Mechanochemical and Conventional Synthesis of Copper(II) Coordination Polymers Bearing Arylhydrazone of Acetoacetanilide and Their Catalytic Activity in Conversion of Acetone to Acetic Acid

Copper(II) coordination polymers, [Cu( μ 2 ‐HL)] n ⋅n(CH 3 ) 2 C=O ( 1 ), [Cu( μ 1 ‐HL)(CH 3 OH)] n ( 2 ) and [Cu( μ 1 ‐HL)(H 2 O)] n ( 3 ) were isolated by recrystallization (in acetone, methanol and dimethylformamide, respectively) of an intermediate produced by a solid state ball milling reaction of CuCl 2 ⋅2H 2 O with 2‐(2‐(1,3‐dioxo‐1‐(phenylamino)butan‐2‐ylidene)hydrazinyl)benzoic acid (H 3 L). Reaction under conventional fully solution‐based conditions of CuCl 2 ⋅2H 2 O with H 3 L in acetone and dimethylformamide leads to 3 , and in methanol to the known monomeric compound [Cu(HL 1 )(H 2 O)(CH 3 OH)] ( 4 ). All the coordination polymers 1 − 3 act as homogenous catalysts for the peroxidative (H 2 O 2 ) oxidation of acetone to acetic acid with yields up to 50% and at room temperature.