Patent ID: 6995110

Claim:
A complex catalyst comprising, as components, a Lewis acid and a metal complex of formula (1): wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are the same or different and are independently hydrogen, halogen, alkyl, alkenyl, alkynyl, alkoxy, haloalkyl, haloalkoxy, hydroxyl, nitro, amino, carbamoyl, carboxyl, substituted or unsubstituted aryl, or silyl; or two adjacent groups of R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are combined together to represent a naphthalene ring by forming a ring together with a benzene ring to which they are attached; one of R 9 and R 10 is hydrogen and the other is phenyl or naphthyl optionally substituted with at least one selected from the group consisting of alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms, haloalkyl, haloalkoxy and halogen; or either one pair of R 9 and R 10 attached to the different carbon atoms are combined together at their ends to form a tetramethylene linkage and the other pair are hydrogen atoms; Q is a single bond or alkylene of 1 to 4 carbon atoms; or Q is combined with R 9 and R 10 to represent 1,1′-binaphthyl attached to the nitrogen atoms at 2 and 2′ positions; M is cobalt ion, a chromium ion or a manganese ion; and A is a balancing counter ion or ligand, wherein the Lewis acid is selected from the group consisting of an aluminum halide, a dialkyl aluminum halide, a trialkoxy aluminum, a titanium halide, a tetraalkoxy titanium, a boron halide and a zinc halide.