Method for production of additives for lubricating oils
US7074937B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 2003 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | Jul 29, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D233/42
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for making a compound of formula (I)wherein bonds a and b are single or double bonds, provided that one of a and b is a single bond and the other is a double bond; one of B1 and B2 is —CHR5—CHR6—C(Y)ZR7 and the other is absent; B3 is hydrogen; Y is O or S; Z is O, S or NR9; R5 is hydrogen or C1–C4 alkyl; R6 is hydrogen or C1–C4 alkyl; R7, R9 are independently hydrogen, alkyl, alkenyl, aryl or aralkyl. The method comprises steps of: (a) preparing an imidazolidinethione having formulaby combining a cyanide source, a sulfide salt, and at least one ketone or aldehyde; and (b) adding to the imidazolidinethione, without isolation of the imidazolidinethione, CHR5═CR6—C(O)OR7.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.