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Start Over Author "Hou, Ji" Publisher royal society of chemistry (rsc)
38 results on '"Hou, Ji"'

2. Silylium ion-mediated cage-opening functionalization of closo-B10H102− salts

Author

Yingying Wang, Hui Han, Jia-Xin Kang, Jiamin Peng, Xiongxiong Lu, Hou-Ji Cao, Zhenxing Liu, and Xuenian Chen

Subjects
Materials Chemistry, Metals and Alloys, Ceramics and Composites, General Chemistry, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials
Abstract

We found that trimethylsilyl trifluoromethanesulfonate (TMSOTf) can mediate boron-cage-opening instead of strong acids based on which an efficient method has been developed to regioselectively synthesize 6-substituted decaboranyl ethers and sulfides.

Published
2022

3. A switchable redox annulation of 2-nitroarylethanols affording N-heterocycles: photoexcited nitro as a multifunctional handle

Author

Bin Wang, Hongyuan Ren, Hou-Ji Cao, Changsheng Lu, and Hong Yan

Subjects
General Chemistry
Abstract

A cyclization strategy of 2-nitroarylethanols under blue-light irradiation was developed, which is triggered by a photoexcited nitro-induced double hydrogen atom abstraction (d-HAA) process, delivering indoles, N–OH oxindoles and N–H oxindoles.

Published
2022

6. Synthesis and characterization of bis(pyrazolyl)borate Ni(<scp>ii</scp>) complexes: ligand rearrangement and transformation

Author

Xiao-Hua Kong, Qianyi Zhao, Xuenian Chen, Peng-Hui Gao, Dou Ting, Guan Xinting, Ting Xu, Hou-Ji Cao, Jie Zhang, and Nana Ma

Subjects
Agostic interaction, 010405 organic chemistry, Ligand, chemistry.chemical_element, 010402 general chemistry, Cleavage (embryo), 01 natural sciences, Toluene, 0104 chemical sciences, Inorganic Chemistry, Specific orbital energy, chemistry.chemical_compound, Crystallography, chemistry, Boron, Selectivity, Dichloromethane
Abstract

Five examples of bis(pyrazolyl)borate Ni(ii) complexes 2-5, exhibiting C-HNi interactions, were readily prepared from the reactions of K[BBN(3-R1-4-R2-pz)2] with Ni(ii) precursors (Ni(acac)2 or NiCl2(PPh3)2) in dichloromethane or toluene. When R1 = R2 = H, complex 2a with square-planar geometry around the Ni centre and showing an unusual C-HNi anagostic interaction was obtained. In contrast, when R1 = Me, R2 = H or R1 = Me, R2 = Br, tetrahedral complexes 3 or 4 were formed preferentially with strong C-HNi agostic interactions, respectively. Additionally, some differences in the formation and transformation of 3 and 4 were also found including a 1,2-borotropic shift during the formation of 3 and a further geometrical transformation from tetrahedral 3 to square-planar 2b by the second 1,2-borotropic shift under continuous heating; in contrast, no ligand change and further conversion were found in 4. When the more hindered 3-iPr-substituted ligand 1d was introduced in the reaction, the hydrolysis and cleavage of one B-N bond in the ligand occurred, leading to the singly hydroxo-bridged complex 5. The experimental and theoretical results indicate that the preference to form a thermodynamically stable complex and then balancing with orbital energy should be the intrinsic reason for the reaction selectivity.

Published
2019

14. Catalyst design based on agostic interactions: synthesis, characterization, and catalytic activity of bis(pyrazolyl)borate copper complexes

Author

Qianyi Zhao, Jiaxuan Li, Jie Zhang, Ewan J. M. Hamilton, Xuenian Chen, Qian-Fan Zhang, Hou-Ji Cao, and Lai-Sheng Wang

Subjects
Steric effects, Agostic interaction, 010405 organic chemistry, Chemistry, Pyrazole, 010402 general chemistry, Photochemistry, 01 natural sciences, Medicinal chemistry, 0104 chemical sciences, Catalysis, Inorganic Chemistry, chemistry.chemical_compound, Intramolecular force, Yield (chemistry), Nonane, Carbenoid
Abstract

Agostic interactions are often used to activate inert C-H bonds, and thus facilitate new reactions. We report the first example of designed catalysts based on the agostic interaction. Novel copper(i) complexes [BBN(pz(x))2]Cu(PPh3)n (BBN = 9-borabicyclo[3.3.1]nonane; pz(x) = 3-substituted pyrazole; x = H, n = 2; x = Me, n = 1) and {[BBN(pz(iPr))2]Cu}2 have been synthesized and characterized. Single crystal studies of the three compounds show weak intramolecular C-HCu interactions which can be assigned as agostic or anagostic interactions. Catalytic studies of these complexes toward carbenoid insertion into N-H bonds indicate these weak interactions act as a "switch" which will be turned "on" if interacting with the substrate and "off" if eliminating the product and regenerating the weak interaction. The process of the "switch" turning "on" or "off", which is related to the catalytic effect, is found to be influenced by both steric effects and the solvent: a less sterically hindered catalyst in non-coordinating benzene results in high yield, while a more sterically hindered catalyst in coordinating THF results in relatively low yield.

Published
2016

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