Utilization of phosphorus pentasulfide in thionylations using phase transfer catalysis
US6960669B2 · kind B2 · utility
0Cited by
4References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2003 |
| Grant date | Nov 1, 2005 |
| Priority date | — |
| Expiry date | Apr 7, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D333/70
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method is disclosed for the preparation of benzo[b]thiophenecarbodithioic esters of the formula: wherein R is alkyl, R1 is hydrogen, halogen, or alkyl, R2, R3, R4, and R5 are independently selected from the group consisting of hydrogen, halogen, alkyl, alkoxy, alkylthio, trifluoromethyl, cyano, and aryl,wherein said method comprises reacting an equivalent of an S-thiol ester of the formula: with one-third of an equivalent of P2S5, 2 equivalents of at least one alkali metal carbonate, about 2.5 mole percent of a phase transfer catalyst, and a catalytic amount of water in hot toluene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.