Patents by Inventor Rajendra P. Singh

Rajendra P. Singh 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).

  • Perfluoroalkylation of carbonyl compounds
    Patent number: 9156758
    Abstract: The present invention provides a process for producing a compound comprising a perfluorinated alkyl group moiety from a carbonyl compound. Typically, the process includes contacting a carbonyl compound with a silane compound in the presence of a fluorohydrogenate ionic liquid under conditions sufficient to produce a compound comprising a perfluorinated alkyl group. The silane compound includes a perfluoroalkyl group.
    Type: Grant
    Filed: December 20, 2013
    Date of Patent: October 13, 2015
    Assignee: CoorsTek Fluorochemicals, Inc.
    Inventor: Rajendra P. Singh
  • PERFLUOROALKYLATION OF CARBONYL COMPOUNDS
    Publication number: 20150218068
    Abstract: The present invention provides a process for producing a compound comprising a perfluorinated alkyl group moiety from a carbonyl compound. Typically, the process includes contacting a carbonyl compound with a silane compound in the presence of a fluorohydrogenate ionic liquid under conditions sufficient to produce a compound comprising a perfluorinated alkyl group. The silane compound includes a perfluoroalkyl group.
    Type: Application
    Filed: December 20, 2013
    Publication date: August 6, 2015
    Applicant: BOULDER IONICS CORPORATION
    Inventor: Rajendra P. Singh
  • Fluoronation of alpha-haloalkyl ketones
    Patent number: 9090546
    Abstract: The present invention provides methods and processes for producing ?-fluoroalkyl ketones from non-fluoro ?-haloalkyl ketones using a fluorohydrogenate compound. In some embodiments, the fluorohydrogenate compound is an ionic liquid. One particular method of the invention utilizes a fluorohydrogenate ionic liquid compound of the formula: Q+[F.(HF)n], wherein Q+ is an onium cation and n is a number from 0 to 3.
    Type: Grant
    Filed: July 3, 2014
    Date of Patent: July 28, 2015
    Assignee: CoorsTek FluoroChemicals, Inc.
    Inventors: Rajendra P. Singh, Jerry Lynn Martin
  • SYNTHESIS OF FLUOROTRIFLUOROMETHYLSULFONYL IMIDE
    Publication number: 20150126778
    Abstract: The invention provides a method for producing fluorotrifluoromethylsulfonyl imide (FTFSI) by reacting non-fluorohalogenated trihalomethylsulfonyl imide (XTXSI) with hydrogen fluoride, where each X is independently a nonfluoro-halide, such as Cl, Br, or I.
    Type: Application
    Filed: November 4, 2013
    Publication date: May 7, 2015
    Applicant: Boulder Ionics Corporation
    Inventors: Joseph Carl Poshusta, Jerry Lynn Martin, Rajendra P. Singh
  • Process for Producing Ionic Liquids
    Publication number: 20140235873
    Abstract: The present invention provides a method for producing ionic liquids without the use of a volatile solvent and/or water. In some embodiments, methods of the invention allow a continuous process for producing ionic liquids.
    Type: Application
    Filed: February 19, 2013
    Publication date: August 21, 2014
    Applicant: BOULDER IONICS
    Inventors: Rajendra P. Singh, Jerry Lynn Martin, Joseph Carl Poshusta
  • Synthesis of hydrogen bis(fluorosulfonyl)imide
    Patent number: 8722005
    Abstract: The invention provides a method for producing hydrogen bis(fluorosulfonyl)imide (HFSI) by reacting hydrogen bis(halosulfonyl)imide (HXSI) with hydrogen fluoride, where each X is independently a nonfluoro-halide, such as Cl, Br, or I.
