http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-1457432-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_5c24684033fba97d1ad845ce453a57e3 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07F9-42 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07F9-42 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/B01J31-00 |
| filingDate | 1973-12-04-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1976-12-01-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-1457432-A |
| titleOfInvention | Preparation of halogenomethane-phosphonic acid dihalides |
| abstract | 1457432 Preparing halomethane phosphonic acid dihalides HOECHST AG 4 Dec 1973 [5 Dec 1972] 56088/73 Heading C2P A halomethylphosphonic dihalide wherein X is a halogen atom, e.g. Cl or Br, is obtained by reacting hydroxymethyl phosphonic acid: HO.CH 2 P(O)(OH) 2 or a salt, a functional derivative or a thioanalog thereof, preferably at 65 to 200 C., with an acid halide (CO) n X 2 wherein n is 1 or 2 in the presence of a catalyst which is either (1) a compound having at least one trivalent or pentavalent N or P atom bonded via one double bond and at least one single bond to at least two organic radicals, or bonded via at least three single bonds to at least 3 organic radicals each of the said organic radicals having not more than 20 carbon atoms, or (2) a fully amidated monobasic, dibasic or tribasic organic or inorganic acid of trivalent or pentavalent phosphorus in which any organic radical bonded to the P atom has not more than 20 carbon atoms and all substituents on amido nitrogen atoms are aliphatic radicals each having not more than 20 carbon atoms, there being at least one such substituent present. Specified acid halides are COCl 2 , COBr 2 , Oxalyl chloride and oxalyl bromide. The functional derivative of the hydroxymethyl phosphonic acid may be diesters, monoesters and their salts, pyrophosphonic acid esters and thioanalogues of such compounds, the free acid, its salts e.g. alkali metal or ammonium salts, the di(C 1 -C 6 alkyl)- esters being preferred. The reaction is optionally carried out in an inert solvent including toluene, diphenylmethane and various specified chlorohydrocarbons or preferably the final reaction product itself. Specified types of catalyst are tertiary amines, tertiary phosphines (including cyclic phosphines), azomethines, quaternary ammonium and phosphonium salts, heterocyclic amines of aromatic character, acid amides, pyridine N-oxide, acyclic and cyclic tertiary phosphine oxides, amides of phosphinic and phosphonic acids and of their thio analogues and triamides of phosphoric and thiophosphoric acids. In examples ClCH 2 P(O)Cl 2 is obtained by reacting or its diethyl ester with COCl 2 in the presence of pyridine. |
| priorityDate | 1972-12-05-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 37.