M. Beckett, Gary C. Strickland, K. Varma
Sep 1, 1995
Citations
0
Influential Citations
28
Citations
Journal
Polyhedron
Abstract
Abstract 19 1 : 1 adducts of the triarylboroxines (4-MeC 6 H 4 ) 3 B 3 O 3 (PTB) and (3,5-Me 2 C 6 H 3 ) 3 B 3 O 3 (MXB) with N -donor ligands (cyclohexylamine, 4-picoline, 3-picoline, piperidine, morpholine, isobutylamine, methylamine, dimethylamine, isoquinoline and benzylamine) have been prepared by reaction of stoichiometric quantities of ligand and tri-arylboroxine in Et 2 O at room temperature. All 19 adducts have been characterized by elemental analysis, M pt, IR and 1 H and 13 C NMR. C 6 H 11 NH 2 · PTB has been characterized in the solid state by a single-crystal X-ray diffraction study. Solid-state 11 B MAS NMR results for PTB and its adducts with cyclohexylamine and isoquinoline are reported. In solution-variable temperature 1 H NMR of the morpholine, cyclohexylamine, isoquinoline and benzylamine adducts of PTB and MXB indicate that a ligand dissociation-recombination process is occurring with ΔG ‡ of ca 43–49 kJ mol −1 .