Preparation of Polydopamine Sulfamic Acid-Functionalized Silica Gel as Heterogeneous and Recyclable Nanocatalyst for Acetylation of Alcohols and Amines Under Solvent-Free Conditions

Enhanced ester dechloroacetylation through transesterification with trimethoxyborane

A new strategy to remove the chloroacetyl group using B(OMe)3 and K3PO4 in the presence of organophosphine is described. The reaction was performed on O-AcCl-protected benzylic, aliphatic primary, aliphatic secondary, allyl, and propargyl alcohols and phenols to generate free alcohols and phenols in good to excellent yields. Synthetically valuable and sensitive functional groups such as bromo, carbonyl, and dioxol remained intact during the reaction. The control experiments and in situ1H NMR and 11B NMR tracking experiments were conducted to understand the reaction mechanism.

Replacing amine by azide: Dopamine azide polymerization triggered by sodium periodate

Polydopamine (PDA) have been widely described for a range of biomedical and surface engineering applications. However the structure of PDA remains elusive due to the insoluble nature of the polymer....