Formation of osmium- and ruthenium-cyclobutylidene complexes by ring expansion of alkylidenecyclopropanes.
Alkylidenecyclopropanes containing a chelation assistant at the terminal carbon atom of the olefinic moiety undergo an Os- or Ru-promoted ring expansion reaction to afford metal cyclobutylidene derivatives. The process occurs through a novel mechanism that implies a 1,2-migration of a CH(2) group of the three-membered ring from an olefinic carbon atom to the other one. It takes place, without direct participation of the metal, on a metallaheterocyclopentene intermediate which is generated from an eta(2)-methylenecyclopropane species stabilized by coordination of the chelation assistant.
Castro-Rodrigo
Ruth
R
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain.
Esteruelas
Miguel A
MA
Fuertes
Sara
S
López
Ana M
AM
López
Fernando
F
Mascareñas
José L
JL
Mozo
Silvia
S
Oñate
Enrique
E
Saya
Lucía
L
Villarino
Lara
L