Synthesis and characterization of 4,4′-methylenebis (2,6-di-tert-butylphenol) derivatives of a series of metal alkoxides and alkyls
摘要:
Investigation of the coordination behavior of 4,4'-methylenebis(2,6-di-tert-butylphenol) (or H-2-4DBP) with a series of metal alkoxides led to isolation of [(OR)(3)M](2)(mu-4DBP), where M/OR Ti/OBut (2), Ti/ONep (3), Zr/OBut (4), Hf/OBut (5), and [(py)(OR)(3)M](2)(mu-4DBP)center dot py (5a), where py = pyridine and ONep = OCH2C(CH3)(3). Metal alkyl derivatives of 4DBP were also studied and found to form similar di-substituted species: [(py)(2)(Et)Zn](2)(mu-4DBP)center dot py (6), [(THF)(3)(Br)Mg](2)(mu-4DBP) (7), [(THF)(2)(Br) Mg](mu-4DBP)[Mg(Br)(THF)(3)]center dot(THF, tol) (7a), and [(py)(R)(2)Al](2)(mu-4DBP), where R = CH3 (8), Et (9), CH2CH(CH3)(2) (10); tol = toluene and THF tetrahydrofuran. All structures demonstrate the bridging nature of 4DBP and the ability to bind a variety of metal centers. Solution state NMR indicates that the structures of 2-10 are retained in solution. Thermal analyses indicate that 4DBP is preferentially lost during heating.