http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-780714-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_d8d640c977dee9ec1b4cf792d12d5223 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/A01N47-20 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/A01N47-20 |
| filingDate | 1953-12-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_cc4db77224ef7bbfc92a7bcfa864eff3 |
| publicationDate | 1957-08-07-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-780714-A |
| titleOfInvention | Improvements in or relating to herbicidal compositions containing carbamic acid esters and preparation thereof |
| abstract | A method of preparing an isopropyl N-chlorophenyl carbamate by reaction of an isopropyl haloformate and a chloroaniline in the presence of a hydrogen halide acceptor comprises establishing a liquid body containing the chloroaniline and simultaneously and individually adding the isopropyl haloformate and the hydrogen halide acceptor to the liquid body under such conditions of temperature and pressure that reaction takes place. Isopropyl chloroformate is generally used, although bromo, fluoro and iodoformates and mixtures of these are referred to. Chloroanilines mentioned are o-, m- and p-chloroanilines, 2,3- and 2,5-dichloroaniline, 2,4,6-trichloroaniline and tetra-and pentachloroanilines. The reaction may be effected in the presence of solvents, e.g. of specific gravity 0.8 or 1.2, such as carbon tetrachloride, chloroform, ethylene dichloride, perchloroethylene, benzene, xylene, toluene, or acetone. Reaction temperatures of 0 DEG to 15 DEG C. are suitable. In examples: (1) isopropyl chloroformate and excess aqueous sodium hydroxide are added simultaneously to m-chloroaniline kept at 0 DEG to 10 DEG C., the isopropyl N - 3 - chlorophenyl carbamate obtained being washed in benzene solution with hydrochloric acid; (2) excess isopropyl chloroformate and excess sodium hydroxide are added to a mixture of m-chloroaniline and water. The product is extracted with perchloroethylene and treated with additional isopropyl chloroformate to reduce the amount of m-chloroaniline impurity; (3) a similar large-scale reaction is effected, additional sodium hydroxide and isopropyl chloroformate being added until no chloroaniline is present, the product being washed in solution with hydrochloric acid followed by distillation of the perchloroethylene. |
| priorityDate | 1953-12-25-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 58.