Title of Invention	AN IMPROVED PROCESS FOR THE PREPARATION OF ESTERS FROM CARBOXYLIC ACIDS USING LEWIS ACID CATALYSTS.
Abstract	The invention provides an improved process for the esteriflcation of a wide variety of carboxylic acid such as aromatic, aliphatic, α , β -unsaturated or dicarboxylic acids using readily available Lewis acid catalysts such as CuC12, A1c13, ZnC12, CeCl3 and FeCl3, BF3 Et2O. The important feature of the invention is that the reactions were carried out at room temperature avoiding the use of hydrocarbon solvents .

Title of Invention

AN IMPROVED PROCESS FOR THE PREPARATION OF ESTERS FROM CARBOXYLIC ACIDS USING LEWIS ACID CATALYSTS.

Abstract

Full Text	The invention provides an improved process for the esteriflcation of a wide variety of carboxylic acid such as aromatic, aliphatic, α , β -unsaturated or dicarboxylic acids using readily available Lewis acid catalysts such as CuC12, A1c13, ZnC12, CeCl3 and FeCl3, BF3 Et2O. The important feature of the invention is that the reactions were carried out at room temperature avoiding the use of hydrocarbon solvents . We Claim: 1 . An improved process for the preparation of esters from carboxylic acids using Lewis acid catalysts which comprises reacting carboxylic acids such as aromatic, aliphatic, α,β -unsaturated and dicarboxylic acids , such as herein described , with aliphatic alcohols selected from methyl alcohol, ethyl alcohol, iso propanol and ter butanol in the ratio ranging from 1 : 1 to 1:3 , in presence of Lewis acid catalysts such as herein described wherein amount of Lewis acid employed is 0.1 - 0.5 equivalents of carboxylic acid, for time period ranging from 5- 120 minutes , under stirring at room temperature and recovering the corresponding esters by the conventional solvent extraction method such as herein described . 2. An improved process as claimed in claims 1 wherein the aromatic, aliphatic, α,β -unsaturated or dicarboxylic acids is selected from the group consisting of oxalic acid , malonic acid , succinic acid, adipic acid and L-tartaric acid . 3. An improved process as claimed in claims 1 - 2 wherein the Lewis acid catalysts used is selected from CuCI2, AICI3, ZnCI2, CeCI3 and FeC13 , BF3 Et2O. 4. An improved process for the preparation of esters from carboxylic acids using Lewis acid catalysts substantially as herein described with reference to the examples 1 to 23.

Full Text

The invention provides an improved process for the esteriflcation of a wide variety of carboxylic acid such as aromatic, aliphatic, α , β -unsaturated or dicarboxylic acids using readily available Lewis acid catalysts such as CuC12, A1c13, ZnC12, CeCl3 and FeCl3, BF3 Et2O. The important feature of the invention is that the reactions were carried out at room temperature avoiding the use of hydrocarbon solvents .

We Claim:
1 . An improved process for the preparation of esters from carboxylic acids using Lewis acid catalysts which comprises reacting carboxylic acids such as aromatic, aliphatic, α,β -unsaturated and dicarboxylic acids , such as herein described , with aliphatic alcohols selected from methyl alcohol, ethyl alcohol, iso propanol and ter butanol in the ratio ranging from 1 : 1 to 1:3 , in presence of Lewis acid catalysts such as herein described wherein amount of Lewis acid employed is 0.1 - 0.5 equivalents of carboxylic acid, for time period ranging from 5- 120 minutes , under stirring at room temperature and recovering the corresponding esters by the conventional solvent extraction method such as herein described .
2. An improved process as claimed in claims 1 wherein the aromatic,
aliphatic, α,β -unsaturated or dicarboxylic acids is selected from the
group consisting of oxalic acid , malonic acid , succinic acid, adipic acid
and L-tartaric acid .
3. An improved process as claimed in claims 1 - 2 wherein the Lewis acid
catalysts used is selected from CuCI2, AICI3, ZnCI2, CeCI3 and FeC13 , BF3
Et2O.
4. An improved process for the preparation of esters from carboxylic acids
using Lewis acid catalysts substantially as herein described with reference
to the examples 1 to 23.

Documents:

3561-del-1998-abstract.pdf

3561-del-1998-claims.pdf

3561-del-1998-correspondence-others.pdf

3561-del-1998-correspondence-po.pdf

3561-del-1998-description (complete).pdf

3561-del-1998-form-1.pdf

3561-del-1998-form-19.pdf

3561-del-1998-form-2.pdf

3561-del-1998-form-3.pdf

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Patent Number

218150

Indian Patent Application Number

3561/DEL/1998

PG Journal Number

19/2008

Publication Date

09-May-2008

Grant Date

31-Mar-2008

Date of Filing

27-Nov-1998

Name of Patentee

COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH

Applicant Address

RAFI MARG, NEW DELHI - 110001, INDIA.

Inventors:

#	Inventor's Name	Inventor's Address
1	GOWRAVARAM SABITHA	INDIAN INSTITUTE OF CHEMICAL TECHNOLOGY HYDERABAD-500007, ANDHRA PRADESH
2	RAVULA SATHEESH BABU	INDIAN INSTITUTE OF CHEMICAL TECHNOLOGY HYDERABAD-500007, ANDHRA PRADESH
3	JHILLU SINGH YADAV	INDIAN INSTITUTE OF CHEMICAL TECHNOLOGY HYDERABAD-500007, ANDHRA PRADESH

PCT International Classification Number

C07C 69/616

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1			NA