Method for production of aromatic compounds
First Claim
1. In the production of an aromatic compound represented by the general formula (2) by hydrolyzing and decarboxylating an aromatic cyano compound represented by the general formula (1) in the presence of an acidic substance, a method for the production of the aromatic. compound, characterized by performing the reactions of hydrolysis and decarboylation in multiple steps (wherein X is a halogen atom, Y is a cyano group, nitro group, or carboxyl group, Z is a nitrogen-containing group represented by —
- N(R1)(R2) (wherein R1 and R2 are identical or not identical substitutes superposed on a nitrogen atom and selected from among hydrogen atom and linear or branched alkyl groups of 1 to 4 carbon atoms), m is 0, 1, or 2, and n is 1, 2, 3, or 4, providing that the sum of m and n falls in the range of 1≦
m+n≦
4) (wherein the symbols have the same meanings as in the general formula (1).
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Abstract
For the production of an aromatic compound by hydrolyzing and decarboxylating a corresponding aromatic cyano compound in the presence of an acidic substance, this invention provides a method for the production of the aromaic compound, characterized by carrying out the reactions of hydrolysis and decarboxylaion in multiple steps. Particularly when the aromatic cyano compound contains a halogen, this method effectively prevents the reaction vessels from being corroded by the by-produced hydrogen halogenide and enables the target compound to be produced in a high yield.
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Citations
17 Claims
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1. In the production of an aromatic compound represented by the general formula (2) by hydrolyzing and decarboxylating an aromatic cyano compound represented by the general formula (1) in the presence of an acidic substance, a method for the production of the aromatic. compound, characterized by performing the reactions of hydrolysis and decarboylation in multiple steps
(wherein X is a halogen atom, Y is a cyano group, nitro group, or carboxyl group, Z is a nitrogen-containing group represented by — - N(R1)(R2) (wherein R1 and R2 are identical or not identical substitutes superposed on a nitrogen atom and selected from among hydrogen atom and linear or branched alkyl groups of 1 to 4 carbon atoms), m is 0, 1, or 2, and n is 1, 2, 3, or 4, providing that the sum of m and n falls in the range of 1≦
m+n≦
4)(wherein the symbols have the same meanings as in the general formula (1). - View Dependent Claims (2, 3, 4, 5, 6)
- N(R1)(R2) (wherein R1 and R2 are identical or not identical substitutes superposed on a nitrogen atom and selected from among hydrogen atom and linear or branched alkyl groups of 1 to 4 carbon atoms), m is 0, 1, or 2, and n is 1, 2, 3, or 4, providing that the sum of m and n falls in the range of 1≦
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7. A method for the production of an aromatic compound, characterized by forming an aromatic compound represented by the general formula (2) by hydrolyzing and decarboxylating an aromatic cyano compound represented by the general formula (1) in the presence of an aqueous medium and subsequently recovering the obtained aromatic compound from the reaction solution by azeotropic distillation with water
(wherein X is a halogen atom, Y is a cyano group, nitro group, or carboxyl group, Z is a nitrogen-containing group represented by — - N(R1)(R2) (wherein R1 and R2 are identical or not identical substitutes superposed on a nitrogen atom and selected from among hydrogen atom and linear or branched alkyl groups of 1 to 4 carbon atoms), m is 0, 1, or 2, and n is 1, 2, 3, or 4, providing that the sum of m and n falls in the range of 1≦
m+n≦
4)(wherein the symbols have the same meanings as in the general formula (1). - View Dependent Claims (8, 9, 10, 11, 12, 13)
- N(R1)(R2) (wherein R1 and R2 are identical or not identical substitutes superposed on a nitrogen atom and selected from among hydrogen atom and linear or branched alkyl groups of 1 to 4 carbon atoms), m is 0, 1, or 2, and n is 1, 2, 3, or 4, providing that the sum of m and n falls in the range of 1≦
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14. In the production of an aromatic compound represented by the general formula (2) by hydrolyzing and decarboxylating an aromatic cyano compound represented by the general formula (1) in the presence of an acidic substance, a method for the production of the aromatic compound, characterized by performing the hydrolysis and decarboxylation in multiple steps and effecting the recovery of the formed aromatic compound from the reaction solution by azeotropic distillation with water
(wherein X is a halogen atom, Y is a cyano group, nitro group, or carboxyl group, Z is a nitrogen-containing group represented by — - N(R1)(R2) (wherein R1 and R2 are identical or not identical substitutes superposed on a nitrogen atom and selected from among hydrogen atom and linear or branched alkyl groups of 1 to 4 carbon atoms), m is 0, 1, or 2, and n is 1, 2, 3, or 4, providing that the sum of m and n falls in the range of 1≦
m+n≦
4)(wherein the symbols have the same meanings as in the general formula (1). - View Dependent Claims (15, 16, 17)
- N(R1)(R2) (wherein R1 and R2 are identical or not identical substitutes superposed on a nitrogen atom and selected from among hydrogen atom and linear or branched alkyl groups of 1 to 4 carbon atoms), m is 0, 1, or 2, and n is 1, 2, 3, or 4, providing that the sum of m and n falls in the range of 1≦
Specification