Preparation and Characterization of Dichlorocyclopentadienylborane; and Attempted Preparation of 1-Chloro-2,3,4,5,6-Pentacaba-nido-Hexaborane Cation.

Dichlorocyclopentadienylborane was obtained from the reaction of sodium cyclopentadienide with boron trichloride. Placement of the double bonds is probably 1,3 from available nuclear magnetic resonance data. Butyl lithium removes a proton from the cyclopentadienyl ring to give the aromatic Cl2B-C5H4- anion. Attempts to remove chloride ion from dichlorocyclopentadienylborane to form a B-chloro derivative of the nido C5BH6 resulted, instead, in a polymeric decomposition. Author