# US 7,612,227 B2 · Processes for producing 3-methyl-2-butenyl acetate

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,612,227 B2
- Document ID: US7612227B2
- Status: Granted
- Kind: B2
- Application number: 10/590,991
- Filed: 2005-03-22
- Published: 2008-11-06
- Granted: 2009-11-03
- Earliest claimed: 2004-03-25
- Assignees: Sumitomo Chemical Company, Limited
- Inventors: Katsuhisa Masumoto; Makoto Itagaki
- Web page: https://patentgrep.com/patent/US7612227B2

## CPC

- C07C 67/08: by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
- C07C 67/58: by liquid-liquid treatment
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The present invention relates to a method for producing 3-methyl-2-butenyl acetate which comprises reacting 3-methyl-2-buten-1-ol with acetic anhydride in the presence of an inorganic base catalyst and a method for producing purified 3-methyl-2-butenyl acetate which comprises subjecting crude 3-methyl-2-butenyl acetate to a step (A) of contacting it with an aqueous solution of an alkali metal hydrogen sulfite, or a step (B) of contacting it with an aqueous solution of a base, or both steps (A) and (B).

## Claims

### Claim 1

A method for producing purified 3-methyl-2-butenyl acetate which comprises subjecting crude 3-methyl-2-butenyl acetate to a step (A) of making it contact with an aqueous solution of an alkali metal hydrogen sulfite, or both step (A) and a step (B) of making it contact with an aqueous solution of a base.

### Claim 2 (depends on 1)

The method according to claim 1, which comprises subjecting crude 3-methyl-2-butenyl acetate to the step (A), and next to the step (B).

### Claim 3 (depends on 2)

The method according to claim 2, wherein the aqueous solution of the base is an aqueous solution of an alkali metal hydrogen carbonate.

### Claim 4 (depends on 1)

The method according to claim 1, wherein an impurity contained in the crude 3-methyl-2-butenyl acetate is carboxylic acid and/or an aldehyde.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the crude 3-methyl-2-butenyl acetate is obtained by reacting 3-methyl-2-buten-1-ol with acetic anhydride in the presence of an inorganic base catalyst.