Title:
PRODUCTION OF PHTHALIDE COMPOUND
Document Type and Number:
Japanese Patent JP3609621
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To economically obtain the subject compound capable of extremely rapidly reacting, not causing a waste water treatment problem after the reaction and useful as a coupler for color development type recording materials by performing the reaction in the presence of activated carbon.
SOLUTION: This method for producing a phthalide compound of formula II (R1-R6 are each an alkyl or the like) [e.g. 3,3-bis(4-dimethylaminophenyl)-6- dimethylaminophthalide] comprises oxidizing a triphenylmethane compound of formula I {e.g. 2-[4,4'-bis(dimethylamino)benzhydryl]-5-dimethylaminobenzoic acid} with an oxidizing agent, preferably one kind of compound selected from air, oxygen, hydrogen peroxide and the mixtures of oxygen with inactive gases in the presence of activated carbon in an aqueous solvent.
Inventors:
Nakao Kun
Mansuke Matsumoto
Yusei Nishimura
Masaru Wada
Yoshinobu Kanamura
Mansuke Matsumoto
Yusei Nishimura
Masaru Wada
Yoshinobu Kanamura
Application Number:
JP16671198A
Publication Date:
January 12, 2005
Filing Date:
June 15, 1998
Export Citation:
Assignee:
Yamamoto Kasei Co., Ltd.
Mitsui Chemicals, Inc.
Mitsui Chemicals, Inc.
International Classes:
C07D307/88; B01J21/18; C07B61/00; C09B11/18; C09B11/28; (IPC1-7): C07D307/88; B01J21/18; C09B11/18
Domestic Patent References:
| JP247160A | ||||
| JP62184061A | ||||
| JP55120562A |
Attorney, Agent or Firm:
Shinichi Naemura
Shotaro Mogami
Shotaro Mogami
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