Chiral-at-metal tetrahydrosalen complexes of resolved titanium(IV) sec-butoxides: Ligand wrapping and multiple asymmetric catalytic induction

The reaction of the racemic and resolved tetrahydrosalen derivative LH2 (LH2 = N,N′-bis(3,5-dichloro-2-hydroxybenzyl)-trans-1,2-diaminocyclohexane) with the resolved titanium(IV) sec-butoxides, Ti(OR-2Bu)4 or Ti(OS-2Bu)4, affords a series compounds, LTi(O2Bu)2, which have been investigated as asymmetric Lewis acid catalysts.