NEW MATERIAL:The compound of formula 1 (R1 is H or halogen; R2 is halogen; R3 is H or 1W8C straight or branched alkyl which may be substituted with lower alkoxy; X and Y are O or S; n is 3W6).
EXAMPLE: 1,2-Trimethylene-4-(2-fluoro-4-chloro-5-ethoxycarbonylphenyl)-urazole.
USE: A herbicide exhibiting excellent herbicidal activity at a low rate of application, and especially effective to the broad-leaved weeds, annual weeds, perennial weeds, etc. e.g. Deccan grass of paddy field, or weeds of Amarant haceae family, Chenopodiaceae family, Polygonaceae family, etc.
PROCESS: The compound of formula 1 is prepared by reacting the compound of formula 2 with the compound of formule 3 (R4 is lower alkyl), reacting the resultant compound of formula 4 with the compound of formula 5 to obtain the compound of formula 6, and cyclizing the product by heating and refluxing in an inert solvent or by heating in the presence of a base.
KOBAYASHI SHINICHI
YANAGI MIKIO
YAMADA KURA
SHIDA ATSUHIKO
NITANI FUMIO
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