Patents by Inventor Christof Sparr

Christof Sparr 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).

  • Publication number: 20240059650
    Abstract: The present invention relates to the photooxidation of 2,4,6-trimethyl-phenol to yield 4-hydroperoxy-2,4,6-trimethylcyclohexa-2,5-dien-1-one using methylene blue as photosensitizer in a solvent mixture of water and alcohols using light of the high wavelength range of the visible spectrum. This process allows 5 obtaining 4-hydroxy-2,4,6-trimethylcyclohexa-2,5-dien-1-one and 2,3,5-trimethyl-hydroquinone in high yields and selectivity from 2,4,6-trimethylphenol.
    Type: Application
    Filed: December 13, 2021
    Publication date: February 22, 2024
    Inventors: Werner BONRATH, Thomas BUCHHOLZ, Thomas NETSCHER, Jan SCHUETZ, Christof SPARR
  • Publication number: 20230001399
    Abstract: The present invention relates to specific transition metal catalysts and their use in chemical reactions.
    Type: Application
    Filed: November 2, 2020
    Publication date: January 5, 2023
    Inventors: Werner BONRATH, Frederic BOURGEOIS, Jonathan Alan MEDLOCK, Christof SPARR
  • Patent number: 11214687
    Abstract: The present invention relates to compounds of formula (A), wherein Z is NR10 or O. These compounds represent novel acridinium and xanthylium salts having an unprecedented substituted heterocyclic core. They are useful as fluorescent dyes or precursors thereof in different applications including various imaging and sensing techniques, and, in particular, as photosensitizers and hereby preferably as photocatalysts. The present invention further relates to processes for preparing the inventive compounds via 1,5-organodimetallic reagents from double directed ortho-metalation reactions or combined halogen-metal exchange/directed ortho-metalation reactions.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: January 4, 2022
    Assignee: UNIVERSITÄT BASEL
    Inventors: Christof Sparr, Christian Fischer
  • Publication number: 20200255667
    Abstract: The present invention relates to compounds of formula (A), wherein Z is NR10 or O. These compounds represent novel acridinium and xanthylium salts having an unprecedented substituted heterocyclic core. They are useful as fluorescent dyes or precursors thereof in different applications including various imaging and sensing techniques, and, in particular, as photosensitizers and hereby preferably as photocatalysts. The present invention further relates to processes for preparing the inventive compounds via 1,5-organodimetallic reagents from double directed ortho-metalation reactions or combined halogen-metal exchange/directed ortho-metalation reactions.
    Type: Application
    Filed: August 28, 2018
    Publication date: August 13, 2020
    Inventors: Christof Sparr, Christian Fischer