Synthesis of bent [4]phenylene (cyclobuta[1,2-a:3,4-b']bisbiphenylene) and structure of a bis(trimethylsilyl) derivative: the last [4]phenylene isomer.
The syntheses of the title compounds were accomplished by cobalt-catalyzed alkyne cyclotrimerizations using two strategies; the properties of the bent phenylene frame reflect the combined effects of benzocyclobutadienofusion of the component [3]phenylene substructures.
Bong
Dennis T Y
DT
Center for New Directions in Organic Synthesis, Department of Chemistry, University of California at Berkeley, Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA.
Gentric
Lionel
L
Holmes
Daniel
D
Matzger
Adam J
AJ
Scherhag
Frank
F
Vollhardt
K Peter C
KP