92.
    发明专利
    未知

    公开(公告)号:ES2058181T3

    公开(公告)日:1994-11-01

    申请号:ES88109085

    申请日:1988-06-08

    Applicant: BASF AG

    Abstract: The preparation of 5-formylvaleric esters comprises the following steps… a) hydroformylation of pentenoic esters by reaction with carbon monoxide and hydrogen at elevated temperature and pressure in the presence of carbonyl complexes of metals from Group VIII of the Periodic Table with the formation of a mixture of 5-, 4- and 3-formylvaleric esters… b) separation of 5-formylvaleric esters from the mixture thus obtained of 5-, 4- and 3-formylvaleric esters, leaving a mixture substantially comprising 4- and 3-formylvaleric esters behind… c) cleavage of the mixture substantially comprising 4- and 3-formylvaleric esters to give pentenoic esters at a temperature of 50 to 400 DEG C in the presence of catalysts and… d) recycling of the pentenoic esters into step a.

    93.
    发明专利
    未知

    公开(公告)号:DE59006008D1

    公开(公告)日:1994-07-14

    申请号:DE59006008

    申请日:1990-08-03

    Applicant: BASF AG

    Abstract: Process for the preparation of dialkyl carbonates of the general formula I in which R represents a C1- to C10-alkyl group, by reacting the alcohols R OH with a gaseous carbon monoxide/oxygen mixture in the presence of a copper catalyst and of a cosolvent, at increased temperature and under increased pressure, in which the cosolvent used is a cyclic urea of the general formula II in which n is the number 2, 3 or 4 and R represents hydrogen or a C1- to C4-alkyl group.

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