Formation of a macrocycle from dichlorodimethylsilane and a pyridoxalimine Schiff base ligand

The reaction of dichlorodimethylsilane with a polydentate Schiff base ligand derived from pyridoxal and 2-ethanolamine yielded the macrocyclic silicon compound (8 E ,22 E )-4,4,12,18,18,26-hexamethyl-3,5,17,19-tetraoxa-8,13,22,27-tetraaza-4,18-disilatricyclo[22.4.0.0 10,15 ]octacosa-1(24),8,10,12,14,22,25,27-octaene-11,25-diol, C 24 H 36 N 4 O 6 Si 2 . The asymmetric unit contains the half macrocycle with an intramolecular O—H...N hydrogen bond between the imine nitrogen atom and a neighbouring oxygen atom. The crystal structure is dominated by C—H...O and C—H...π interactions, which form a high ordered molecular network.