Patents by Inventor Kannan Muthukumaran

Kannan Muthukumaran 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).

  • Patent number: 7423160
    Abstract: A method of making a metal complex comprises combining a 1-monoacyldipyrromethane with a compound of the formula R1R2MX, wherein M is boron, R1 and R2 are each independently organic substituents; and X is an anion leaving group; to produce a metal complex of the formula DMR1R2 wherein DH is a 1-monoacyldipyrromethane. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins.
    Type: Grant
    Filed: August 29, 2007
    Date of Patent: September 9, 2008
    Assignee: North Carolina State University
    Inventors: Jonathan S. Lindsey, Kannan Muthukumaran, Marcin Ptaszek, H. Z. Syeda Huma
  • Publication number: 20080071093
    Abstract: A method of making a metal complex comprises combining a 1-monoacyldipyrromethane with a compound of the formula R1R2MX, wherein M is boron, R1 and R2 are each independently organic substituents; and X is an anion leaving group; to produce a metal complex of the formula DMR1R2 wherein DH is a 1-monoacyldipyrromethane. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins.
    Type: Application
    Filed: August 29, 2007
    Publication date: March 20, 2008
    Inventors: Jonathan Lindsey, Kannan Muthukumaran, Marcin Ptaszek, H. Z. Huma
  • Patent number: 7332599
    Abstract: The present invention provides dipyrrin substituted porphyrinic macrocycles, intermediates useful for making the same, and methods of making the same. Such compounds may be used for purposes including the making of molecular memory devices, solar cells and light harvesting arrays.
    Type: Grant
    Filed: June 6, 2003
    Date of Patent: February 19, 2008
    Assignee: North Carolina State University
    Inventors: Lianhe Yu, Kannan Muthukumaran, Prathapan Sreedharan, Jonathan S. Lindsey
  • Publication number: 20080027232
    Abstract: A method of making a metal complex comprises combining a 1-monoacyldipyrromethane with a compound of the formula R1R2MX, wherein M is boron, R1 and R2 are each independently organic substituents; and X is an anion leaving group; to produce a metal complex of the formula DMR1R2 wherein DH is a 1-monoacyldipyrromethane. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins.
    Type: Application
    Filed: August 29, 2007
    Publication date: January 31, 2008
    Inventors: Jonathan Lindsey, Kannan Muthukumaran, Marcin Ptaszek, H.Z. Huma
  • Patent number: 7323561
    Abstract: A first aspect of the invention is a method of making a porphyrin-metal complex, comprising: (a) providing a first reagent selected from the group consisting of 1-acyldipyrromethanes, 1-acyldipyrrins, dipyrromethane-1-carbinols 1,9-diacyldipyrromethanes and 1,9-diacyldipyrrins; and then (b) condensing the first reagent with either itself (in the case of 1-acyldipyrromethanes, 1-acyldipyrrins, and dipyrromethane-1-carbinols) or a dipyrromethane (in the case of 1,9-diacyldipyrromethanes and 1,9-diacyldipyrrins) in a reaction mixture comprising a solvent and a second reagent selected from the group consisting of palladium and copper complexes to produce the porphyrin-metal complex (with the metal being palladium or copper). In preferred embodiments of the foregoing, the reaction mixture further comprises a base such as KOH or NaH.
    Type: Grant
    Filed: December 23, 2004
    Date of Patent: January 29, 2008
    Assignee: North Carolina State University
    Inventors: Jonathan S. Lindsey, Kannan Muthukumaran, Duddu S. Sharada, Ana Z. Muresan, W. Justin Youngblood
  • Patent number: 7317108
    Abstract: A method of making a metal complex comprises combining a 1-monoacyldipyrromethane with a compound of the formula R1R2MX, wherein M is boron, R1 and R2 are each independently organic substituents; and X is an anion leaving group; to produce a metal complex of the formula DMR1R2 wherein DH is a 1-monoacyldipyrromethane. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: January 8, 2008
    Assignee: North Carolina State University
    Inventors: Jonathan S. Lindsey, Kannan Muthukumaran, Marcin Ptaszek, H. Z. Syeda Huma
  • Patent number: 7314941
    Abstract: A method of making a phosphono-substituted dipyrromethane comprises reacting an aldehyde or acetal having at least one phosphono group substituted thereon with pyrrole to produce a phosphono-substituted dipyrromethane; and wherein the phosphono is selected from the group consisting of dialkyl phosphono, diaryl phosphono, and dialkylaryl phosphono. Additional methods, intermediates and products are also described.
