Branched compound, preparation method thereof and application of branched compound in preparation of branched alicyclic resin

The invention relates to a branched compound, a preparation method thereof and application of the branched compound in preparation of branched alicyclic resin. The compound (CTA-Br) with the branched structure has a structure as shown in a formula (I), and n in the formula (I) is an integer between 0 and 3; and X1, X2 and X3 are independently selected from Br or H, and at least one of X1, X2 and X3 is Br. The compound simultaneously contains a methacrylate structure and a functional group bromine with chain transfer reaction activity, the structure can keep lasting reaction activity and is copolymerized with a polymer matrix, and no small molecules are left in a reaction system in the chain transfer reaction process. And the branched alicyclic resin obtained by reacting with the alicyclic epoxy light-cured resin as a chain transfer agent has the advantages of favorable curing speed, favorable acid resistance and lower dielectric constant. 本发明涉及一种可支化的化合物及其制备方法和在制备支化脂环族树脂中的应用。本发明的支化结构的化合物(CTA-Br)，具有如式(I)所示结构：其中