Patents by Inventor Arumugham Balakumar

Arumugham Balakumar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Formyl- and acetal-porphyrins bearing tripodal linking groups
    Patent number: 8420804
    Abstract: A method of making a 5-formylporphyrin, comprises the steps of: condensing a 5-acetaldipyrromethane with a dipyrromethane-1,9-dicarbinol to produce a porphyrin having an acetal group substituted thereon at the 5 position; and then hydrolyzing said porphyrin to produce said 5-formylporphyrin. Products and intermediates useful in such methods, along with methods of making such intermediates, are also described.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: April 16, 2013
    Assignee: North Carolina State University
    Inventors: Arumugham Balakumar, Kannan Muthukumaran, Jonathan S. Lindsey
  • Methods and intermediates for the synthesis of porphyrins
    Patent number: 8013149
    Abstract: A method of making a porphyrin (I) is carried out by condensing (i) a bis(imino)dipyrromethane of Formula II: with (ii) a dipyrromethaneto produce a reaction product; then (b) optionally oxidizing said reaction product with an oxidizing agent; and then (c) optionally demetallating said reaction product to produce the porphyrin. Methods of making compounds of Formula II are also described.
    Type: Grant
    Filed: June 30, 2009
    Date of Patent: September 6, 2011
    Assignee: North Carolina State University
    Inventors: Jonathan S. Lindsey, Masahiko Taniguchi, Arumugham Balakumar, Dazhong Fan
  • NEW ROUTE TO FORMYL-PORPHYRINS
    Publication number: 20110152515
    Abstract: A method of making a 5-formylporphyrin, comprises the steps of: condensing a 5-acetaldipyrromethane with a dipyrromethane-1,9-dicarbinol to produce a porphyrin having an acetal group substituted thereon at the 5 position; and then hydrolyzing said porphyrin to produce said 5-formylporphyrin. Products and intetinediates useful in such methods, along with methods of making such intermediates, are also described.
    Type: Application
    Filed: February 25, 2011
    Publication date: June 23, 2011
    Inventors: Arumugham Balakumar, Kannan Muthukumaran, Jonathan S. Lindsey
  • Route to formyl-porphyrins
    Patent number: 7919615
    Abstract: A method of making a 5-formylporphyrin, comprises the steps of: condensing a 5-acetaldipyrromethane with a dipyrromethane-1,9-dicarbinol to produce a porphyrin having an acetal group substituted thereon at the 5 position; and then hydrolyzing said porphyrin to produce said 5-formylporphyrin. Products and intermediates useful in such methods, along with methods of making such intermediates, are also described.
    Type: Grant
    Filed: January 30, 2009
    Date of Patent: April 5, 2011
    Assignee: North Carolina State University
    Inventors: Arumugham Balakumar, Kannan Muthukumaran, Jonathan S. Lindsey
  • METHODS AND INTERMEDIATES FOR THE SYNTHESIS OF PORPHYRINS
    Publication number: 20090270638
    Abstract: A method of making a porphyrin (I) is carried out by condensing (i) a bis(imino)dipyrromethane of Formula II: with (ii) a dipyrromethaneto produce a reaction product; then (b) optionally oxidizing said reaction product with an oxidizing agent; and then (c) optionally demetallating said reaction product to produce the porphyrin. Methods of making compounds of Formula II are also described.
    Type: Application
    Filed: June 30, 2009
    Publication date: October 29, 2009
    Inventors: Jonathan S. Lindsey, Masahiko Taniguchi, Arumugham Balakumar, Dazhong Fan
  • Methods and intermediates for the synthesis of porphyrins
    Patent number: 7582751
    Abstract: A method of making a porphyrin (I) is carried out by condensing (i) a bis(imino)dipyrromethane of Formula II: with (ii) a dipyrromethane to produce a reaction product; then (b) optionally oxidizing said reaction product with an oxidizing agent; and then (c) optionally demetallating said reaction product to produce the porphyrin. Methods of making compounds of Formula II are also described.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: September 1, 2009
    Assignee: North Carolina State University
    Inventors: Jonathan S. Lindsey, Masahiko Taniguchi, Arumugham Balakumar, Dazhong Fan
  • NEW ROUTE TO FORMYL-PORPHYRINS
    Publication number: 20090137795
    Abstract: A method of making a 5-formylporphyrin, comprises the steps of: condensing a 5-acetaldipyrromethane with a dipyrromethane-1,9-dicarbinol to produce a porphyrin having an acetal group substituted thereon at the 5 position; and then hydrolyzing said porphyrin to produce said 5-formylporphyrin. Products and intermediates useful in such methods, along with methods of making such intermediates, are also described.
    Type: Application
    Filed: January 30, 2009
    Publication date: May 28, 2009
    Applicant: North Carolina State University
    Inventors: Arumugham Balakumar, Kannan Muthukumaran, Jonathan S. Lindsey
  • Route to formyl-porphyrins
    Patent number: 7501507
    Abstract: A method of making a 5-formylporphyrin, comprises the steps of: condensing a 5-acetaldipyrromethane with a dipyrromethane-1,9-dicarbinol to produce a porphyrin having an acetal group substituted thereon at the 5 position; and then hydrolyzing said porphyrin to produce said 5-formylporphyrin. Products and intermediates useful in such methods, along with methods of making such intermediates, are also described.
    Type: Grant
    Filed: June 14, 2004
    Date of Patent: March 10, 2009
    Assignee: North Carolina State University
    Inventors: Arumugham Balakumar, Kannan Muthukumaran, Jonathan S. Lindsey
  • Methods and intermediates for the synthesis of porphyrins
    Publication number: 20070027312
    Abstract: A method of making a porphyrin (I) is carried out by condensing (i) a bis(imino)dipyrromethane of Formula II: with (ii) a dipyrromethaneto produce a reaction product; then (b) optionally oxidizing said reaction product with an oxidizing agent; and then (c) optionally demetallating said reaction product to produce the porphyrin. Methods of making compounds of Formula II are also described.
    Type: Application
    Filed: July 29, 2005
    Publication date: February 1, 2007
    Inventors: Jonathan Lindsey, Masahiko Taniguchi, Arumugham Balakumar, Dazhong Fan
  • Route to formyl-porphyrins
    Publication number: 20050277770
    Abstract: A method of making a 5-formylporphyrin, comprises the steps of: condensing a 5-acetaldipyrromethane with a dipyrromethane-1,9-dicarbinol to produce a porphyrin having an acetal group substituted thereon at the 5 position; and then hydrolyzing said porphyrin to produce said 5-formylporphyrin. Products and intermediates useful in such methods, along with methods of making such intermediates, are also described.
    Type: Application
    Filed: June 14, 2004
    Publication date: December 15, 2005
    Inventors: Arumugham Balakumar, Kannan Muthukumaran, Jonathan Lindsey