Claims
- 1. In an elevated temperature and pressure process for making a carbamate by carbonylating a substance selected from the group consisting of phenylene or tolylene diamine, phenylene or tolylene diformamide, phenylene or tolylene diurea, phenylene or tolylene dihydrazine, and compounds of formula R(NHCOH).sub.2, wherein R is an alkylene group, --CH.sub.2).sub.x --, in which x runs between two and six, with carbon monoxide in the presence of a C.sub.1 to C.sub.3 alkanol, an oxygen transfer agent, and a catalyst comprising a palladium compound, the improvement which uses pyridine N-oxide as said oxygen-transfer agent.
- 2. The process of claim 1 wherein said C.sub.1 to C.sub.3 alkanol is methanol.
- 3. The process of claim 2 wherein said catalyst comprises palladium chloride.
- 4. The process of claim 3 wherein said substance is a compound of formula R.sub.2 (NHCOH).sub.2 wherein R.sub.2 is an alkenylene group, --(CH.sub.2).sub.x --, in which x runs between two and six.
- 5. The process of claim 1 wherein the deoxygenated form of said oxygen-transfer agent is reoxidized after transfer of its oxygen.
- 6. The process of claim 4 wherein the deoxygenated form of said oxygen-transfer agent is reoxidized after transfer of its oxygen.
- 7. The process of claim 1 wherein said elevated temperature lies between about 100.degree. C. and about 300.degree. C. and said elevated pressure lies between about 200 psi and about 2000 psi.
- 8. The process of claim 6 wherein said elevated temperature lies between about 100.degree. C. and about 300.degree. C. and said elevated pressure lies between about 200 psi and about 2000 psi.
Parent Case Info
This is a continuation of application Ser. No. 101,126, filed Sept. 21, 1987 now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
71835 |
Feb 1983 |
EPX |
83096 |
Jul 1983 |
EPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
101126 |
Sep 1987 |
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