) at least one aromatic compound containing one alkoxy group per molecule such that the mole ratio of alkoxy group-containing aromatic compound(s):alpha-haloketone(s) is from 0.1:1 to 1.9:1;
and
(3) either (a) at least one strong protonic acid or (b) at least one Lewis acid or (c) any combination thereof;
wherein the mole ratio of alkoxy group-containing aromatic compound(s):alpha-haloketone(s):strong protonic acid or Lewis acid is from about 0.1:1:0.0026 to about 1.9:1:0.95;
(B) substantially removing or neutralizing any residual acidic materials from the product of step (A);
(C) dehydrohalogenating the product retained from step (B);
and
(D) dealkylating the product resulting from step (C).

7 more elements

Dependencies are inferred from the claim text.

Preparation of 4,4'-dihydroxy-alpha'-dialkylstilbenes and 4, 4'-dihydroxy-alpha'-dialkylstilbenes

Life of this patent

Preparation of 4,4'-dihydroxy-alpha'-dialkylstilbenes and 4, 4'-dihydroxy-alpha'-dialkylstilbenes

Life of this patent

Abstract

Claims11