Separation of Five Linearly Aligned Carbons into Two-Carbon and Three-Carbon Groups on Titanium

Five carbons linearly aligned in a dihydroindene titanium complex were separated into a two-carbon group and a three-carbon group on titanium when the complex was treated with 2-aminopyridine. The protonolysis product, dihydroindene with two alkyl groups at both bridge-head positions, was obtained in high yield.