# US 4,394,320 A · Synthesis of stannic tetra mercaptides

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- Number: US 4,394,320 A
- Document ID: US4394320A
- Status: Granted
- Kind: A
- Application number: 06/356,820
- Filed: 1982-03-10
- Granted: 1983-07-19
- Earliest claimed: 1981-03-12
- Assignees: Societe Nationale Elf Aquitaine
- Inventors: Michel Pereyre; Jean-Claude Pommier
- Web page: https://patentgrep.com/patent/US4394320A

## CPC

- C07F 7/2204: {Not belonging to the groups C07F7/2208 - C07F7/2296}
- C07F 7/226: {Compounds with one or more Sn-S linkages}
- C07F: ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM (metal-containing porphyrins C07D487/22)

## Abstract

Process for the preparation of stannic tetra mercaptides in an economic manner through the action of corresponding mercaptans and metallic tin, at a temperature maintained between 15.degree. C. and 200.degree. C.

## Claims

### Claim 1

Process of preparation of stannic tetra mercaptides from corresponding mercaptans comprising the step of heating the mercaptan with metallic tin.

### Claim 2 (depends on 1)

Process according to claim 1, wherein the tin is in the form of particles of 1 micron to 5 mm in diameter.

### Claim 3 (depends on 2)

Process according to claim 2, wherein said particles are of 10 to 500 microns in diameter.

### Claim 4 (depends on 1, 2, 3)

Process according any one of claims 1 to 3, wherein the heating is carried out at a temperature of 150.degree. to 200.degree. C.

### Claim 5 (depends on 4)

Process according to claim 4, wherein the heating is carried out at a temperature between 170.degree. to 190.degree. C.

### Claim 6 (depends on 1, 2, 3)

Process according to one of the claims 1 to 3, wherein the proportion of tin is from 1 to 4 gram atoms per 4 moles of mercaptan.

### Claim 7 (depends on 1, 2, 3)

Process according to one of the claims 1 to 3, wherein the proportion of tin is from 1.5 to 3 gram atoms Sn for 4 moles of mercaptan.

### Claim 8 (depends on 1, 2, 3)

Process according to one of the claims 1 to 3, wherein the unreacted tin is separated by filtration in order to be re-used in a fresh operation.

### Claim 9 (depends on 8)

Process according to claim 8, wherein the reaction medium is fluidified by addition of a solvent prior to filtration, with the purpose of separating the unreacted tin.

### Claim 10 (depends on 1, 2, 3)

Process according to one of claims 1 to 3, wherein the unreacted mercaptan fraction is eliminated from the reaction medium in order to be recycled in a fresh operation.

### Claim 11 (depends on 1)

Process according to claim 1 wherein the mercaptan is selected from the group consisting of lauryl mercaptan, n-octyl mercaptan and cyclohexyl mercaptan.