A convenient method to access a broad variety of N-alkyl-(2,2,6,6)-tetramethylpiperidin-4-ol compounds is reported. The thermal treatment of a mixture of (2,2,6,6)-tetramethylpiperidin-4-ol and allyl or benzyl bromide derivatives gave the corresponding N-alkylated compounds in good yields while leaving the hydroxyl functional group intact. Whereas 40 h were needed to reach complete conversion, microwave irradiation allowed the reaction time to be reduced (20 min) and improved the yields in most cases. (C) 2018 Elsevier Ltd. All rights reserved.
Phosphinous Acid Platinum Complex as Robust Catalyst for Oxidation: Comparison with Palladium and Mechanistic Investigations
The use of phosphinous acids as ligands of palladium or platinumcomplexes allows the formation of very stable catalytic systems. Efficient anaerobic oxidation of unreactive alcohols is achieved without degradation of the catalyst. Mechanistic investigations give evidence of the implication of a platinum hydroxyl species.