The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 2006
Filed:
Aug. 15, 2003
Jonathan S. Lindsey, Raleigh, NC (US);
Savithri Dhanalekshmi, Raleigh, NC (US);
Joydev K. Laha, Raleigh, NC (US);
Masahiko Taniguchi, Raleigh, NC (US);
Jonathan S. Lindsey, Raleigh, NC (US);
Savithri Dhanalekshmi, Raleigh, NC (US);
Joydev K. Laha, Raleigh, NC (US);
Masahiko Taniguchi, Raleigh, NC (US);
North Carolina State University, Raleigh, NC (US);
Abstract
A (preferably nonaqueous) method of making a dipyrromethane is described. The comprises the steps of: (a) providing a reaction system consisting essentially of an aldehyde or acetal, excess pyrrole and a catalyst; (b) reacting the aldehyde or acetal with the pyrrole in the reaction system to form the dipyrromethane therein; (c) quenching the reaction system by adding a base thereto (preferably without simultaneously or concurrently adding water and/or an organic solvent thereto); (d) separating the catalyst from the reaction system; and then (e) separating the pyrrole from the reaction system to produce the dipyrromethane as a residual