Patents by Inventor Ulla Letinois

Ulla Letinois 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).

  • FORMATION OF P-ALKYLPHENOLS BASED ON INTERMOLECULAR REACTION OF ETHYNE WITH 2-ALKYLFURANS IN THE PRESENCE OF GOLD(I) COMPLEXES
    Publication number: 20230416178
    Abstract: The present invention relates to the synthesis of p-alkylphenols and of 2,6-dimethyl-4-alkyl phenol from 2-alkylfurans with acetylene in the presence of a gold(I) complex as well as to 2,3,6 trimethylhydroquinone.
    Type: Application
    Filed: November 8, 2021
    Publication date: December 28, 2023
    Inventors: Stephan ACKERMANN-MAURER, Werner BONRATH, Ulla LETINOIS, Thomas NETSCHER, Jan SCHUETZ
  • Synthesis of intermediates for the preparation of alpha-tocopherol
    Patent number: 11724996
    Abstract: The present invention relates to a novel synthetic pathway for alpha-tocopherol. The invention discloses different reactions yielding some new intermediates in a very high yield and stereoselectivity.
    Type: Grant
    Filed: May 3, 2021
    Date of Patent: August 15, 2023
    Assignee: DSM IP ASSETS B.V.
    Inventors: Ulla Letinois, Thomas Netscher, August Ruettimann
  • SYNTHESIS OF INTERMEDIATES FOR THE PREPARATION OF ALPHA-TOCOPHEROL
    Publication number: 20210300886
    Abstract: The present invention relates to a novel synthetic pathway for alpha-tocopherol. The invention discloses different reactions yielding some new intermediates in a very high yield and stereoselectivity.
    Type: Application
    Filed: May 3, 2021
    Publication date: September 30, 2021
    Inventors: Ulla LETINOIS, Thomas NETSCHER, August RUETTIMANN
  • NOVEL DICARBOXYLIC ACID DIESTERS
    Publication number: 20210163397
    Abstract: The present invention relates to novel dicarboxylic diesters as well as the use thereof as for inhibiting the methane production in ruminants
    Type: Application
    Filed: April 23, 2019
    Publication date: June 3, 2021
    Inventors: Stefan Karl LAEUGER, Ulla LETINOIS, Peter RIEBEL
  • Intermolecular reaction of propargyl ethers with dimethylfuran in the presence of gold(I) complexes
    Patent number: 10815178
    Abstract: The present invention relates to a method of preparing ortho substituted phenols from 2,5-dimethylfuran and propargyl ethers in the presence of a gold(I) complex. It is particularly advantageous to use 2,5-dimethylfuran as this offers an ecological beneficial synthesis of said ortho substituted phenols.
    Type: Grant
    Filed: December 19, 2019
    Date of Patent: October 27, 2020
    Assignee: DSM IP ASSETS B.V.
    Inventors: Ulla Letinois, Stephan Ackermann, Jonathan Alan Medlock, Hajo Lehmann
  • NOVEL SYNTHESIS OF INTERMEDIATES FOR THE PREPARATION OF ALPHA-TOCOPHEROL
    Publication number: 20200131145
    Abstract: The present invention relates to a novel synthetic pathway for alpha-tocopherol. The invention discloses different reactions yielding some new intermediates in a very high yield and stereoselectivity.
    Type: Application
    Filed: July 11, 2018
    Publication date: April 30, 2020
    Inventors: Ulla LETINOIS, Thomas NETSCHER, August RUETTIMANN
  • INTERMOLECULAR REACTION OF PROPARGYL ETHERS WITH DIMETHYLFURAN IN THE PRESENCE OF GOLD(I) COMPLEXES
    Publication number: 20200123087
    Abstract: The present invention relates to a method of preparing ortho substituted phenols from 2,5-dimethylfuran and propargyl ethers in the presence of a gold(I) complex. It is particularly advantageous to use 2,5-dimethylfuran as this offers an ecological beneficial synthesis of said ortho substituted phenols.
    Type: Application
    Filed: December 19, 2019
    Publication date: April 23, 2020
    Inventors: Ulla LETINOIS, Stephan ACKERMANN, Jonathan Alan MEDLOCK, Hajo LEHMANN
  • INTERMOLECULAR REACTION OF PROPARGYL ETHERS WITH DIMETHYLFURAN IN THE PRESENCE OF GOLD(I) COMPLEXES
    Publication number: 20180370887
    Abstract: The present invention relates to a method of preparing ortho substituted phenols from 2,5-dimethylfuran and propargyl ethers in the presence of a gold(I) complex. It is particularly advantageous to use 2,5-dimethylfuran as this offers an ecological beneficial synthesis of said ortho substituted phenols.
    Type: Application
    Filed: November 28, 2016
    Publication date: December 27, 2018
    Applicant: DSM IP Assets B.V.
    Inventors: Ulla LETINOIS, Stephan ACKERMANN, Jonathan Alan MEDLOCK, Hajo LEHMANN
  • Formation of chromanes based on intermolecular reaction of alkynes with dimethylfuran in the presence of gold(I) complexes
    Patent number: 10047065
    Abstract: The present invention relates to a method of preparing chromanes from 2,5-dimethylfuran and substituted alkynes comprising an long chain unsaturated alkyl group as substituent in the alpha position of a substituted phenol followed by oxidation, reduction and acid ring closure. It is particularly advantageous to use 2,5-dimethylfuran as this offers an ecological beneficial synthesis of ?-tocopherol.
    Type: Grant
    Filed: December 9, 2015
    Date of Patent: August 14, 2018
    Assignee: DSM IP ASSETS B.V.
