PRODUCTION OF GLUTARALDEHYDE MONOACETAL

    公开(公告)号:JP2000038384A

    公开(公告)日:2000-02-08

    申请号:JP22371398

    申请日:1998-07-23

    申请人: DAICEL CHEM

    摘要: PROBLEM TO BE SOLVED: To obtain the subject monoacetal compound in a high yield by specifying an initial distillation temperature on isolating glutaraldehyde monoacetal by a distillation from a crude reaction liquid obtained after reacting dihydropyranes with a diol. SOLUTION: This glutaraldehyde monoacetal of formula II is obtained by reacting 2-Y-3, 4-dihydro-2H-pyrane of formula I (Y is hydroxy, an alkoxy or the like) or its nuclear-substituted derivative with a diol of the formula: HOROH [R is a 1-10C (un) saturated hydrocarbon], (suitably ethylene glycol or 1, 2-propylene glycol). In isolating the compound of the formula II after the reaction, an initial distillation operation for removing a low boiling component from the crude reaction liquid, is conducted while maintaining the temperature of the distillation bottom liquid at 100-200 deg.C, preferably at 130-180 deg.C. The reaction of the compound of the formula I with the diol, is preferably performed by using a sulfonic acid type cation exchange resin as a catalyst at 30-150 deg.C. The distillation of the crude reaction liquid is preferably performed after the removal of the catalyst.

    ALPHA-SULFINYL KETONE COMPOUND AND ITS PRODUCTION

    公开(公告)号:JPH09316048A

    公开(公告)日:1997-12-09

    申请号:JP13620696

    申请日:1996-05-30

    发明人: YU TAKESHI

    摘要: PROBLEM TO BE SOLVED: To obtain the subject new compound useful as an intermediate for agrochemicals, etc., in high yield by irradiating a specific compound and an oxygen-contg. compound with light in the presence of an aryl ketone compound. SOLUTION: This new compound is shown by formula I [R and R are each a (substituted) 1-6C alkyl or (substituted) aryl; R and R are each H or a 1-6C alkyl; X is H, a 1-6C alkyl or OR (R is H or a 1-6C alkyl); Ar is a (substituted) aryl], e.g. 4-ethylenedioxymethyl-3-(p-tolylsulfinyl)-2-pentanone. This compound of formula I is obtained by irradiating an α-sulfinyl enone compound of formula II [e.g. 3-p-tolysulfinyl)-3-penten-2-one] and an oxygen- contg. compound of formula III (e.g. methanol) with light using e.g. a mercury vapor lamp in the presence of an aryl ketone compound (e.g. benzophenone).