| 摘要 |
NEW MATERIAL:A compound of formula I (X is O or S; R is halogen or lower alkyl; n is 1 ow 2). EXAMPLE:2-Naphthyl N-(6-methyl-2-pyridyl)-N-methylcarbamate. USE:A herbicide in paddy fields. PREPARATION:A naphtol derivative of formula II (Y is H, halocarbonyl or halothiocarbonyl) is reacted with an aminopyridine derivative of formula III (Z is halocarbonyl or halothiocarbonyl when Y is H, and H when Y is halocarbonyl or halothiocarbonyl) in the presence of a dehydrohalogenating agent, e.g. an alkali hydroxide, alkali carbonate or tertiary amine, at 0-150 deg.C to give the aimed compound of formula I .
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