2-氯环己酮 、 1,2-丙二硫醇 以to give 5,6,7,8-tetrahydro-2-methyl-1,4-benzodithian as a greenish oil, bp 127°-130°/2.3 mm, Yield 66%的产率得到2-Methyl-2,3,5,6,7,8-hexahydro-1,4-benzodithiine
Regulation of the growth of plant life, including herbicidal, defoliant or desiccant effects, may be accomplished with certain 2,3-dihydro-1,4-dithiin 1,1,4,4-tetroxides of the formula ##STR1## wherein the R's have various values such as hydrogen, alkyl, etc. Certain of the compounds, such as 2,3-dihydro-5,6-dimethyl-1,4-dithiin 1,1,4,4-tetroxide, are new chemicals, and are useful as pre-and post-emergent herbicides, and in harvest aid procedures, such as defoliation/desiccation of various crops, including cotton and potatoes.
Method of making certain 2,3-or 5,6-dihydro-1,4-dithiins
申请人:UNIROYAL LIMITED
公开号:EP0053494A1
公开(公告)日:1982-06-09
A method of making certain 2,3-dihydro-1,4-dithiins of the following formula by the action of alpha-hydroxyketones (acy- loins) on 1,2-dithiols:
wherein R1 and R2 are hydrogen or alkyl having 1 to 6 carbon atoms or are joined together to form a ring with 3 or 4 methylene groups, and R3 and R4 are hydrogen or the same or different alkyl groups having 1 to 10 carbon atoms, which alkyl groups may be substituted with lower alkoxy groups.