Facile isolation of bisimines based on 3,3'-diaminobenzidine: direct access to unsymmetrical bimetallic salphen building blocks |
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Authors: | Curreli Simona Escudero-Adán Eduardo C Benet-Buchholz Jordi Kleij Arjan W |
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Affiliation: | Institute of Chemical Research of Catalonia (ICIQ), Av. Pa?sos Catalans 16, 43007 Tarragona, Spain. |
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Abstract: | 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. |
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