    Type: Grant
    Filed: October 27, 2006
    Date of Patent: January 1, 2008
    Assignees: North Carolina State University, ZettaCore, Inc.
    Inventors: Jonathan S. Lindsey, Robert S. Loewe, Kannan Muthukumaran, Arounaguiry Ambroise
  • Patent number: 7282582
    Abstract: A method of making a metal complex comprises combining a 1-monoacyldipyrromethane with a compound of the formula R1R2MX, wherein M is boron, R1 and R2 are each independently organic substituents; and X is an anion leaving group; to produce a metal complex of the formula DMR1R2 wherein DH is a 1-monoacyldipyrromethane. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins.
    Type: Grant
    Filed: November 13, 2006
    Date of Patent: October 16, 2007
    Assignee: North Carolina State University
    Inventors: Jonathan S. Lindsey, Kannan Muthukumaran, Marcin Ptaszek, H. Z. Syeda Huma
  • Publication number: 20070191600
    Abstract: The present invention provides dipyrrin substituted porphyrinic macrocycles, intermediates useful for making the same, and methods of making the same. Such compounds may be used for purposes including the making of molecular memory devices, solar cells and light harvesting arrays.
    Type: Application
    Filed: April 20, 2007
    Publication date: August 16, 2007
    Applicant: North Carolina State University
    Inventors: Lianhe Yu, Kannan Muthukumaran, Prathapan Sreedharan, Jonathan Lindsey
  • Publication number: 20070088158
    Abstract: A method of making a metal complex comprises combining a 1-monoacyldipyrromethane with a compound of the formula R1R2MX, wherein M is boron, R1 and R2 are each independently organic substituents; and X is an anion leaving group; to produce a metal complex of the formula DMR1R2 wherein DH is a 1-monoacyldipyrromethane. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins.
    Type: Application
    Filed: November 13, 2006
    Publication date: April 19, 2007
    Inventors: Jonathan Lindsey, Kannan Muthukumaran, Marcin Ptaszek, H.Z. Huma
  • Publication number: 20070055060
    Abstract: A method of making a phosphono-substituted dipyrromethane comprises reacting an aldehyde or acetal having at least one phosphono group substituted thereon with pyrrole to produce a phosphono-substituted dipyrromethane; and wherein the phosphono is selected from the group consisting of dialkyl phosphono, diaryl phosphono, and dialkylaryl phosphono. Additional methods, intermediates and products are also described.
    Type: Application
    Filed: October 27, 2006
    Publication date: March 8, 2007
    Inventors: Jonathan Lindsey, Robert Loewe, Kannan Muthukumaran, Arounaguiry Ambroise
  • Patent number: 7153975
    Abstract: A method of making a metal complex comprises combining a 1-monoacyldipyrromethane with a compound of the formula R1R2MX, wherein M is boron, R1 and R2 are each independently organic substituents; and X is an anion leaving group; to produce a metal complex of the formula DMR1R2 wherein DH is a 1-monoacyldipyrromethane. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins.
    Type: Grant
    Filed: June 18, 2004
    Date of Patent: December 26, 2006
    Assignee: North Carolina State University
    Inventors: Jonathan S. Lindsey, Kannan Muthukumaran, Marcin Ptaszek, H. Z. Syeda Huma
  • Patent number: 7148361
    Abstract: A method of making a phosphono-substituted dipyrromethane comprises reacting an aldehyde or acetal having at least one phosphono group substituted thereon with pyrrole to produce a phosphono-substituted dipyrromethane; and wherein the phosphono is selected from the group consisting of dialkyl phosphono, diaryl phosphono, and dialkylaryl phosphono. Additional methods, intermediates and products are also described.
