A para-substituted bis(3-aminopropyl)hexaisobutyl-polyhedral oligomeric silsesquioxane (POSS) was successfully synthesized via a selective corner-opening reaction of 3-aminopropylheptaisobutyl-POSS and a subsequent corner-capping reaction. The selectivity of the corner-opening reaction was studied by density functional theory calculations. Polymerization of the POSS monomer with pyromellitic dianhydride resulted in a yellow, self-standing film.
A Site-isolated Lewis Acidic Aluminum and Brønsted Basic Amine Sites in Dimeric Silsesquioxane Cage as a Reusable Homogeneous Bifunctional Catalyst for One-pot Tandem Deacetalization/Deketalization-Knoevenagel Condensation Reactions
作者:Pushparaj Loganathan、Renjith S. Pillai、Abigail G. Jennifer、E. Varathan、M. Kesavan、Swaminathan Shanmugan
DOI:10.1039/d3nj00276d
日期:——
deacetalization-Knoevenagel condensation reactions and showed high efficiency (>90%) under optimized conditions (DMF, 0.3 mol% catalyst loading and 80 °C) with different reaction times. Furthermore, the bifunctional Al-POSS-NH2 catalyst was separated from the reaction mixture via the precipitation method by adding acetonitrile into the reaction mixture and reusing it for five consecutive cycles without