Patent ID: 6872849

Claim:
A sulfonyl halide of the general formula (I) wherein Arylene designates a carbocyclic or heterocyclic, aromatic ring system comprising 1-3 rings; R 1 , R 2 and R 3 are, independently, hydrogen, C 1-6 alkyl, C 1-6 alkoxy, halogen, nitro, cyano or phenyl; X is fluoro, chloro or bromo; and Y is a boroxine moiety attached via a bond from Arylene to one of the boron atoms of a boroxine ring which ring has a group of the formula -Arylene(R 1 )(R 2 )(R 3 )SO 2 X, wherein Arylene, R 1 , R 2 , R 3 and X are as defined above, at each of the other two boron atoms of the boroxine ring, or Y is a boronic acid group or a boronic ester group.