Benzoxazine-containing formulations polymerizable/curable at low temperature

A polymerization catalyst according to formula I

• wherein n=1, 2, 3 or 4,
• E1 as well as E2 are electron withdrawing substituents,
• R is a hydrogen, linear or branched substituted or non substituted alkyl group with 1 to 20 C-atoms, an aryl-group, hydroxyl-group, an ether bridged alkyl chain or halogen,
• and Metal is selected from the group of all metals which are capable of forming metal:ligand complexes and
• 2x+1=y+z, and
• 2x′+1=y′+z′.