Dihydrobiphenylenes through ruthenium-catalyzed [2+2+2] cycloadditions of ortho-alkenylarylacetylenes with alkynes.
A new synthetic route to dihydrobiphenylenes has been developed. The process involves a mild Ru(II) -catalyzed [2+2+2] dimerization of ortho-alkenylarylacetylenes or its more versatile variant, the Ru-catalyzed [2+2+2] cycloaddition of ortho-ethynylstyrenes with alkynes. Mechanistic aspects of this [2+2+2] cycloaddition are discussed.
Departamento de Química Orgánica y Centro Singular de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago de Compostela, 15782 Santiago de Compostela (Spain) http://www.usc.es/gi1603/saa.
Silvia
S
García-Rubín
Carlos
C
González-Rodríguez
Cristina
C
García-Yebra
Jesús A
JA
Varela
Miguel A
MA
Esteruelas
Carlos
C
Saá
[2+2+2] cycloadditions; alkynes; biphenylenes; ortho-alkenylarylacetylenes; ruthenium