Synthesis and crystal structures of boratranes with methyl substituents on the atrane cage

Dimeric alumatranes as catalysts for trimethylsilylcyanation reaction

“…Thus, the introduction of steric congestion in the vicinity of the hydroxyl groups of the triethanolamine ligands could inhibit oligomer formation. Using this idea, we have successfully prepared monomeric boratranes, 42 monomeric germatranes, 43 and monomeric or dimeric titanatranes. [44][45][46] This idea further prompted us to prepare alumatranes with tricyclic ve-membered rings, which may be dimeric in the gas phase, solution phase, and solid state.…”

“…17,[34][35][36][37][38] The sum of the O eq -Al-O eq angles (:O1-Al-O2 + :O1-Al-O3 + :O2-Al-O3) are 358. 52 Even though boron and aluminum, which are in the same group of the periodic table, have similar chemical properties, boratranes 42 and alumatranes chelated by L1-L3 are monomeric and dimeric, respectively. In addition, titanatranes showed dramatic dimer-to-monomer structural changes induced by an increase of steric hindrance in the side arm of the tetradentate ligands.…”

Zinc(II) and Cadmium(II) Complexes with Rigid 3,3′,5,5′-Tetra(1H-imidazol-1-yl)-1,1′-biphenyl and Varied Carboxylate Ligands

“…The construction of coordination polymers with novel structures and topologies has attracted great attention of chemists not only owing to their undisputed array of structures such as bowl, cage, helix, self-penetrating/interpenetrating frameworks, etc., but also because of their potential applications in gas storage/separation, optics, and so on. − According to the previously reported studies, tetradentate ligand with nitrogen donors, for example, 1,2,4,5-tetrakis­(imidazol-1-ylmethyl)­benzene, 4,4′,6,6′-tetrakis­(4-pyridyl)­bimesityl, and 3,3′,5,5′-tetrakis­(3-pyridyl)-1,1′-biphenyl have been demonstrated to be powerful building blocks in the assembly of metal–organic frameworks (MOFs) with novel structures and topologies of corundum, diamond, PtS, etc. − On the other hand, many outstanding research studies have been carried out using carboxylate ligands such as terephthalic acid, 1,3,5-benzenetricarboxylic acid, 1,4-benzenediacrylic acid, 1,4-benzenediacetic acid, and 1,3-benzenediacetic acid to build MOFs with diverse structures and interesting properties. − Moreover, the carboxylate ligands have enriched coordination modes. On the basis of the advantage of nitrogen donor and carboxylate ligands, the strategy using mixed carboxylate and nitrogen donor ligands has came into play in the construction of MOFs. − Until now, much research based on mixed imidazole-containing ligand and multicarboxylate has been carried out.…”

Unexpected boratranes: BBr3 mediated synthesis and mechanistic insights

“…1. General chemical structure of atranes Classical methods for the synthesis of boratranes use boric acid [11] [12] or trialkyl borate [13] [14] [15] as reagent in various organic solvents or without solvent. In most cases, the reactions require prolonged reaction time under reflux and removal of released water from the reaction mixture by distillation.…”