Facile isolation of bisimines based on 3,3'-diaminobenzidine: direct access to unsymmetrical bimetallic salphen building blocks.
Diimines obtained from 3,3'-diaminobenzidine and tert-butyl-substituted salicylaldehydes in MeOH can be readily isolated in 60-90% yield and were obtained as a mixture of geometrical isomers. Two distinct diimine intermediates (4 and 5) with a higher molecular symmetry as related to the other isomeric diimine products were both isolated by crystallization of which 5 was subsequently used to demonstrate that nonsymmetrical bis-salphen complexes with different functional groups and metal centers can be assembled via a three-component one-pot procedure.
Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, 43007 Tarragona, Spain.
Simona
S
Curreli
Eduardo C
EC
Escudero-Adán
Jordi
J
Benet-Buchholz
Arjan W
AW
Kleij