The reaction of acetone with [Cu(en) 2] 2+: the crystal structure of the copper(II)-β-aminoketone complex initially formed and the kinetics of its base-catalysed conversion to the copper(II) complex of trans[14]dieneN 4

Abstract

The copper(II) complex of the β-aminoketone 14-amino-4,4,9,11,11-pentamethyl-5,8,12-triazatetradec-8-en-2-one (L), [CuL](ClO 4) 2·MeCN has been prepared and its structure established by X-ray crystallography. C 18H 37N 5O 9Cl 2Cu, triclinic, space group P 1 a = I0.752(9), β = 15.980(10), c = 8.112(7), α = 100.24(7), β = 95.43(7), γ = 93.54(6), V = 1361(1) A ̊ 3, Z = 2 . In basic solution the complex undergoes base-catalysed ring closure to give the copper(II) complex of the macrocycle trans[14]dieneN 4 The kinetics of the ring closure reaction have been studied in detail. Ring closure occurs by an intramolecular reaction involving the hydroxocomplex [CuLOH] +.