http://rdf.ncbi.nlm.nih.gov/pubchem/patent/IE-43261-B1
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-657172 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-32 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-34 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-6574 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-6571 |
| filingDate | 1976-07-09-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1981-01-14-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | IE-43261-B1 |
| titleOfInvention | Continuous production of 2,5-dioxo-1-oxa-2-phospholanes |
| abstract | 1503848 Continuous production of 2,5-dioxo- 1-oxa-2-phospholanes HOECHST AG 7 July 1976 [12 July 1975] 28251/76 Heading C2P A process for the continuous production of a 2,5-dioxo-1-oxa-2-phospholane of the general formula from a beta-halogenoformyl-ethyl phosphinic acid halide of the general formula in which formulµ R1 stands for an alkyl radical having 1, 2, 3 or 4 carbon atoms, or a phenyl radical, R2 and R3 each stands for hydrogen or CH 3 , and X stands for chlorine or bromine, by reacting the said acid halide with acetic anhydride, comprises introducing, into a heatable circulation reactor of elongated form, an initial quantity of the desired 2,5-dioxo-1-oxa-2- phospholane and circulating it therein at a temperature of 110‹ to 190‹ C., separately preheating the respective beta-halogenoformylethyl phosphinic acid halide and acetic anhydride starting materials to a temperature of 60‹ to 160‹ C, mixing these starting materials together and continuously adding the resulting mixture to the material circulated in the reactor, the mixture being introduced into the lower third of the reactor; distilling off resulting acetyl chloride or bromide near the head of the circulation reactor, a pressure difference of 0À1 to 5 bars being established between the point of introduction of the mixture of starting materials and the overflow level in the circulation reactor, and the material being kept circulating by the evaporating acetyl chloride or bromide; and removing the resulting desired 2,5-dioxo-1-oxa- 2-phospholane from the reactor at a location which is below that at which the acetyl chloride or bromide is distilled off. Examples are given for the production of 2-methyl and 2-phenyl-2,5- dioxo - 1 - oxa - 2 - phospholane and suitable apparatus for carrying out the process is described with reference to a drawing (not shown). |
| priorityDate | 1975-07-12-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 40.