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| Number | Title | Issue Date |
| 6420592 | Amino acid-derived phosponamidic anhydrides and methods of preparing the same Phosphonamide compounds and methods of forming those compounds are provided. The inventive methods comprise forming a template opened-ring phosphonamide compound and optionally subjecting the template to a ring-closing metathesis reaction in the presence ... | 07/16/2002 |
| 5710330 | Process for preparing alkanephosphonic anhydrides Process for preparing alkanephosphonic anhydrides of the formula (I) ##STR1## where R is straight-chain or branched unsubstituted C1 -C6 -alkyl and nࣙ3, which comprises pyrolytically eliminating water from an alkanephosphonic ... | 01/20/1998 |
| 5576454 | Process for preparing alkanephosphonic anhydrides Process for preparing phosphonic anhydrides of the formula (I) ##STR1## in which R is (C1 -C10)-alkyl which is unsubstituted or substituted by alkyl groups, alkoxy groups, fluorine, chlorine or bromine atoms, nitro groups, cyano... | 11/19/1996 |
| 5319138 | Process for the preparation of pure propanephosphonic anhydride Process for the preparation of pure propanephosphonic anhydride, which comprises distilling crude, impure propanephosphonic anhydride having an average degree of polymerization of 20 to 200 and containing less than 0.5% by weight of water by heating to 23... | 06/07/1994 |
| 4751028 | Process for the preparation of thiophosphinic chlorides A process for the production of a chloride of thiophosphinic acids which comprises reacting an anhydride of a phosphinic acid with thiophosphoryl chloride.... | 06/14/1988 |
| 4486357 | Process for making vinylphosphonic acid or vinylpyrophosphonic acid The disclosure relates to process for making derivatives of vinylphosphonic acid or vinylpyrophosphonic acid. To this end, a ketone is reacted with tetraphosphorus hexoxide in the presence of catalytic proportions of a proton-yielding substance. In the ev... | 12/04/1984 |
| 4267125 | Process for the manufacture of phosphinic and phosphonic acid anhydrides Process for the manufacture of phosphinic and phosphonic acid anhydrides by reacting phosphinic and phosphonic acid halides with an aliphatic carboxylic acid anhydride and removing the carboxylic acid halide having been formed by distillation.... | 05/12/1981 |
| 4196141 | Bisphosphinic acid anhydrides and process for their preparation Bisphosphinic acid anhydrides of the formula ##STR1## in which R is a saturated open chain or cyclic alkylene radical, an arylene or aralkylene radical, and R1 and R2, which may be identical or different, represent optionally ha... | 04/01/1980 |
| 4195035 | Alkane-bisalkyl-phosphinic anhydrides and process for the manufacture of alkane-phosphonic anhydrides and alkane-bis alkyl-phosphinic anhydrides Alkane-bisalkylphosphinic anhydrides consisting of repeating units of the formula ##STR1## and process for the manufacture of alkane-phosphonicanhydrides and alkane-bisalkyl-phosphonic anhydrides consisting of repeating units of the formula ... | 03/25/1980 |
| 4108889 | Preparing alkane phosphonic acids and intermediates Preparation of long chain alkane phosphonic acids involves reacting alpha olefin with macroreticular strong acid cation exchange resin to isomerize the olefin, reacting resulting internally unsaturated olefin with dimethylphosphite to produce non-terminal... | 08/22/1978 |
| 4081463 | Production of 2-carboxyethyl(phenyl)phosphinic acid 2-Carboxyethyl(phenyl)phosphinic acid is prepared in two stages by first reacting dichloro(phenyl)phosphine with acrylic acid employed at a molar excess of 25% to 45% to form a mixture of three intermediates, namely 3-(chlorophenylphosphinyl)propionyl chl... | 03/28/1978 |
| 3989525 | H-isopropyl-2-chloroethane-(thiono)-phosphonic acid ester amide compounds and herbicidal compositions New N-isopropyl-2-chloroethane-(thiono)-phosphonic acid ester amides of the general formula: ##EQU1## wherein X is oxygen or sulfur, and R is acetyl or a group of the formula ##EQU2## wherein X' is oxygen or sulfur, R' is alkoxy with 1 to 4 carb... | 11/02/1976 |
| 3972866 | Polymerization process An olefine polymerization catalyst includes a complex compound of phosphorus having the general formula ##EQU1## where the various groups are defined. Typical phosphorus compounds include ##EQU2## Catalyst systems containing these phosphorus com... | 08/03/1976 |
