Abstract
1. Steric hindrance by the barene ring affects the reactivities of aldehydes of the barene series. 2. Primary aliphatic amines and piperidine in hydrocarbon solvents split aldehydes of the barene series at the C-C bond with simultaneous splitting of the barene skeleton to the dicarbaundecaborane-(13) anion, whereas aromatic amines(aniline) smoothly form Schiff bases with barene aldehydes. 3. The action of piperidine on 1-methyl-2-benzoylbarene leads only to splitting to the dicarbaunde-caborane-(13) anion, the carbonyl group being retained. 4. In contrast to Ketones of the barene series, ketone derivatives of dicarbaundecaborane-(13) are resistant to hot alcoholic alkali.
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