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.
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.
Dennis T Y
DT
Bong
Lionel
L
Gentric
Daniel
D
Holmes
Adam J
AJ
Matzger
Frank
F
Scherhag
K Peter C
KP
Vollhardt