A new type of asymmetric tridentate pyrrolyl-linked pincer ligand and lts aluminum dihydride complexes

The new pyrrolyl-linked pincer-type ligand, [C₄H ₂NH(2-CH₂NH^tBu)(5-CH₂NMe ₂)] (1), that has been employed conveniently in high yield by treatment of (2-t-butylaminomethyl)pyrrole with 1 equiv of formaldehyde and dimethylamine hydrochloride each in diethylether and its corresponding aluminum derivative, [C₄H₂N(2-CH₂NH^tBu)(5- CH₂NMe₂)]AlH₂ (2), that has been generated from Me₃N.AlH₃ using diethylether as a solvent are described. Furthermore, reactions of 2 with 2 equiv of either 1,3-diphenylpropane-1,3-dione in diethylether or phenyl thioisocyanate in dichloromethane interestingly formed [C₄H₂N(2-CH₂NH^tBu)(5-CH ₂NMe₂)]Al(PhCOCHCOPh)₂ (3) and [C ₄H₂N(2-CH₂NH^tBu)(5-CH ₂NMe₂)]Al(SCHNPh)₂ (4), respectively, following deprotonation or hydroalumination reaction kinetics under a dry nitrogen environment. All of the compounds have been subjected to the X-ray diffraction technique in the solid state as well as characterized by NMR spectra.