Patents by Inventor Istvan Schler

Istvan Schler 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 the preparation of trichloromethyl carbinols
    Patent number: 4999454
    Abstract: The invention is directed to a new process for the preparation of carbinols of the general formula I ##STR1## by reaction chloral and olefins of the general formula ##STR2## and by optional acylation of the product comprising dissolving a catalyst of the general formula IIIFe.sub.n (NH.sub.4).sub.x Y.sub.m .multidot.A.sub.p IIIin chloral, then adding the olefin of the general formula II in order to produce a complex of the general formula IV ##STR3## from which a complex of the general formula V ##STR4## is formed, and from the reaction mixture a compound of the general formula I is obtained whereafter(a) the residual complex of the general formula V dissolved in the product is decomposed with an acidic solution and if desired the obtained product is distilled or(b) the product in the reaction mixture is acylated.The compounds prepared according to the invention can be utilized as intermediates when preparing e.g., permethrin and other pyrethroid insecticides.
    Type: Grant
    Filed: October 3, 1985
    Date of Patent: March 12, 1991
    Assignee: Chinoin Gyogyszer ES Vegyeszeti Termekek Gyara RT.
    Inventors: Rudolf Soos, Jozsef Nemes, Miklos Szelestei, Istvan Schler, Laszlo Vidra, Istvan Szekely