Sumitomo Chemical Company, Limited

Japan Energy Corporation

Yoo Tanabe

Noritada Matsuo

Masachika Hirano

Kazunori Tsushima

Toshihiko Yano

Hitomi Yamamoto

Atsushi Makita

Masanari Murakami

Disclosed are a process of subjecting a diester of a long-chain dicarboxylic acid having 18 to 21 carbon atoms to intramolecular condensation in the presence of titanium tetrachloride or zirconium tetrachloride and a trialkylamine to form an &#x3b1;-alkoxycarbonylated macrocyclic ketone, and a process for producing a macrocyclic ketone by hydrolyzing an &#x3b1;-alkoxycarbonylated macrocyclic ketone obtained by the process and then subjecting the hydrolyzate to decarboxylation. The invention provides a process for producing a macrocyclic ketone efficiently, which permits high concentration synthesis.

Processes for the preparation of macrocyclic ketones

Disclosed is a process for producing 3-hydroxymethyl-1-propargylimidazolidine-2,4-dione which comprises

Process for producing 3-hydroxymethyl-1-propargylimidazolidine-2,4-dione

An ether compound represented by the following general formula (I), its produciton method and an insecticidal and/or acaricidal composition containing it as an active ingredient: ##STR1## wherein R.sub.1 and R.sub.2, which may be identical or different, represent a hydrogen or halogen atom or a lower alkyl, lower haloalkyl, lower alkoxyl, lower haloalkoxyl, lower alkenyl or lower alkenyloxyl group, or represent, taken together, methylenedioxy, lower alkylene, ethyleneoxy or lower alkylethyleneoxy group; R.sub.3 represents a hydrogen or fluorine atom; R.sub.4 represents a hydrogen or halogen atom or a lower alkyl, lower haloalkyl, lower alkoxyl or lower haloalkoxyl group; m represents an integer of 1 or 2; Y represents an oxygen or sulfur atom or a group represented by the formula --CH.sub.2 -- or --NH--; and Z represents a nitrogen atom or a group represented by the formula --CH.dbd., and its starting materials.

Novel ether compound, a process for manufacturing the same, a

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Nishinomiya, Japan

Yoo Tanabe