Patents Assigned to Charna Chemicals Ltd.
  • Patent number: 7928268
    Abstract: The present invention relates to a process for producing a 2-fluoro-6-halophenol as an intermediate; a process for producing a 2-alkoxy-3-fluorophenol and further a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; a second process for producing a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; and a 2-alkoxy-3-fluorophenol. The 2-fluoro-6-halophenol can be obtained using a 2-fluorophenol as a starting material and through a sulfonation reaction, a halogenation reaction, and a deprotection reaction. The 2-fluoro-6-halophenol is alkyl-etherified, and subsequently the halogen atom is converted into a hydroxyl group to obtain the 2-alkoxy-3-fluorophenol, which is further alkyl-etherified to thereby obtain the 1,2-dialkoxy-3-fluorobenzene. Alternatively, a 1,2-dialkoxy-3-fluorobenzene is also obtained by converting the halogen atom of the 2-fluoro-6-halophenol into a hydroxyl group to thereby form 3-fluorocatechol and subsequently alkyl-etherifying two hydroxyl groups thereof.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: April 19, 2011
    Assignees: Asahi Glass Company, Limited, Charna Chemicals Ltd.
    Inventors: Mingjian Qiu, Wei Zhang, Zhaohui Chen, Chunshan Zhang, Yali Zhang
  • Patent number: 7786330
    Abstract: The present invention relates to a process for producing a 2-fluoro-6-halophenol as an intermediate; a process for producing a 2-alkoxy-3-fluorophenol and further a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; a second process for producing a 1,2-dialkoxy-3-fluorobenzene from the 2-fluoro-6-halophenol; and a 2-alkoxy-3-fluorophenol. The 2-fluoro-6-halophenol can be obtained using a 2-fluorophenol as a starting material and through a sulfonation reaction, a halogenation reaction, and a deprotection reaction. The 2-fluoro-6-halophenol is alkyl-etherified, and subsequently the halogen atom is converted into a hydroxyl group to obtain the 2-alkoxy-3-fluorophenol, which is further alkyl-etherified to thereby obtain the 1,2-dialkoxy-3-fluorobenzene. Alternatively, a 1,2-dialkoxy-3-fluorobenzene is also obtained by converting the halogen atom of the 2-fluoro-6-halophenol into a hydroxyl group to thereby form 3-fluorocatechol and subsequently alkyl-etherifying two hydroxyl groups thereof.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: August 31, 2010
    Assignees: Asahi Glass Company, Limited, Charna Chemicals, Ltd.
    Inventors: Mingjian Qiu, Wei Zhang, Zhaohui Chen, Chunshan Zhang, Yali Zhang
  • Patent number: 6623732
    Abstract: This invention discloses a pharmaceutical formulation for nasal administration which contains a pharmaceutically active polypeptide and a method producing the pharmaceutical formulation. The pharmaceutical for formulation comprises: (1) a pharmaceutically active polypeptide, (2) at least one compound selected from the group consisting of taurine, an ester thereof with C1˜6 alcohol, a base metal salt of taurine, hyaluronic acid and a base metal of hyaluronic acid and (3) at least one pharmacologically acceptable additive. It exhibited excellent pharmaceutical activity. No adverse effects such as irration were observed and hence, the present pharmaceutical formulation may suitably be administered nasal mucosa.
    Type: Grant
    Filed: January 8, 2001
    Date of Patent: September 23, 2003
    Assignees: Highchem Company, Ltd., Charna Chemicals Ltd.
    Inventor: Xin Fang Ma