Synthesis and characterization of 4,4′-methylenebis (2,6-di-tert-butylphenol) derivatives of a series of metal alkoxides and alkyls

Investigation of the coordination behavior of 4,4′-methylenebis(2,6-di-tert-butylphenol) (or H₂-4DBP) with a series of metal alkoxides led to isolation of [(OR)₃M]₂(µ-4DBP), where M/OR?=?Ti/OBu^t (2), Ti/ONep (3), Zr/OBu^t (4), Hf/OBu^t (5), and [(py)(OR)₃M]₂(µ-4DBP)?·?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(µ-4DBP)?·?py (6), [(THF)₃(Br)Mg]₂(µ-4DBP) (7), [(THF)₂(Br)Mg](µ-4DBP)[Mg(Br)(THF)₃]?·?(THF, tol) (7a), and [(py)(R)₂Al]₂(µ-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.     

Studies on the catalysis of the reaction of organotin phenoxides with bis(2,2,2‐trichloroethyl) azodicarboxylate by lithium perchlorate

Organotin phenoxides, which are distinctly more active than the corresponding phenols, react at room temperature with bis(2,2,2‐trichloroethyl) azodicarboxylate to produce para‐substituted phenolic hydrazides in high yields. Copyright © 2004 John Wiley & Sons, Ltd.     

Formation and properties of a catalyst based on sodium and potassium hydroxides in the reaction of 2,6-di-tert-butylphenol with methyl acrylate

The nature of the cation (K⁺ or Na⁺) in hydroxides affects the temperature plot of the equilibrium constant of the reaction of KOH and NaOH with 2,6-di-tert-butylphenol (ArOH) and the conversion of EII and (or) NaOH to potassium or sodium 2,6-di-tert-butyl phenoxides, which are catalysts for the alkylation of ArOH by methyl acrylate. The kinetic method for determination of the composition of the catalyst formed from NaOH and ArOH was proposed. The nature of the cation in phenoxides ArOK or ArONa is a factor determining the kinetics of the reaction of ArOH with methyl acrylate. Two different kinetic schemes were proposed to describe the transformation of ArOH in the presence of ArONa or ArOK.