    Type: Grant
    Filed: July 26, 2013
    Date of Patent: May 13, 2014
    Assignee: Boulder Ionics Corporation
    Inventors: Joseph Carl Poshusta, Jerry Lynn Martin, Rajendra P. Singh
  • Synthesis of bis(fluorosulfonyl)imide
    Patent number: 8377406
    Abstract: The present invention provides methods for producing bis(fluorosulfonyl) compounds of the formula: F—S(O)2—Z—S(O)2—F??I by contacting a nonfluorohalide compound of the formula: X—S(O)2—Z—S(O)2—X with bismuth trifluoride under conditions sufficient to produce the bis(fluorosulfonyl) compound of Formula I, where Z and X are those defined herein.
    Type: Grant
    Filed: August 29, 2012
    Date of Patent: February 19, 2013
    Assignee: Boulder Ionics Corporation
    Inventors: Rajendra P. Singh, Jerry Lynn Martin, Joseph Carl Poshusta
  • Methods for Preparing Diaryl Disulfides
    Publication number: 20120157716
    Abstract: New and useful methods for preparing bulky diaryl disulfides from a benzene derivative and sulfur halide are disclosed.
    Type: Application
    Filed: June 17, 2011
    Publication date: June 21, 2012
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Teruo Umemoto, Rajendra P. Singh
  • 4-fluoropyrrolidine-2-carbonyl fluoride compounds and their preparative methods
    Patent number: 8203003
    Abstract: Novel 4-fluoropyrrolidine-2-carbonyl fluoride compounds as useful fluorinated intermediates are disclosed. Their preparative methods are also disclosed. Useful applications of the 4-fluoropyrrolidine-2-carbonyl fluorides are shown.
    Type: Grant
    Filed: January 8, 2010
    Date of Patent: June 19, 2012
    Assignee: UBE Industries, Ltd.
    Inventors: Teruo Umemoto, Rajendra P. Singh
  • Novel 4-Fluoropyrrolidine-2-Carbonyl Fluoride Compounds and Their Preparative Methods
    Publication number: 20110275833
    Abstract: Novel 4-fluoropyrrolidine-2-carbonyl fluoride compounds as useful fluorinated intermediates are disclosed. Their preparative methods are also disclosed. Useful applications of the 4-fluoropyrrolidine-2-carbonyl fluorides are shown.
    Type: Application
    Filed: January 8, 2010
    Publication date: November 10, 2011
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Teruo Umemoto, Rajendra P. Singh
  • Methods For Preparing Fluoroalkyl Arylsulfinyl Compounds And Fluorinated Compounds Thereto
    Publication number: 20110190511
    Abstract: Novel preparative methods for fluoroalkyl arylsulfinyl compounds are disclosed. Fluorinated compounds as useful fluorinated compounds, intermediates, or builing blocks are disclosed. Useful applications of the fluoroalkyl arylsulfinyl compounds are shown.
    Type: Application
    Filed: August 17, 2009
    Publication date: August 4, 2011
    Applicant: IM&T RESEARCH, INC.
    Inventors: Teruo Umemoto, Rajendra P. Singh
  • Fluorination Processes with Arylsulfur Halotetrafluorides
    Publication number: 20110160488
    Abstract: New fluorination processes for introducing one or more fluorine atoms into target substrate compounds with arylsulfur halotetrafluorides are disclosed. Also disclosed are methods for preparation of arylsulfur trifluorides.
    Type: Application
    Filed: March 6, 2009
    Publication date: June 30, 2011
    Applicant: I M &T RESEARCH, INC.
    Inventors: Teruo Umemoto, Rajendra P. Singh
  • METHODS AND COMPOSITIONS FOR PRODUCING DIFLUOROMETHYLENE-AND TRIFLUOROMETHYL-CONTAINING COMPOUNDS
    Publication number: 20100234605
    Abstract: New methods for producing difluoromethylene-containing compounds with phenylsulfur trifluoride or a primary alkyl-substituted phenylsulfur trifluoride are disclosed. Also, new methods for producing trifluoromethyl-containing compounds with phenylsulfur trifluoride or primary alkyl-substituted phenylsulfur trifluoride are also disclosed.
    Type: Application
    Filed: December 9, 2008
    Publication date: September 16, 2010
    Applicant: IM&T RESEARCH, INC.
