Preparation of N-chloroformyl-carbamic acid amides and esters
US4001318A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1974 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | May 17, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C275/58
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
N-chloroformyl carbamic acid amides and esters having the functional group ##EQU1## are prepared by reacting phosgene with an imino compound having the functional group ##EQU2## and free of interfering radicals. Preferably the starting material has the formula ##EQU3## in which R.sup.1 is a monovalent or divalent optionally substituted aliphatic, cycloaliphatic, araliphatic or aromatic radical, PA1 R.sup.2 is an optionally substituted alkyl or aralkyl radical, PA1 R.sup.3 is a monovalent optionally substituted aliphatic, cycloaliphatic, araliphatic or aromatic radical, and any two of the radicals R.sup.1, R.sup.2 and R.sup.3 can conjointly be a constituent of a 4-membered to 7-membered heterocyclic ring, PA1 X is oxygen, sulfur or an N--R.sup.4 radical, in which PA1 R.sup.4 is an optionally substituted C.sub.1 -C.sub.6 alkyl, cycloalkyl, aralkyl or aromatic radical, or PA1 R.sup.3 and R.sup.4 together optionally form a constituent of a 4-membered to 7-membered ring, and PA1 n is 1 when R.sup.1 is monovalent and 2 when R.sup.1 is divalent. Certain of the compounds of the formula ##EQU4## are new and herbicidally active.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.