| 摘要 |
Insecticidal title compds.(I; R =halogen, alkyl, nitro ; n = 1-5) were prepd. by reaction of 6-amino-2,2,4,4-tetrafluoro-benz-1,3-dioxine(II) and substituted benzoylisocyanate (III), or 6-isocyanate-2,2,4,4-tetrafluoro- benz-1,3-dioxine and substituted benzimide(IV). Thus, 5.5 g(0.03 mol) II(Rn = 2,6-difluoro) in 20 ml C6H5CH3(V) was added to 6.7g(0.03 mol) II in 100 ml V at 60≦̸C and was stirred for 1 hr to give 8 g I(Rn = 2,6-difluoro) (m.p.; 231≦̸C).
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