51036-91-0Relevant articles and documents
Electrochemical [4+2] Annulation-Rearrangement-Aromatization of Styrenes: Synthesis of Naphthalene Derivatives
Ma, Yueyue,Lv, Jufeng,Liu, Chengyu,Yao, Xiantong,Yan, Guoming,Yu, Wei,Ye, Jinxing
supporting information, p. 6756 - 6760 (2019/04/17)
We report the first electrochemical strategy to synthesize functionalized naphthalene derivatives through [4+2] annulation—rearrangement–aromatization from styrenes under mild conditions. The electrolysis does not require metals, oxidants and high valence substrates, indicating the atom and step-economy ideals. The dehydrodimer produced through [4+2] cycloaddition of 4-methoxy α-methyl styrene is isolated and proved to be the key intermediate for the following oxydehydrogenation to form carbon cation, which undergoes rearrangement–aromatization to afford the final products. This reaction represents a powerful access to construct multi-substituted naphthalene blocks in a single step.
Generation of VBr? VBi? VO?? defect clusters for 1O2 production for molecular oxygen activation in photocatalysis
Ding, Jie,Dai, Zan,Tian, Fan,Zhou, Bo,Zhao, Bin,Zhao, Huiping,Chen, Zhiquan,Liu, Yunling,Chen, Rong
supporting information, p. 23453 - 23459 (2017/11/30)
Defect engineering on a semiconductor surface can provide coordinatively unsaturated sites for molecular oxygen activation in photocatalysis. In this work, we demonstrated that the vacancy type was key to modulate the molecular oxygen activation process on BiOBr nanosheets. By regulating the reaction time, an oxygen vacancy (VO??), a double atom defect cluster (VBi? VO??) and triple atom clusters (VBi? VO?? VBi? and VBr? VBi? VO??) were accordingly generated on the surface, subsurface and bulk of BiOBr. More importantly, the newly-discovered VBr? VBi? VO?? defect cluster was highly related to the singlet oxygen (1O2) production ability of BiOBr. Meanwhile, the excellent photocatalytic selective oxidation reactions were successfully realized over BiOBr with the VBr? VBi? VO?? defect cluster. In addition, time-dependent defect cluster generation and the associated molecular oxygen activation were discussed.
MISE EN EVIDENCE DE LA DEPROTONATION DU COMPLEXE IPSO-ARENIUM OBTENU EN PHENYLATION CATIONIQUE DU DIMETHYL-1,4 NAPHTALENE
Court, J.,Ioakimoglou, H.,Lambeaux, C.,Bonnier, J. M.
, p. 5601 - 5606 (2007/10/02)
The phenyl cations obtained from the thermolysis of benzenediazonium tetrafluoroborate react with 1,4-dimethylnaphthalene in DMSO to give 1-methyl 4-methylene 1-phenyl 1,4-dihydronaphthalene as well as the phenylation products at positions 2,5 and 6.The formation of the former provides direct evidence for the attack of C6H5+ ipso to the methyl group.Either in pure 1,4-dimethylnaphthalene or in acetonitrile solution, the deprotonation of the ipso-arenium ions has not been observed and the main reaction was the 1-2 migration of the phenyl group.The reactivity of the ipso position in regard to attack by phenyl cations and the reactivity of the 2 position are very similar. 1-methyl 4-phenyl naphthalene has not been detected by G L C so that demethylphenylation of 1,4-dimethylnaphthalene must be negligible.
