Patents by Inventor Mark S. Baird

Mark S. Baird 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).

  • Process for opening cyclopropane rings
    Patent number: 5126461
    Abstract: Process for ring opening compounds of the formula ##STR1## in which R.sup.1 is heteroaryl or aryl, R.sup.2 is a leaving group, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are independently selected from hydrogen, alkyl, aralkyl, aryl, heteroaryl and alkenyl, provided that at least one of the groups R.sup.3 to R.sup.6 is other than hydrogen, by breaking the bond joining the carbon atom attached to R.sup.3 and the carbon atom attached to R.sup.6 in organic solution using silica, giving useful diene or allyl derivatives, certain of which are novel.
    Type: Grant
    Filed: November 14, 1990
    Date of Patent: June 30, 1992
    Assignee: Shell Research Limited
    Inventors: Mark S. Baird, Ian Bruce
  • Diazirine derivatives of aromatic heterocyclic compounds
    Patent number: 5120861
    Abstract: Compounds of the formula ##STR1## in which Het represents an optionally substituted aromatic heterocycle having a sulphur or oxygen hetero atom and attached via a ring carbon atom, and X is halogen, alkyl, alkaryl, cyano, alkoxy, mono- or di-alkylamino, acyloxy or aryl, are useful intermediates to a range of cyclopropane derivatives. Processes for their preparation and their use in further synthetic processes are also described.
    Type: Grant
    Filed: November 16, 1990
    Date of Patent: June 9, 1992
    Assignee: Shell Research Limited
    Inventors: Mark S. Baird, Ian Bruce