Patent ID: 6489526
Filing Date: 2002-12-03
Classification: C07C,C07F

Abstract:
A method for synthesizing hydrocarbyl bridged indene which comprises:(i) reacting indene with an alkali metal alkyl in a non-interfering solvent at a temperature below 0Â° C., wherein a first reaction mixture containing an alkali metal indenide and said solvent is produced; (ii) raising the temperature of said first reaction mixture to from 20Â° C. to 40Â° C.; (iii) combining said step (ii) first reaction mixture at 20Â° C. to 40Â° C. with a terminal dihalo alkane, wherein a second reaction mixture is produced and thereafter; (iv) adding tetrahydrofuran to said second reaction mixture wherein a third reaction mixture containing said hydrocarbyl bridged indene is produced; (v) adding water to said third reaction mixture, wherein an organic phase and an aqueous phase form; (vi) separating said step (v) aqueous and organic phases; and (vii) exchanging the solvent of said organic phase separated in step (v) with a hydrocarbon solvent from which said hydrocarbyl bridged indene is separated.