Article

 

Dimeric Boronates Derived from the Reaction of Schiff Bases and Boronic Acids

 

Victor Barba^a, Rosa Santillan^b and Norberto Farfán*^,b

 

^a Centro de Investigaciones Químicas, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, CP 62210 Cuernavaca, Morelos, México

^b Departamento de Química, Centro de Investigación y de Estudios Avanzados del IPN, 07000, A.P. 14-740, México D. F., México. * e-mail: jfarfan@cinvestav.mx

 

Received: November 4, 2004
Published on the web: April 13, 2005

 

Abstract

The one-pot synthesis of dimeric boron complexes is reported. The compounds were obtained by reaction of Schiff bases (tridentate ligands) with trans-β-phenylvinylboronic acid, 3-thiopheneboronic acid and methylboronic acid. Building of the dimeric structures is favored by the presence of intramolecular N→B coordination bonds, resulting in the formation of ten-membered ring heterocycles. An X-ray crystallographic analysis for one of them confirmed the dimeric nature of these compounds.

Keywords: tridentate ligands, boron, Schiff base, macrocyclic chemistry

 

Resumo

A síntese one-pot de complexos diméricos de boro é descrita. Os compostos foram obtidos pela reação de bases de Schiff (ligantes tridentados) com ácido trans-β-fenilvinilborônico, ácido 3-tiofeninoborônico e ácido metilborônico. A construção das estruturas diméricas é favorecida pela presença de ligações de coordenação N→B intramoleculares, resultando na formação de anéis heterociclicos de dez membros. A análise cristalográfica de raio X de um deles confirmou a natureza dimérica desses compostos.

 

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