PROCESS FOR THE PREPARATION OF DIFLUORBENZO-1,3-DIOXOLES

摘要

The reaction of 2,2-difluorobenzo-1,3-dioxol with (a) an alkali metal or an alkali metal compound and then with (b) a compound R<1>-Z<1> where Z<1> has the meaning of a leaving group, or an aldehyde, gives compounds of the formula I in which R<1> represents -OH, -SH, -CHO, -CN, -COOH, -B(OH)2, -COX where X represents Cl or Br, furthermore -COOR<2>, -SiR@ or -B(OR<2>)2 where R<2> has the meaning of a C1-C12-alcohol radical minus the hydroxyl group, in which R1 furthermore represents -CnH2nCOOR<2> where n has the meaning of a number from 1 to 4, or linear or branched C1-C12-hydroxyalkyl which is unsubstituted or substituted by -F, -CN, C1-C6-alkoxy, phenyl, fluorophenyl, C1-C4-alkoxyphenyl, C1-C4-alkylthiophenyl, C1-C4-alkylphenyl, C1-C4-fluoroalkylphenyl, nitrophenyl or cyanophenyl, or in which R1 represents a benzyl alcohol which is unsubstituted or substituted by F, C1-4-alkoxy, -alkylthio, -alkyl, -fluoroalkyl, nitro or cyano, or is C1-C12-acyl, or in which R1 represents a radical of the formula II in which R<5> represents -CN, -CF3, -COOR<2>, -CONH2, -CO-NHR<2> or -CONR@, R<3> and R<4> represent a direct bond or in each case represent H, or R<3> is H and R<4> independently has the meaning of R<5>, or R<3> and R<4> together represent -CH2-NR<6>-CH2-, -CH2-NR<6>-CO- or -CO-NR<6>-CO- where R<6> is the radical of a protective group which can be eliminated, or where, furthermore, R<1> represents a radical of the formula III Insecticides or fungicides can be prepared from the compounds of the formula I.