Process of the preparation of high-purity alkyladamantyl esters
AssigneeTokuyama Corporation
InventorsHiromasa Yamamoto, Masao Yamaguchi, Yoshihiro Hirota, Takashi Kobayakawa
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Abstract
There is provided a method for obtaining an alkyladamantyl ester efficiently by distilling and purifying a crude alkyladamantyl ester containing impurities which decompose the alkyladamantyl ester without decomposing the alkyladamantyl ester. The crude alkyladamantyl ester such as crude 2-methyl-2-adamantyl methacrylate is distilled in the presence of a heterocyclic compound and/or a basic compound such as 3-ethyl-3-hydroxymethyloxetane or diglycidyl bisphenol A.
Claims12
(Amemded) A method for producing a high purity alkyladamantyl ester which comprises the steps of esterifying an adamantane compound having an —OH group, —OM group or ═R group (wherein M is an alkali metal atom or MgX (wherein X represents a halogen atom), and R is a divalent aliphatic hydrocarbon group) and distilling a crude alkyladamantyl ester obtained to form a high purity alkyladamantyl ester, wherein the distillation is carried out in the presence of a heterocyclic compound which has, in a molecule, at least one saturated three-to-five-membered heterocyclic ring having at least one hetero atom selected from the group consisting of oxygen, nitrogen, sulfur, selenium and silicon.
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(Amended) An alkyladamantyl ester composition comprising 100 parts by weight of alkyladamantyl ester and 0.0001 to 100 parts by weight of heterocyclic compound which has, in a molecule, at least one saturated three-to-five-membered heterocyclic ring having at least one hetero atom selected from the group consisting of oxygen, nitrogen, sulfur, selenium and silicon.
Dependencies are inferred from the claim text.