Abstract: A one-step process for the preparation of a substituted thioxanthone, such as carboxymethoxythioxanthone, in high yields and as a single isomer. The substituted aryl compound is reacted with mercaptobenzoic acid or dithiobisbenzoic acid in the presence of sulphuric acid.
Type:
Grant
Filed:
July 3, 2003
Date of Patent:
November 1, 2005
Assignee:
Great Lakes (UK) Limited
Inventors:
Allan William Timms, William Arthur Green
Abstract: A one-step process for the preparation of a substituted thioxanthone, such as carboxymethoxythioxanthone, in high yields and as a single isomer. The substituted aryl compound is reacted with mercaptobenzoic acid or dithiobisbenzoic acid in the presence of sulphuric acid.
Type:
Application
Filed:
July 3, 2003
Publication date:
March 25, 2004
Applicant:
Great Lakes (UK) Limited
Inventors:
Allan William Timms, William Arthur Green
Abstract: 1-chloropropylethyne is prepared by dehydrochlorination with a base of 1-chloro-1-cyclopropylethene, which is itself prepared by treating 1-cyclopropylethanone with dichlorotriarylphosphorane or dichlorotrialkylphosphorane in the presence of a base.
Type:
Grant
Filed:
April 5, 2001
Date of Patent:
March 4, 2003
Assignee:
Great Lakes (UK) Limited
Inventors:
Robert Gandy, Peter John Cremins, Allan Williams Timms
Abstract: Substituted sodium salts of phosphides are prepared by reacting a triarylphosphine with sodium in an aliphatic amine or diamine as a solvent or co-solvent. The resultant phosphides may be further treated with appropriate halides to produce unsymmetrical phosphines.
Type:
Grant
Filed:
January 11, 2000
Date of Patent:
April 10, 2001
Assignee:
Great Lakes (UK) Limited
Inventors:
Robert Gandy, Peter John Cremins, Allan William Timms
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