Latent low-coordinate titanium imides supported by a sterically encumbering (beta)-diketiminate ligand

Addition of an equal molar quantity of R-(R = Me, SiMe3) to complex (Nacnac)Ti=NAr(OTf)(Nacnac-=[ArNC(tBu)]2CH, Ar = 2,6iPr2C6H3) forms the imido alkyl (Nacnac)Ti=NAr(R), which can be readily protonated to afford [(Nacnac)Ti=NAr(L)]+(L = THF, Et2O, (eta)^1-C6H5NMe2), or treated with B(C6F5)3 to afford the zwitterion (Nacnac)Ti=NAr((mu)-CH3)B(C6F5)3.