1.
    发明专利
    未知

    公开(公告)号:DE2609864A1

    公开(公告)日:1977-09-15

    申请号:DE2609864

    申请日:1976-03-10

    Applicant: BASF AG

    Abstract: 3-Amino-1,2-benzisothiazoles are manufactured by reacting o-halobenzonitriles with ammonia and elementary sulfur. The products are fungicides and starting materials for the manufacture of dyes, crop protection agents and pharmaceuticals.

    Fungicidal benzodithiole-thione prepn - viz 5-nitrobenzo-1,2-dithiole-3-thione, from 2-halo -5-nitro-benzyl halides and sulphur

    公开(公告)号:DE2460783A1

    公开(公告)日:1976-07-01

    申请号:DE2460783

    申请日:1974-12-21

    Applicant: BASF AG

    Abstract: 5-Nitrobenzo-1,2-dithiole-3-thione of formula (I) is prepd. by reacting a 2-halo-5-nitrobenzyl halide of formula (II) with sulphur in the presence of a base at 20-100 degrees C, as follows: (where each X is independently halogen). (I) has fungicidal activity and is useful as an intermediate for plant-protection agents, pharmaceuticals and dyes. The process is simple and gives high yields (e.g. 70-90%). The starting material is pref. 2-chloro-5-nitrobenzyl chloride (IIa), which can be prepd. by nitrating 2-chlorobenzyl chloride. The base is pref. a tert. amine or an alkali metal alcoholate. The reaction is pref. effected in an inert solvent, esp. an alcohol or ether.

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