Process for the preparation of...

Organic compounds -- part of the class 532-570 series – Organic compounds – Phosphorus acids or salts thereof

Reexamination Certificate

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C562S008000, C562S011000

Reexamination Certificate

active

07009071

ABSTRACT:
This invention is related with the preparation of 4-amino-1-hydroxybutylidene-1,1-biphosphonic acid or salts thereof. The reaction of 4-aminobutyric acid with phosphorous acid and phosphorus trichloride in the presence of aralkyl or alkyl ethoxylates or triglycerides such as plant or animal oils or their derivatives; and recovering of 4-amino-1-hydroxybutylidene-1,1-biphosphonic acid or salts thereof are described. The main feature of the invention is in the use of the above defined non-ionic emulgators in the phosphonylation reaction.

REFERENCES:
patent: 4407761 (1983-10-01), Blum et al.
patent: 4624947 (1986-11-01), Blum et al.
patent: 4705651 (1987-11-01), Staibano
patent: 4922007 (1990-05-01), Kieczykowski et al.
patent: 5019651 (1991-05-01), Kieczykowski
patent: 5162310 (1992-11-01), Jaeggi
patent: 5908959 (1999-06-01), Kubela et al.
patent: 6201148 (2001-03-01), Lidor-Hadas et al.
patent: WO 98 34940 (1998-08-01), None

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