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    PROCESS FOR PREPARING PYRAZOLE AND DERIVATIVES THEREOF
    2.
    发明专利
    PROCESS FOR PREPARING PYRAZOLE AND DERIVATIVES THEREOF 未知

    公开(公告)号：CZ52096A3

    公开(公告)日：1996-05-15

    申请号：CZ52096

    申请日：1994-08-13

    Applicant: BASF AG

    Inventor： MERKLE HANS DR ,  FRETSCHNER ERICH

    IPC: C07B35/04 ,  C07D231/12 ,  C07D521/00

    Abstract: PCT No. PCT/EP94/02708 Sec. 371 Date Feb. 15, 1996 Sec. 102(e) Date Feb. 15, 1996 PCT Filed Aug. 13, 1994 PCT Pub. No. WO95/06036 PCT Pub. Date Mar. 2, 1995A process for preparing pyrazole and its derivatives of the formula I I where R1, R2, R3 and R4 are each hydrogen, halogen, nitro, carboxyl, sulfonyl or C-organic radicals, from alpha,beta-unsaturated carbonyl compounds of the formula II II and hydrazine or hydrazine derivatives of the formula III H2N-NHR4 III wherein, initially without additional diluent, an alpha,beta-unsaturated carbonyl compound of the formula II is reacted with hydrazine or a hydrazine derivative of the formula III, and the resulting reaction mixture is reacted in another step with a mixture of sulfuric acid and iodine or a compound which liberates iodine or hydrogen iodide.

    Process for preparing pyrazole and derivatives thereof
    8.
    发明专利
    Process for preparing pyrazole and derivatives thereof 未知

    公开(公告)号：CZ288738B6

    公开(公告)日：2001-08-15

    申请号：CZ52096

    申请日：1994-08-13

    Applicant: BASF AG

    Inventor： MERKLE HANS DR ,  FRETSCHNER ERICH

    IPC: C07B35/04 ,  C07D231/12 ,  C07D521/00 ,  C07D401/04

    Abstract: In the present invention there are disclosed a process for preparing pyrazole and its derivatives of the general formula I in which Re1, Re2, Re3 and Re4 being independent on each other represent specific meanings, from {alpha},{beta}-unsaturated carbonyl compounds of the general formula II and hydrazine or hydrazine derivatives of the general formula III whereby the invented preparation process is characterized in that initially without addition of a diluent and in absence of sulfuric acid as a reaction medium, an {alpha},{beta}-unsaturated carbonyl compound of the general formula II is reacted with hydrazine or a hydrazine derivative of the general formula III, and the resulting reaction mixture is then reacted in the next reaction step with a mixture of sulfuric acid and iodine or a compound, which liberates iodine or hydrogen iodide.

    PROCESS FOR PREPARING N-SUBSTITUTED PYRAZOLES
    9.
    发明专利
    PROCESS FOR PREPARING N-SUBSTITUTED PYRAZOLES 未知

    公开(公告)号：CZ268697A3

    公开(公告)日：1997-12-17

    申请号：CZ268697

    申请日：1996-02-27

    Applicant: BASF AG

    Inventor： MERKLE HANS DR ,  FRETSCHNER ERICH ,  SCHRODER JURGEN DR

    IPC: C07D231/12 ,  C07D521/00

    Abstract: PCT No. PCT/EP96/00790 Sec. 371 Date Aug. 20, 1997 Sec. 102(e) Date Aug. 20, 1997 PCT Filed Feb. 27, 1996 PCT Pub. No. WO96/27589 PCT Pub. Date Sep. 12, 1996A process for the preparation of an N-alkyl- or N-phenylalkyl-substituted pyrazole I by reacting the corresponding N-unsubstituted pyrazole II with an alcohol III of the formula R1-OH where R1 is the same alkyl or phenylalkyl group to be added to the unsubstituted nitrogen group -NH- of the pyrazole reactant. Both of the reactants, i.e. the pyrazole II and alcohol III compounds, are catalytically reacted in the liquid phase in a molar ratio of from 0.001:1 to 1:1, at temperatures of 50 DEG -400 DEG C. and under a subatmosheric pressure of from 0.8 bar up to a superatmospheric pressure of 250 bar. The catalyst required for this liquid phase reaction is selected as being at least one or more non-heterogeneous acid catalysts, their alkyl esters or their acid anhydrides.

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