Titanium‐Mediated Catalytic Hydrogenation of Monocyclic and Polycyclic Arenes

Abstract

Abstract Two electron‐reduction of the Ti IV guanidinate complex (Im Dipp N)( Xyket guan)TiCl 2 gives (η 6 ‐Im Dipp N)( xyket guan)Ti ( 1 intra ) and (Im Dipp N)( Xyket guan)Ti(η 6 ‐C 6 H 6 ) ( 1 inter ) ( Xyket guan=[( t BuC=N)C(NXylyl) 2 ] − , Xylyl=2,5‐dimethylphenyl) in the absence or presence of benzene, respectively. These complexes have been found to hydrogenate monocyclic and polycyclic arenes under relatively mild conditions (150 psi, 80 °C)—the first example of catalytic, homogeneous arene hydrogenation with TON >1 by a Group IV system.