    Inventors: Ulla Letinois, Thomas Netscher
  • Process of production of 1-(5,5-dimethylcyclohex-1-en-1-yl)ethanone and 1-(5,5-dimethylcyclohex-6-en-1-yl )ethanone
    Patent number: 10005710
    Abstract: The present invention relates to an improved method for producing of 1-(5,5-dimethylcyclohex-1-en-1-yl)ethanone and 1-(5,5-dimethylcyclohex-6-en-1-yl)ethanone.
    Type: Grant
    Filed: March 26, 2015
    Date of Patent: June 26, 2018
    Assignee: DSM IP ASSETS B.V.
    Inventors: Werner Bonrath, Raphael Beumer, Ulla Letinois
  • Formation of chiral 4-chromanones using chiral pyrrolidines in the presence of acids
    Patent number: 9981935
    Abstract: The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of a specific type and of at least one Bransted acid or in the presence a specific chiral compound having a Bransted acid functional group in the molecule.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: May 29, 2018
    Assignee: DSM IP ASSETS B.V.
    Inventors: Jonathan Alan Medlock, Ulla Letinois, Thomas Netscher, Werner Bonrath
  • Process of production of 2,5-dimethylphenol
    Patent number: 9902674
    Abstract: The present invention relates to a new method to produce 2,5-dimethylphenol (2,5-DMP).
    Type: Grant
    Filed: January 27, 2015
    Date of Patent: February 27, 2018
    Assignee: DSM IP ASSETS B.V.
    Inventors: Werner Bonrath, Ulla Letinois, Thomas Netscher
  • FORMATION OF CHROMANES BASED ON INTERMOLECULAR REACTION OF ALKYNES WITH DIMETHYLFURAN IN THE PRESENCE OF GOLD(I) COMPLEXES
    Publication number: 20170349563
    Abstract: The present invention relates to a method of preparing chromanes from 2,5-dimethylfuran and substituted alkynes comprising an long chain unsaturated alkyl group as substituent in the alpha position of a substituted phenol followed by oxidation, reduction and acid ring closure. It is particularly advantageous to use 2,5-dimethylfuran as this offers an ecological beneficial synthesis of ?-tocopherol.
    Type: Application
    Filed: December 9, 2015
    Publication date: December 7, 2017
    Inventors: Ulla LETINOIS, Thomas NETSCHER
  • Formation of chiral 4-chromanones using chiral pyrrolidines in the presence of phenols or thiophenols
    Patent number: 9815809
    Abstract: The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of formula of a specific type and of at least one phenol or thiophenol.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: November 14, 2017
    Assignee: DSM IP ASSETS B.V.
    Inventors: Ulla Letinois, Thomas Netscher
  • Formation of chiral 4-chromanones using chiral pyrrolidines in the presence of ureas or thioureas
    Patent number: 9809565
    Abstract: The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of formula of a specific type and of at least one urea or thiourea.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: November 7, 2017
    Assignee: DSM IP ASSETS B.V.
    Inventors: Ulla Letinois, Thomas Netscher, Stephan Ackermann
  • PROCESS OF PRODUCTION OF 1-(5,5-DIMETHYLCYCLOHEX-1-EN-1-YL)ETHANONE AND 1-(5,5-DIMETHYLCYCLOHEX-6-EN-1-YL )ETHANONE
    Publication number: 20170217864
    Abstract: The present invention relates to an improved method for producing of 1-(5,5-dimethylcyclohex-1-en-1-yl)ethanone and 1-(5,5-dimethylcyclohex-6-en-1-yl)ethanone.
    Type: Application
    Filed: March 26, 2015
    Publication date: August 3, 2017
    Inventors: Werner BONRATH, Raphael BEUMER, Ulla LETINOIS
  • PROCESS OF PRODUCTION OF 2,5-DIMETHYLPHENOL
    Publication number: 20170001935
    Abstract: The present invention relates to a new method to produce 2,5-dimethylphenol (2,5-DMP).
    Type: Application
    Filed: January 27, 2015
    Publication date: January 5, 2017
    Inventors: Werner BONRATH, Ulla LETINOIS, Thomas NETSCHER
  • FORMATION OF CHIRAL 4-CHROMANONES USING CHIRAL PYRROLIDINES IN THE PRESENCE OF ACIDS
    Publication number: 20160168110
    Abstract: The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of a specific type and of at least one Bransted acid or in the presence a specific chiral compound having a Bransted acid functional group in the molecule.
    Type: Application
    Filed: July 3, 2014
    Publication date: June 16, 2016
    Inventors: Jonthan Alan MEDLOCK, Ulla LETINOIS, Thomas NETSCHER, Wemer BONRATH
  • FORMATION OF CHIRAL 4-CHROMANONES USING CHIRAL PYRROLIDINES IN THE PRESENCE OF PHENOLS OR THIOPHENOLS
    Publication number: 20160168111
    Abstract: The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of formula of a specific type and of at least one phenol or thiophenol.
    Type: Application
    Filed: July 3, 2014
    Publication date: June 16, 2016
    Inventors: Ulla LETINOIS, Thomas NETSCHER
  • FORMATION OF CHIRAL 4-CHROMANONES USING CHIRAL PYRROLIDINES
    Publication number: 20160152588
    Abstract: The present invention relates to a synthesis of chromanones or chromanes in a stereospecific matter in view of the 2-position in the chromanone or chromane ring. It has been found that this synthesis is particularly possible in the presence of a chiral compound of formula of a specific.
    Type: Application
    Filed: July 3, 2014
    Publication date: June 2, 2016
    Applicant: DSM IP ASSETS B.V.
    Inventors: Stephan ACKERMANN, Ulla LETINOIS