    Inventors: Teruo Umemoto, Rajendra P. Singh
  • Methods for Production of Optically Active Fluoropyrrolidine Derivatives
    Publication number: 20100174096
    Abstract: Useful industrial methods for producing optically active fluoropyrrolidine derivatives as useful fluorinated intermediates are disclosed.
    Type: Application
    Filed: December 28, 2009
    Publication date: July 8, 2010
    Applicant: IM&T RESEARCH, INC.
    Inventors: Teruo Umemoto, Rajendra P. Singh
  • Methods for Preparing Fluoroalkyl Arylsulfinyl Compounds and Fluorinated Compounds Thereto
    Publication number: 20100152463
    Abstract: Novel preparative methods for fluoroalkyl arylsulfinyl compounds are disclosed. Fluorinated compounds as useful fluorinated compounds, intermediates, or building blocks are disclosed. Useful applications of the fluoroalkyl arylsulfinyl compounds are shown.
    Type: Application
    Filed: December 8, 2009
    Publication date: June 17, 2010
    Applicant: IM&T RESEARCH, INC.
    Inventors: Teruo Umemoto, Rajendra P. Singh
  • SUBSTITUTED PHENYLSULFUR TRIFLUORIDE AND OTHER LIKE FLUORINATING AGENTS
    Publication number: 20080221364
    Abstract: Novel substituted phenylsulfur trifluorides that act as fluorinating agents are disclosed. Also disclosed are methods for their preparation and methods for their use in introducing one or more fluorine atoms into target substrate compounds. Finally, various intermediate compounds for use in preparing substituted phenylsulfur trifluorides are provided.
    Type: Application
    Filed: April 21, 2008
    Publication date: September 11, 2008
    Applicant: IM&T RESEARCH, INC.
    Inventors: TERUO UMEMOTO, RAJENDRA P. SINGH
  • Substituted phenylsulfur trifluoride and other like fluorinating agents
    Patent number: 7381846
    Abstract: Novel substituted phenylsulfur trifluorides that act as fluorinating agents are disclosed. Also disclosed are methods for their preparation and methods for their use in introducing one or more fluorine atoms into target substrate compounds. Finally, various intermediate compounds for use in preparing substituted phenylsulfur trifluorides are provided.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: June 3, 2008
    Assignee: IM&T Research, Inc.
    Inventors: Teruo Umemoto, Rajendra P. Singh
  • SUBSTITUTED PHENYLSULFUR TRIFLUORIDE AND OTHER LIKE FLUORINATING AGENTS
    Publication number: 20080039660
    Abstract: Novel substituted phenylsulfur trifluorides that act as fluorinating agents are disclosed. Also disclosed are methods for their preparation and methods for their use in introducing one or more fluorine atoms into target substrate compounds. Finally, various intermediate compounds for use in preparing substituted phenylsulfur trifluorides are provided.
    Type: Application
    Filed: July 25, 2007
    Publication date: February 14, 2008
    Applicant: IM&T RESEARCH, INC.
    Inventors: TERUO UMEMOTO, RAJENDRA P. SINGH
  • Stereocontrolled synthesis of serricornin
    Patent number: 5817882
    Abstract: Serricornin, the attractant pheromone of the cigarette beetle, is synthesized in high enantiomeric and diastereomeric purity via a series of reactions of asymmetric 2-(1-haloalkyl)-1,3,2-dioxaborolanes with Grignard reagents, which lead to the key intermediate ?,S-(R*,R*,R*)!-2-ethyl-3,5-dimethyl-l-octen-6-ol. Oxidative cleavage of the carbon-carbon double bond of ?S-(R*,R*,R*)!-2-ethyl-3,5-dimethyl-l-octen -6-ol with osmium tetroxide and sodium periodate yields serricornin.
    Type: Grant
    Filed: September 4, 1997
    Date of Patent: October 6, 1998
    Assignee: Washington State University Research Foundation
    Inventors: Donald S. Matteson, Rajendra P. Singh