192823-42-0Relevant academic research and scientific papers
Synthesis and structural characterization of some novel metalloboroxides bearing boron-bound mesityl and fluoromesityl substituents: The molecular structure of the first metallaboroxane complex
Gibson, Vernon C.,Redshaw, Carl,Clegg, William,Elsegood, Mark R. J.
, p. 2637 - 2641 (1997)
Treatment of the new boronous acid HOB (fmes)2 (1) (fmes = 2,4,6-(CF3)3C6H2) with n-butyllithium in diethyl ether/pentane affords after work-up the dimer [Li(thf)OB(fmes)2]2 (2). Reaction of [Mo2(NMe2)6] with two equivalents of 1 in toluene gives the amido-boroxide complex Mo2(NMe2)4[OB(fmes)2]2 (3). Treatment of CuBr2 with LiOB(Mes)2 (mes = 2,4,6-Me3C6H2) in tetrahydrofuran affords after work-up and addition of excess pyridine the monomeric copper(II) boroxide {Cu[O3B2(mes)2]2[Li(CH 3CN)(C5H5N)]2} (4), containing the new ligand mesB(O)OB(O)mes, as a result of loss of mesitylene and formation of a B-O-B bond. 2 and 4 have been structurally characterized.
Bonding in Barium Boryloxides, Siloxides, Phenoxides and Silazides: A Comparison with the Lighter Alkaline Earths
Carpentier, Jean-Fran?ois,Cordier, Marie,Dorcet, Vincent,Hammoud, Joanna,Kahlal, Samia,Le Coz, Erwann,Roisnel, Thierry,Saillard, Jean-Yves,Sarazin, Yann
supporting information, p. 11966 - 11982 (2021/07/16)
Barium complexes ligated by bulky boryloxides [OBR2]? (where R=CH(SiMe3)2, 2,4,6-iPr3-C6H2 or 2,4,6-(CF3)3-C6H2), siloxide
Substituent Directed Phototransformations of BN-Heterocycles: Elimination vs Isomerization via Selective B-C Bond Cleavage
Yang, Deng-Tao,Mellerup, Soren K.,Peng, Jin-Bao,Wang, Xiang,Li, Quan-Song,Wang, Suning
supporting information, p. 11513 - 11516 (2016/11/15)
Electron-rich and -poor BN-heterocycles with benzyl-pyridyl backbones and two bulky aryls on the boron (Ar = tipp, BN-1, Ar = MesF, BN-2) have been found to display distinct molecular transformations upon irradiation by UV light. BN-1 undergoes an efficient photoelimination reaction forming a BN-phenanthrene with PE = 0.25, whereas BN-2 undergoes a thermally reversible, stereoselective, and quantitative isomerization to a dark colored BN-1,3,5-cyclooctatriene (BN-1,3,5-COT, BN-2a). This unusual photoisomerization persists for other BN-heterocycles with electron-deficient aryls such as BN-3 with a benzyl-benzothiazolyl backbone and MesF substituents or BN-4 with a benzyl-pyridyl backbone and two C6F5 groups on the boron. The photoisomerization of BN-4 goes beyond BN-1,3,5-COT (BN-4a), forming a new species (BN-1,3,6-COT, BN-4b) via C-F bond cleavage and [1,3]-F atom sigmatropic migration. Computational studies support that BN-4a is an intermediate in the formation of BN-4b. This work establishes that steric and electronic factors can effectively control the transformations of BN-heterocycles, allowing access to important and previously unknown BN-embedded species.
