Process for preparing and recovering 4,4'-dihydroxy-alpha-alkylstilbene or 4,4'-dihydroxy-alpha, alpha'dialkylstilbene
First Claim
1. A process for preparing a 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene which comprises:
- (A) reacting at a temperature of from -20°
C. to 20°
C. a mixture of;
(1) at least one alpha-haloketone;
(2) at least one compound containing one phenolic hydroxyl group or aromatic alkoxy group per molecule such that the mole ratio of phenolic hydroxyl group-containing or aromatic alkoxy group-containing compound(s);
alpha-haloketone(s) is at least 0.1;
1; and
(3) either (a) at least one strong protonic acid or (b) at least one Lewis acid, or (c) any combination thereof;
such that the mole ratio of phenolic hydroxyl group-containing or aromatic alkoxy group-containing compound(s);
alpha-haloketone(s);
strong protonic acid(s) or Lewis acid(s) or combination thereof is from 0.1;
1;
0.0026 to 20;
1;
8;
thereby forming a reaction product containing at least one halogen-containing bisphenol compound which, upon being dehydrohalogenated, forms a 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene;
(B) reducing the acid content of the product resulting from step (A) to less than 10,000 ppm;
(C) dehydrohalogenating the product obtained from step (B), thereby forming a dehydrohalogenated product containing 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene;
(D) adding water to the product of step (C) in amounts sufficient to crystallize at least a portion of the 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene and recovering the crystals and the remaining organic phase separately;
(E) independently repeating steps (A), (B), and (C) to obtain a dehydrohalogenated product;
(F) mixing at least a portion of organic phase obtained in step (D) with the product obtained in step (E); and
(G) adding mater to the mixture obtained in step (F) in amounts sufficient to crystallize at least a portion of the 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene and recovering the crystals.
1 Assignment
0 Petitions
Accused Products
Abstract
A process for preparing a 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene which includes the steps of (A) reacting at a temperature of from -20° C. to 20° C. a mixture of: (1) at least one alpha-haloketone; (2) at least one compound containing one phenolic hydroxyl group or aromatic alkoxy group per molecule such that the mole ratio of phenolic hydroxyl group-containing or aromatic alkoxy group-containing compound(s):alpha-haloketone(s) is at least 0.1:1; and (3) either (a) at least one strong protonic acid or (b) at least one Lewis acid, or (c) any combination thereof; thereby forming a reaction product containing at least one halogen-containing bisphenol compound which, upon being dehydrohalogenated, forms a 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha, alpha'"'"'-dialkylstilbene; (B) reducing the acid content of the product resulting from step (A) to less than 10,000 ppm; (C) dehydrohalogenating the product obtained from step (B), thereby forming a dehydrohalogenated product containing 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene; (D) adding water to the product of step (C) in amounts sufficient to crystallize at least a portion of the, 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene and recovering the crystals and the remaining organic phase separately; (E) independently repeating steps (A), (B), and (C) to obtain a dehydrohalogenated product; (F) mixing at least a portion of organic phase obtained in step (D) with the product obtained in step (E); and (G) adding water to the mixture obtained in step (F) in amounts sufficient to crystallize at least a portion of the 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene and recovering the crystals.
14 Citations
20 Claims
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1. A process for preparing a 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene which comprises:
-
(A) reacting at a temperature of from -20°
C. to 20°
C. a mixture of;(1) at least one alpha-haloketone; (2) at least one compound containing one phenolic hydroxyl group or aromatic alkoxy group per molecule such that the mole ratio of phenolic hydroxyl group-containing or aromatic alkoxy group-containing compound(s);
alpha-haloketone(s) is at least 0.1;
1; and(3) either (a) at least one strong protonic acid or (b) at least one Lewis acid, or (c) any combination thereof; such that the mole ratio of phenolic hydroxyl group-containing or aromatic alkoxy group-containing compound(s);
alpha-haloketone(s);
strong protonic acid(s) or Lewis acid(s) or combination thereof is from 0.1;
1;
0.0026 to 20;
1;
8;
thereby forming a reaction product containing at least one halogen-containing bisphenol compound which, upon being dehydrohalogenated, forms a 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene;(B) reducing the acid content of the product resulting from step (A) to less than 10,000 ppm; (C) dehydrohalogenating the product obtained from step (B), thereby forming a dehydrohalogenated product containing 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene; (D) adding water to the product of step (C) in amounts sufficient to crystallize at least a portion of the 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene and recovering the crystals and the remaining organic phase separately; (E) independently repeating steps (A), (B), and (C) to obtain a dehydrohalogenated product; (F) mixing at least a portion of organic phase obtained in step (D) with the product obtained in step (E); and (G) adding mater to the mixture obtained in step (F) in amounts sufficient to crystallize at least a portion of the 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene and recovering the crystals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for preparing a 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene which comprises:
-
(A) reacting at a temperature of from -20°
C. to 20°
C. a mixture of;(1) at least one alpha-haloketone; (2) at least one compound containing one phenolic hydroxyl group or aromatic alkoxy group per molecule such that the mole ratio of phenolic hydroxyl group-containing or aromatic alkoxy group-containing compound(s);
alpha-haloketone(s) is at least 0.1;
1; and(3) either (a) at least one strong protonic acid or (b) at least one Lewis acid, or (c) any combination thereof; such that the mole ratio of phenolic hydroxyl group-containing or aromatic alkoxy group-containing compound(s);
alpha-haloketone(s);
strong protonic acid(s) or Lewis acid(s) or combination thereof is from 0.1;
1;
0.0026 to 20;
1;
8;
thereby forming a reaction product containing at least one halogen-containing bisphenol compound which, upon being dehydrohalogenated, forms a 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene;(B) reducing the acid content of the product resulting from step (A) to less than 10,000 ppm; (C) dehydrohalogenating the product obtained from step (B), thereby forming a dehydrohalogenated product containing 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene; (D) adding water to the product of step (C) in amounts sufficient to crystallize at least a portion of the 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene; (E) recovering the crystals and the remaining organic phase separately; (F) independently repeating steps (A), (B), (C), and (D) to obtain an aqueous slurry containing crystallized 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene; mixing at least a portion of the organic phase obtained in step (D) with the slurry obtained in step (F) under conditions sufficient to crystallize at least a portion of the 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene present in the organic phase obtained in step (D); and
recovering the crystals of 4,4'"'"'-dihydroxy-alpha-alkylstilbene or 4,4'"'"'-dihydroxy-alpha,alpha'"'"'-dialkylstilbene. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification