PREPARATION OF 5,6-DIHYDRO-2H-THIOPYRAN-3- CARBOXALDEHYDES

    公开(公告)号:CA1256886A

    公开(公告)日:1989-07-04

    申请号:CA487427

    申请日:1985-07-24

    Applicant: BASF AG

    Abstract: - 9 - O.Z. 0050/37242 5,6-Dihydro-2H-thiopyran-3-carboxaldehydes of the formula where R denotes hydrogen or methyl, are prepared by a method in which acrolein or crotonaldehyde is reacted with hydrogen sulfide in a mineral oil whose boiling point is higher than those of the starting materials and of the end product, and the 5,6-dihydro-2H-thiopyran-3-carboxaldehyde is obtained by distillation. These aldehydes are important intermediates for the preparation of some crop protection agents.

    PREPARATION OF 5-HYDROXYMETHYLIMIDAZOLES

    公开(公告)号:CA1134839A

    公开(公告)日:1982-11-02

    申请号:CA346104

    申请日:1980-02-19

    Applicant: BASF AG

    Abstract: The invention is concerned with a process for the preparation of a 5-hydroxymethylimidazole of the formula 1 1 where R1 is hydrogen or alkyl of 1 to 18 carbon atoms, phenyl, benzyl or .beta.-phenylethyl, and R2 is alkyl of 1 to 18 carbon atoms or phenyl, wherein an imdazole of the formula 2 2 where R1 and R2 have the meanings given for formula 1, is reacted with formaldehyde or an oligomer of formaldehyde is aqueous hydrochloric acid solution, containing from 5 to 18% by weight of hydrogen chloride, at from 80.degree. to 160.degree.C, if appropriate in a closed system under pressure, the resulting 5hydroxymethylimidazole is isolated in the form of its hydrochloride and the ratio of imidazole to hydrogen chloride being from 1:1.5 to 1:5. The process according to the present invention is particularly usable to prepare 5-hydroxymethylimidazoles in a very simple manner, and in a form free from by-products, on an industrial scale.

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