Patents

Description

PROCEDEU DE OBTINERE A UNOR DERIVATI DE PIRAZOL SI INTERMEDIARI OBTINUTI IN ACEST PROCEDEU

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Interest:

Assignment

Publication info:

No.: RO118534

Date: 30.06.2003

Inventor(s):

HAWKINS DAVID WILLIAM [GB]

ROBERTS DAVID ALAN [GB]

WILKINSON JOHN HARRY [GB]

CLAVEL JEAN-LOUIS [FR]

Applicant(s):
RHONE POULENC AGROCHIMIE [FR]
Classification:
International patent classification (IPC):
C07C253/00; C07C253/04; C07C255/19; C07C255/65; C07D213/76; C07D213/77; C07D231/38; C07D401/04
Cooperative patent classification (CPC):
C07C253/00 (KR); C07C253/16 (EP, US); C07C255/19 (KR); C07D213/77 (EP, US); C07D231/38 (EP, KR, US); C07D401/04 (EP, US); C07C253/16; C07C255/19
Application info:
No.: RO19980001349
Date: 03.03.1997
Priority number(s):
GB19960004691 05.03.1996 ; WO1997EP01036 03.03.1997
Related patents:
AR006058; ATE212332; AU1924897; AU725472; BG102788; BG63664; BR9707811; CN1137090; CN1213366; CN1495168; CZ280998; CZ293415; DE69710052; DK0888291; EA000955; EA199800792; EP0888291; ES2166977; HRP970128; HU228635; HU9902473; ID17221; IL126054; IN186421; JP2000511879; JP4039693; KR100530974; KR19990087445; MY116862; NZ331670; PL187340; PL328778; PT888291; RS49587; TR199801751; TW574185; UA57729; US6133432; WO9732843; YU38798; ZA971855
Description:

Inventia se refera la un procedeu de obtinere a unor derivati de pirazol, cu formula generala I, utilizati in sinteza pesticidelor, constand in reactia unui cianoacetat cu o cianura sau formaldehida sau un precursor de formaldehida, reactia intermediarului, cu formula III, format, cu o sare de diazoniu si, in final, ciclizarea intermediarului cu formula V. Derivatii de pirazol se obtin direct, cu mare puritate, fara utilizarea formaldehidei cianhidrice si cu evitarea formarii dimerilor.

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