Nickel-catalysed C O bond reduction of 2,4,6-triaryloxy-1,3,5-triazines in 2-methyltetrahydrofuran
作者:Yaoyao Wang、Jun Shen、Qun Chen、Liang Wang、Mingyang He
DOI:10.1016/j.cclet.2018.09.009
日期:2019.2
Abstract A nickel-catalysedreduction of phenol derivatives activated by 2,4,6-trichloro-1,3,5-triazine (TCT) in ecofriendly 2-methyltetrahydrofuran (2-MeTHF) is described. The phenol-TCT derivatives were readily prepared using grinding method in short time without further purification. This catalytic system allowed the facile C–O cleavage of phenol-TCT derivatives under mild reaction conditions with
Calcium(II)-Catalyzed Intermolecular Hydroarylation of Deactivated Styrenes in Hexafluoroisopropanol
作者:Chenxiao Qi、Vincent Gandon、David Lebœuf
DOI:10.1002/anie.201809470
日期:2018.10.22
A challenging catalytic hydroarylation of highly electron deficient styrenes has been developed on the basis of efficient cooperation between a calcium(II) triflimide salt and hexafluoroisopropanol (HFIP). This method affords a large variety of diaryl alkanes, notably diaryl ethanes, in good to excellent yields, and is simple to implement and compatible with various functional groups. Furthermore,
Chemo- and Regioselective Direct Hydroxylation of Arenes with Hydrogen Peroxide Catalyzed by a Divanadium-Substituted Phosphotungstate
作者:Keigo Kamata、Taiyo Yamaura、Noritaka Mizuno
DOI:10.1002/anie.201201605
日期:2012.7.16
Peroxide in, phenol out: The catalyst [γ‐PW10O38V2(μ‐OH)2]3− showed high activity in the hydroxylation of various aromatic compounds with aqueous H2O2. The system was regioselective, producing para‐phenols from monosubstituted benzene derivatives. Furthermore, alkylarenes with reactive side‐chain CH bonds could be chemoselectively hydroxylated without significant formation of side‐chain oxygenated
过氧化物,酚出:将催化剂[γ-PW 10 ö 38 V 2(μ-OH)2 ] 3-表明在各种芳族化合物与水性小时羟化活性高2 Ò 2。该系统具有区域选择性,可从单取代的苯衍生物生产对酚。此外,反应性侧链的C烷基芳烃 H键可以化学选择性羟基化而不显著形成的侧链氧化产物。
An increment system for deuterium isotope effects on13C chemical shifts of methylated benzenes
作者:Stefan Berger、Bernd W. K. Diehl
DOI:10.1002/mrc.1260241210
日期:1986.12
The complete series of all possible benzenes bearing one deuterium atom and one to five methyl groups was synthesized. The deuteriumisotopeeffects on the carbon chemicalshifts of the aromatic and aliphatic carbon atoms were measured and shown to obey an empirical increment system. The isotopeeffects over one bond correlate with the C,H spin coupling constants.