The author of 《High Glass-Transition Temperature Polymer Networks Harnessing the Dynamic Ring Opening of Pinacol Boronates》 were Brunet, Juliette; Collas, Franck; Humbert, Matthieu; Perrin, Lionel; Brunel, Fabrice; Lacote, Emmanuel; Montarnal, Damien; Raynaud, Jean. And the article was published in Angewandte Chemie, International Edition in 2019. HPLC of Formula: 24388-23-6 The author mentioned the following in the article:
Differential scanning calorimetry of high molar mass poly(4-vinylphenylboronic acid, pinacol ester)s evidenced unusual reactive events above 120 °C, resulting in a high glass-transition temperature of 220 °C. A reversible ring-opening reactivity of pinacol boronates is proposed, involving a nucleophilic attack on the sp2 boron and subsequent bridging between boron atoms by interconnected pinacol moieties to form a densely crosslinked network with high Tg. FTIR, solid-state NMR investigations, and rheol. studies on the polymer as well as double-tagging analyzes on mol. model structures and theor. calculations further support this hypothesis and indicate a ring-opening inducing crosslinking. When diluted in an apolar solvent such as toluene, the polymer network can be resolubilized via ring closing, thus recovering the entropically favored linear chains featuring cyclic boronate esters. In addition to this study using 4,4,5,5-Tetramethyl-2-phenyl-1,3,2-dioxaborolane, there are many other studies that have used 4,4,5,5-Tetramethyl-2-phenyl-1,3,2-dioxaborolane(cas: 24388-23-6HPLC of Formula: 24388-23-6) was used in this study.
4,4,5,5-Tetramethyl-2-phenyl-1,3,2-dioxaborolane(cas: 24388-23-6) can be used to prepare sulfinamide derivatives by reacting with diethylaminosulfur trifluoride (DAST) and potassium phenyltrifluoroborate.HPLC of Formula: 24388-23-6
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