Patent GB-1511541-A (GB)
Title: N-carbamoyloxyphenyl-carbamates their manufacture and their use as selective herbicides
IPC: C07C239/00
Filed: 1975-03-17
Abstract: 1511541 m - (N - carbamoyloxy)phenyl carbamates SCHERING AG 17 March 1975 [20 March 1974] 10927/75 Heading C2C The invention comprises a compound of the general formula in which R 1  represents an allyl group, an unsubstituted alkyl group containing 1 to 4 carbon atoms or an alkyl group containing 1 to 4 carbon atoms that is substituted by one to five halogen atoms, or represents an alkyl group containing 1 to 4 carbon atoms that is substituted by one to three hydroxyl groups, R 2  represents an unsubstituted alkyl group containing 1 to 4 carbon atoms or an alkyl group containing 1 to 4 carbon atoms that is substituted by one to five halogen atoms, or represents an alkenyl or alkynyl group containing 3 or 4 carbon atoms, a cyclohexyl group, an unsubstituted phenyl group or a phenyl group substiuted by one to three alkyl groups each containing 1 to 3 carbon atoms, or represents a phenyl group substituted by one to three alkoxy groups each containing 1 to 3 carbon atoms, or represents a phenyl group substituted by one to three halogen atoms, or represents a benzyl group or a phenylethyl group, and represents an unsubstituted hydrocarbon group containing 3 or 4 carbon atoms, except an isopropyl or allyl group, or represents a hydrocarbon group containing 3 or 4 carbon atoms that is substituted by one to five halogen atoms, or represents an ethyl group substituted by one to five halogen atoms, with the proviso that when R 1  and R 2  each represents a methyl group or when R<SP>1</SP> and R 2  each represents an ethyl group R 3  does not represent a sec.-butyl group, or R 1  represents an allyl group, an unsubstituted alkyl group containing 1 to 4 carbon atoms or an alkyl group containing 1 to 4 carbon atoms that is substituted by one to five halogen atoms, or represents an alkyl group containing 1 to 4 carbon atoms that is substituted by one to three hydroxyl groups, R 2  represents an unsubstituted alkyl group containing 1 to 4 carbon atoms or an alkyl group containing 1 to 4 carbon atoms that is substituted by one to five halogen atoms, or represents an alkenyl or alkynyl group containing 3 or 4 carbon atoms, a cyclohexyl group, an unsubstituted phenyl group or a phenyl group substituted by one to three alkyl groups each containing 1 to 3 carbon atoms, or represents a phenyl group substituted by one to three alkoxy groups each containing 1 to 3 carbon atoms, or represents a phenyl group substituted by one to three halogen atoms, or represents a benzyl group or a phenylethyl group, with the proviso that when R 1  represents a methyl group R 2  does not represent a methyl group, an unsubstituted phenyl group or a phenyl group substituted by one to three alkyl groups and that when R 1  represents an ethyl group R 2  does not represent an ethyl group or a phenyl group substituted by one to three alkyl groups, and R 3  represents an isopropyl or allyl group, or R 1  represents an ethyl or allyl group, R 2  represents an unsubstituted phenyl group or a phenyl group substituted by one to three alkyl groups each containing 1 to 3 carbon atoms, or represents a phenyl group substituted by one to three alkoxy groups each containing 1 to 3 carbon atoms, or represents a phenyl group substituted by one to three halogen atoms, with the proviso that when R 1  represents an ethyl group R 2  does not represent a phenyl group substituted by one to three alkyl groups, and R 3  represents a methyl or ethyl group. These compounds are useful as selective herbicides especially for cotton crops. Reference has been directed by the Comptroller to Specifications 1,197,788, 1,173,753 and 1,127,050.