Compounds of formula I or II
##STR1##
where R is an aryl moiety, such as phenyl, naphthyl or biphenylyl, or is
phenyl substituted by one or more trifluoromethyl, bromo or cyano, and
E.sub.1 and E.sub.2 are independently hydrogen, alkyl, aralkyl and the
like are prepared by reaction of a benzotriazole substituted on the
5-position of the benzo ring by a halogen atom with a arylboronic acid or
ester in the presence of a transition-metal catalyst, such as
palladium(II) diacetate. The benzotriazole compounds of formula I are
particularly efficacious as stabilizers for automotive coatings and candle
wax.
