Synthesis of boron-containing tyrosine derivatives based on the closo-decaborate and closo-dodecaborate anions

Blue Emitting Star-Shaped and Octasilsesquioxane-Based Polyanions Bearing Boron Clusters. Photophysical and Thermal Properties

“…Decoration of the star-shaped core 1,3,5-Tris(4-hydroxyphenyl)benzene (1) with the anionic boron clusters was performed via nucleophilic ring-opening reaction of their oxonium-derivatives [92], i.e., [Bu4N][B12H11(C4H8O2)] (2) and [3,3′-Co(8-C4H8O2-1,2-C2B9H10)(1′,2′-C2B9H11)] (3) [93,94]. Compound 4 was prepared following previously described conditions [95][96][97][98][99][100]: Firstly, deprotonation of hydroxy groups in 1 with K2CO3 takes place, and secondly, phenoxy moieties undergo a nucleophilic attack promoting the ring-opening reaction of 2. In a similar manner, compound 5 was synthesised from 1 and COSAN derivative 3 using NaH as a deprotonating agent.…”

Focus on Chemistry of the 10-Dioxane-nido-7,8-dicarba-undecahydrido Undecaborate Zwitterion; Exceptionally Easy Abstraction of Hydrogen Bridge and Double-Action Pathways Observed in Ring Cleavage Reactions with OH− as Nucleophile

“…This compound belongs to a large and rapidly growing family of species that contain an ether ring attached to the boron cage via an oxonium atom [9][10][11][12]. All other members are derived from closo-borate ions such as cobalt bis(dicarbollide) [13,14], decaborate [15,16], dodecaborate [17][18][19], or 1-carba-undecahydroundecaborate [20]; most of which have been used in numerous emerging applications, among others, advanced materials [21,22], organic conducting polymers [23,24], radionuclide partitioning [25,26], biology, and medicine [8,[27][28][29][30][31][32][33][34][35][36][37]. Surprisingly enough, the nidosystem from this family of compounds, namely compound 1, has largely remained outside the stream of main interest, despite its potential for the introduction of open-cage boron polyhedra to functional molecules and materials.…”