Synthesis and Crystal Structures of Chiral Titanium Bis(sulfonamido) Bis(amide) Complexes: Differences in Ligand Hapticity Caused by Crystal Packing Forces

Titanium bis(sulfonamido) bis(amide) complexes 3rac and 3res were prepared by the reaction of racemic and resolved bis(sulfonamide) ligands 2rac and 2res with Ti(NMe 2 ) 4 and have been crystallographically characterized. For both 3rac and 3res, the bis(sulfonamido) ligand binds through the oxygens of the sulfonyl group as well as through the nitrogen atoms. Coordination of the ligand in 3rac and 3res (η 4 or η 3 ) is different due to the crystal packing forces.