    Type: Grant
    Filed: October 31, 2003
    Date of Patent: December 12, 2006
    Assignees: North Carolina State University, ZettaCore, Inc.
    Inventors: Jonathan S. Lindsey, Robert S. Loewe, Kannan Muthukumaran, Arounaguiry Ambroise
  • Publication number: 20060142562
    Abstract: A first aspect of the invention is a method of making a porphyrin-metal complex, comprising: (a) providing a first reagent selected from the group consisting of 1-acyldipyrromethanes, 1-acyldipyrrins, dipyrromethane-1-carbinols 1,9-diacyldipyrromethanes and 1,9-diacyldipyrrins; and then (b) condensing the first reagent with either itself (in the case of 1-acyldipyrromethanes, 1-acyldipyrrins, and dipyrromethane-1-carbinols) or a dipyrromethane (in the case of 1,9-diacyldipyrromethanes and 1,9-diacyldipyrrins) in a reaction mixture comprising a solvent and a second reagent selected from the group consisting of palladium and copper complexes to produce the porphyrin-metal complex (with the metal being palladium or copper). In preferred embodiments of the foregoing, the reaction mixture further comprises a base such as KOH or NaH.
    Type: Application
    Filed: December 23, 2004
    Publication date: June 29, 2006
    Inventors: Jonathan Lindsey, Kannan Muthukumaran, Sharada Duddu, Ana Muresan, W. Youngblood
  • Publication number: 20050282778
    Abstract: A method of making a metal complex comprises combining a 1-monoacyldipyrromethane with a compound of the formula R1R2MX, wherein M is boron, R1 and R2 are each independently organic substituents; and X is an anion leaving group; to produce a metal complex of the formula DMR1R2 wherein DH is a 1-monoacyldipyrromethane. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins.
    Type: Application
    Filed: June 18, 2004
    Publication date: December 22, 2005
    Inventors: Jonathan Lindsey, Kannan Muthukumaran, Marcin Ptaszek, H.Z. Huma
  • Publication number: 20050282779
    Abstract: A method of making a metal complex comprises combining a 1-monoacyldipyrromethane with a compound of the formula R1R2MX, wherein M is boron, R1 and R2 are each independently organic substituents; and X is an anion leaving group; to produce a metal complex of the formula DMR1R2 wherein DH is a 1-monoacyldipyrromethane. The methods and complexes are useful for the purification and synthesis of dipyrromethanes and porphyrins.
    Type: Application
    Filed: October 1, 2004
    Publication date: December 22, 2005
    Inventors: Jonathan Lindsey, Kannan Muthukumaran, Marcin Ptaszek, H.Z. Huma
  • 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
  • Publication number: 20050096465
    Abstract: A method of making a phosphono-substituted dipyrromethane comprises reacting an aldehyde or acetal having at least one phosphono group substituted thereon with pyrrole to produce a phosphono-substituted dipyrromethane; and wherein the phosphono is selected from the group consisting of dialkyl phosphono, diaryl phosphono, and dialkylaryl phosphono. Additional methods, intermediates and products are also described.
    Type: Application
    Filed: October 31, 2003
    Publication date: May 5, 2005
    Inventors: Jonathan Lindsey, Robert Loewe, Kannan Muthukumaran, Arounaguiry Ambroise
  • Publication number: 20040254383
    Abstract: The present invention provides dipyrrin substituted porphyrinic macrocycles, intermediates useful for making the same, and methods of making the same. Such compounds may be used for purposes including the making of molecular memory devices, solar cells and light harvesting arrays.
    Type: Application
    Filed: June 6, 2003
    Publication date: December 16, 2004
    Inventors: Lianhe Yu, Kannan Muthukumaran, Prathapan Sreedharan, Jonathan S. Lindsey