# US 5,345,003 A · Method for preparing 2,3-dichloro-1-propanol and 3-chloro-1-propanol

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

- Number: US 5,345,003 A
- Document ID: US5345003A
- Status: Granted
- Kind: A
- Application number: 08/062,755
- Filed: 1993-05-18
- Granted: 1994-09-06
- Earliest claimed: 1992-07-13
- Assignees: Mitsui Toatsu Chemicals, Inc.
- Inventors: Hiroyoshi Watanabe; Fumie Hayakawa
- Web page: https://patentgrep.com/patent/US5345003A

## CPC

- C07C 29/32: increasing the number of carbon atoms by reactions without formation of -OH groups
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

A method for preparing 2,3-dichloro-1-propanol and 3-chloro-1-propanol is here disclosed which comprises the step of reacting 1,2-dichloroethane with methanol by the irradiation of light in the presence of at least one compound selected from the group consisting of europium compounds, samarium compounds and ytterbium compounds, and if necessary, in the additional presence of a zeolite.

## Claims

### Claim 1

A method for preparing 2,3-dichloro-1-propanol and 3-chloro-1-propanol, which comprises the steps of:
reacting 1,2-dichloroethane with methanol, containing no more than 0.1 percent by weight water, in a molar ratio in the range of 0.001 to 100 by exposure to white light of wavelength ranging from ultraviolet light to visible light or monochromatic light at a temperature ranging from -30.degree. to 140.degree. C. in the presence of at lest one metal compound catalyst selected from the group consisting of europium compounds, samarium compounds and ytterbium compounds or powdered Eu, Sm or Yb metal, the amount of compound or metal catalyst ranging from 0.01 to 2000 milligrams in terms of the metal atom content of the catalyst per one liter of the liquid phase of the reaction system.

### Claim 2 (depends on 1)

The method of claim 1, wherein the catalyst compound is an oxide, hydroxide, fluoride, chloride, bromide, iodide, mineral acid salt, organic acid salt, alkoxide, chelate, carbonate, perchlorate or tungstate of the trivalent metal or the chloride of the divalent metal.

### Claim 3 (depends on 1)

The method of claim 1, wherein the molar ratio of 1,2-dichloroethane to methanol ranges from 0.01 to 50.

### Claim 4 (depends on 1)

The method of claim 1, wherein the temperature of the reaction ranges from 0.degree. to 100.degree. C.

### Claim 5 (depends on 1)

The method of claim 1, wherein the amount of compound or metal catalyst ranges from 0.1 to 1000 milligram in terms of the metal atom content of the catalyst per 1 liter of the liquid phase of the reaction system.

### Claim 6

A method for preparing 2,3-dichloro-1-propanol and 3-chloro-1-propanol, which comprises the steps of:
reacting 1,2-dichloroethane with methanol, containing no more than 0.1 percent by weight water, in a molar ratio in the range of 0.001 to 100 by exposure to white light of wavelength ranging from ultraviolet light to visible light or monochromatic light at a temperature ranging from -30.degree. to 140.degree. C. in the presence of a zeolite and at least one metal compound catalyst selected from the group consisting of europium compounds, samarium compounds and ytterbium compounds or powdered Eu, Sm or Yb metal, the amount of compound or metal catalyst ranging from 0.01 to 2000 milligrams in terms of the metal atom content of the catalyst per one liter of the liquid phase of the reaction system and the amount of said zeolite ranging from 0.01 to 100 parts by weight of the reaction solution comprising the compound or metal catalyst, 1,2-dichloroethane and methanol.

### Claim 7 (depends on 6)

The method of claim 6, wherein the catalyst compound is an oxide, hydroxide, fluoride, chloride, bromide, iodide, mineral acid salt, organic acid salt, alkoxide, chelate, carbonate, perchlorate or tungstate of the trivalent metal or the chloride of the divalent metal.

### Claim 8 (depends on 6)

The method of claim 6, wherein the molar ratio of 1,2-dichloroethane to methanol ranges from 0.01 to 50.

### Claim 9 (depends on 6)

The method of claim 6, wherein the temperature of the reaction ranges from 0.degree. to 100.degree. C.

### Claim 10 (depends on 6)

The method of claim 6, wherein the amount of compound or metal catalyst ranges from 0.1 to 1000 milligram in terms of the metal atom content of the catalyst per 1 liter of the liquid phase of the reaction system.

### Claim 11 (depends on 2, 6)

The method according to claim 2 or 6, wherein the production ratio of 2,3-dichloro-1-propanol to 3-chloro-1-propanol is controlled by changing the molar ratio of 1,2-dichloroethane to methanol.