Birch, Stewart, Kolasch & Birch, LLP
Process for the preparation of alicyclic ketones and an alkyl-substituted alicyclic esters
A high-purity alicyclic ketone which is a raw material for an alkyl-substituted alicyclic ester such as an alkyl adamantyl ester compound which is useful as a resist raw material can be obtained by a simple operation such as extraction without a special purification step such as distillation or recrystallization. In this process, when an alicyclic hydrocarbon is oxidized with concentrated sulfuric acid or fuming sulfuric acid, the reaction solution after oxidation is poured into water and a solid is extracted with an organic solvent, the concentration of sulfuric acid in the water layer at the time of extraction is adjusted to 60 to 90 wt % to carry out extraction so as to obtain an alicyclic ketone.
Tokuyama Corporation
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inventional inventional additional inventional
Masao Takashi Hideki Atsushi Hiromasa Yoshihiro
Yamaguchi Matsumura Kikuchi Kadokura Yamamoto Hirota