Patents by Inventor Antal S. May

Antal S. May 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 O-acylating phenol derivatives and acylating compositions for this purpose
    Patent number: 4323469
    Abstract: The invention relates to a process for the preparation of carbamic acid phenyl esters of the formula (I) ##STR1## by acylating phenol derivatives of the formula (II) ##STR2## wherein R is alkyl having 1 to 8 carbon atoms, aryl, cycloalkyl having 5 or 6 carbon atoms, aralkyl having 7 to 16 carbon atoms which groups can be substituted by one or more alkyl groups,R.sup.1 is hydrogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms or acylamino,R.sup.2 is hydrogen, halogen, alkyl having 1 to 4 carbon atoms or alkoxy having 1 to 4 carbon atoms, or ifR.sup.1 and R.sup.2 represent alkyl and/or alkoxy, they can form together a carbocyclic ring.According to the invention the phenol derivatives of the general formula (II), wherein R.sup.1 and R.sup.2 are as defined above, are reacted with N-carbamoyl-saccharin derivatives of the formula (IV) ##STR3## wherein R has the same meaning as defined above, in the presence of a base.
    Type: Grant
    Filed: October 28, 1980
    Date of Patent: April 6, 1982
    Assignee: Chinoin Gyogyszer es Vegyeszeti Termekek Gyara R.T.
    Inventors: Gyorgy Lugosi, Antal S. May, Janos Bodnar, Istvan Turcsan, Istvan Jelinek, Eva Somfai, Laszlo Simandi