| 摘要 |
A method for synthesis of N-phosphonoalkyliminodiacetic acid or derivatives thereof by: 1) forming a reaction mixture having an acid catalyst, a compound having the general formula R1—CH2—NX—CH2—R2 and a compound having one or more P—O—P anhydride moieties, to form a compound having the general formula R1—CH2—N—CH2(PO3H2)—CH2—R2, its dehydrated forms or their derivatives, wherein the compound of the formula R1—CH2—NX—CH2—R2 is characterized in that: X is —CH2—OH or —CH2—COOH; and R1 and R2 are independently selected from the group consisting of nitrile, C1-C4 alkyl carboxylate, or are both carbonyl groups linked by a hydrogen substituted nitrogen atom or a C1-C4-akyl substituted nitrogen atom; the P—O—P anhydride compound is characterized in that the anhydride moieties have one P atom at the oxidation state (+III) and one P atom at the oxidation state (+III) or (+V); and 2) hydrolysing the reaction mixture to form N-phosphonomethyliminodiacetic acid or one of its derivatives. |
