# US 6,294,705 B1 · Method for producing alkali metal alcoholates

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- Number: US 6,294,705 B1
- Document ID: US6294705B1
- Status: Granted
- Kind: B1
- Application number: 09/700,210
- Filed: 2001-02-06
- Granted: 2001-09-25
- Earliest claimed: 1998-05-13
- Assignees: Chemetall GmbH
- Inventors: Ulrich Wietelmann; Uwe Lischka; Ute Emmel
- Web page: https://patentgrep.com/patent/US6294705B1

## CPC

- C07C 29/70: by converting hydroxy groups to O-metal groups {(C07C29/09 takes precedence)}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS

## Abstract

The invention relates to a method for producing alkali metal alcoholates by reacting alcohol with alkali metal in an aprotic, organic solvent in the presence of an H acceptor such as e.g. isoprene, butadiene, styrene or methyl styrene.

## Claims

### Claim 1

Method for the preparation of alkali metal alcoholates by reacting alcohol with alkali metal in an aprotic organic solvent, characterised in that the synthesis is carried out in the presence of an H-acceptor, with the H-acceptor being an open-chain, unsubstituted or substituted 1,3-diene
with R1, R2=H, alkyl, vinyl (R1, R2 in cis or trans position)
or a cyclic 1,3-diene
with n=1 to 5
or an unsubstituted or substituted arylolefine
with R3, R4=H, alkyl (R3, R4 in cis or trans position).

### Claim 2 (depends on 1)

Method according to claim 1, characterised in that the H-acceptor is isoprene, butadiene, cyclohexadiene-1,3; styrene or methyl styrene.

### Claim 3 (depends on 1)

Method according to claim 1, characterised in that the quantity of H-acceptor used is 0.2 to 4 mol per every 2 mol alcohol.

### Claim 4 (depends on 3)

Method according to claim 3, characterised in that the quantity of H-acceptor used is 0.4 to 1.5 mol per every 2 mol alcohol.

### Claim 5 (depends on 1)

Method according to claim 1, characterised in that one or more of the metals Li, Na or K is or are used as the alkali metal.

### Claim 6 (depends on 1)

Method according to claim 1, characterised in that the alkali metal is present in solid form (pulverulent form, granular form or in lumps) or, in the case of the Na, K, Rb or Cs, even in a finely divided, liquid form.

### Claim 7 (depends on 1)

Method according to claim 1, characterised in that a secondary or tertiary alcohol is used as the alcohol.

### Claim 8 (depends on 7)

Method according to claim 7, characterised in that i-propanol or t-butanol or t-pentanol is used as the alcohol.

### Claim 9 (depends on 1)

Method according to claim 1, characterised in that an aliphatic or aromatic C4- to C20-hydrocarbon or an ether or a mixture of the substances mentioned is used as the aprotic solvent.

### Claim 10 (depends on 9)

Method according to claim 9, characterised in that hexane or heptane or octane or toluene or ethyl benzene or methyl tert-butyl ether or diethyl ether or tetrahydrofuran or 2-methyl tetrahydrofuran is used as the aprotic solvent.

### Claim 11 (depends on 9)

Method according to claim 9, characterised in that a hydrocarbon mixture, such as petroleum ether or high-boiling hydrocarbon mixtures (paraffin oil), is used as the aprotic solvent.

### Claim 12 (depends on 1)

Method according to claim 1, characterised in that a mixture of alcohol and H-acceptor is added to the alkali-metal dispersion in a solvent.

### Claim 13 (depends on 1)

Method according to claim 1, characterised in that the temperature of reaction is maintained at −20 to 200° C.

### Claim 14 (depends on 13)

Method according to claim 13, characterised in that the reaction temperature is maintained at 20 to 140° C.

### Claim 15 (depends on 1)

Method according to claim 1, characterised in that possible excess alkali metal is filtered off, and an alkali metal alcoholate solution is obtained as an end product.

### Claim 16 (depends on 1)

Method according to claim 1, characterised in that at the end of the reaction possible excess alkali metal is filtered off, the reaction solution is concentrated by evaporation, and solid alkali metal alcoholate is obtained as an end product.