Nippon Soda Co., Ltd.

Yasuyuki Miyazawa

Akihiro Takahashi

Akiyoshi Ueda

Takashi Kawana

Masami Koguchi

Yoshihiko Hara

Shiro Tsubokura

Mitsuru Takase

Compounds having one or more structures represented by general formula (I) as partial structure thereof, which are typified by pyrimidone and pyridone compounds, have two or more reaction sites in alkylation reactions. Accordingly, there is no process for producing O-alkylated products of these compounds at a high selectivity or such processes, if any, are applicable exclusively to those having limited structures. A process for selectivity O-alkylating such a compound as described above by converting it into the copper salt by using a monovalent copper compound such as copper suboxide and then reacting it with an alkylating agent having a leaving group in the presence of a phosphorus compound such as a phosphite. Pyrimidyloxy derivatives or pyridyloxy derivatives obtained by this reaction is useful as intermediates of pesticides or drugs.

Methods for highly selectively o-alkylating amide compounds with the use of copper salts

The present invention is directed to oxazole derivatives represented by the formula &lsqb;I&rsqb;;

Oxazole derivative, process for producing the same, and herbicide

The present invention is directed to oxazole derivatives represented by the formula [I]; ##STR1## wherein A represents a nitrogen atom or a R.sub.3 -substituted carbon atom;

Oxazole derivatives, process for producing the same, and herbicide

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Niigata, Japan

Yasuyuki Miyazawa