US 4,788,268 A · Method for preparation of epoxysilicone compounds and allyl-terminated silicone compounds

Abstract

Epoxysilicone compounds are prepared by first reacting a dibromobenzene compound with magnesium in anhydrous ether solvent to form a Grignard reagent and subsequently reacting the Grignard reagent with allyl bromide to form a (bromophenyl)propene compound. Next, the (bromophenyl)propene compound is converted to the corresponding Grignard reagent, which is then reacted with a compound of the formula I below ##STR1## where n=1 to 6, R.sub.1 and R.sub.2 are each chosen from the group consisting of a C.sub.1 to C.sub.4 alkyl group, a substituted aryl group, and an unsubstituted aryl group. in tetrahydrofuran solvent to form an allyl-terminated silicone compound of formula II below ##STR2## Finally, the allyl-terminated silicone compound is reacted with a chosen epoxidizing agent to form the epoxysilicone compound of formula III below. ##STR3##

Claims13

Dependent claims

A method for preparing epoxysilicone compounds comprising the steps of:

(a) reacting a dibromobenzene compound with magnesium in anhydrous ether solvent to form a first Grignard reagent and subsequently reacting said first Grignard reagent with allyl bromide to form a 3-(bromophenyl) propene compound;
(b) reacting said 3-(bromophenyl)propene compound with magnesium in anhydrous tetrahydrofuran to form a second Grignard reagent and subsequently reacting said second Grignard reagent with a compound of the formula I below:
##STR17## where n=1 to 6,
R.sub.1 and R.sub.2 are each chosen from the group consisting of a C.sub.1 to C.sub.4 alkyl group, a substituted aryl group, and an unsubstituted aryl group,
in tetrahydrofuran solvent to form an intermediate compound of formula II below:
##STR18## (c) reacting said compound of formula II with an epoxidizing agent selected from the group consisting of:
trichloroacetonitrile and hydrogen peroxide in a biphasic medium;
and 3-chloroperoxybenzoic acid, to form said epoxysilicone compound of formula III below:
##STR19##

6 more elements

Dependencies are inferred from the claim text.

Method for preparation of epoxysilicone compounds and allyl-terminated silicone compounds

Life of this patent

Method for preparation of epoxysilicone compounds and allyl-terminated silicone compounds

Life of this patent

Abstract

Claims13