42014-60-8Relevant articles and documents
C-H borylation by platinum catalysis
Furukawa, Takayuki,Tobisu, Mamoru,Chatani, Naoto
, p. 332 - 342 (2017/05/09)
Herein, we describe the platinum-catalyzed borylation of aromatic C-H bonds. N-Heterocyclic carbene-ligated platinum catalysts are found to be efficient catalysts for the borylation of aromatic C(sp2)-H bonds when bis(pinacolato)diboron is used as the boron source. The most remarkable feature of these Pt catalysts is their lack of sensitivity towards the degree of steric hindrance around the C-H bonds undergoing the borylation reaction. These Pt catalysts allow for the synthesis of sterically congested 2,6-disubstituted phenylboronic esters, which are otherwise difficult to synthesize using existing C-H borylation methods. Furthermore, platinum catalysis allows for the site-selective borylation of the C-H bonds ortho to fluorine substituents in fluoroarene systems. Preliminary mechanistic studies and work towards the synthetic application of this platinum catalyzed C-H borylation process are described.
An electroluminescent compound and an electroluminescent device comprising the same
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Paragraph 0291; 0296-0299, (2016/10/08)
The present invention relates to an organic light emitting compound represented by chemical formula 1, and an organic electroluminescent device comprising the same. The organic light emitting compound according to the present invention increases PL quantu
C-H Functionalization at Sterically Congested Positions by the Platinum-Catalyzed Borylation of Arenes
Furukawa, Takayuki,Tobisu, Mamoru,Chatani, Naoto
supporting information, p. 12211 - 12214 (2015/10/12)
Despite significant progress in the area of C-H bond functionalization of arenes, no general method has been reported for the functionalization of C-H bonds at the sterically encumbered positions of simple arenes, such as mesitylene. Herein, we report the development of the first platinum-based catalyst for C-H borylation of arenes and heteroarenes. Notably, this method exhibited high tolerance toward steric hindrance and provided rapid access to a series of 2,6-disubstituted phenylboronic esters, valuable building blocks for further elaborations.
Oligomerization of ethylene using new tridentate iron catalysts bearing α-diimine ligands with pendant S and P donors
Small, Brooke L.,Rios, Ray,Fernandez, Eric R.,Gerlach, Deidra L.,Halfen, Jason A.,Carney, Michael J.
experimental part, p. 6723 - 6731 (2011/03/17)
Stoichiometric Schiff base condensations of sterically bulky primary amines with acenaphthenequinone yield isolable monoimines. In the presence of iron(II) chloride, the remaining ketone reacts with a second primary amine bearing a pendant donor atom to g
Tellurium mediated reduction of aromatic nitro groups
Khan, Rabat H.
, p. 290 - 291 (2007/10/03)
Treatment of a wide range of aromatic nitro compounds with tellurium powder in aqueous methanolic ammonium chloride results in selective reduction of the nitro groups; ester, nitrile, amide and halide substituents are unaffected.
Metacyclophanes and Related Compounds. Part 16. Preparation of 8-Fluoro-t-butylmetacyclophanes and their Treatment with Aluminium Chloride-Nitromethane in Benzene
Yamato, Takehiko,Arimura, Takashi,Tashiro, Masashi
, p. 1 - 8 (2007/10/02)
The preparation of 8-fluoro-t-butylmetacyclophanes (5) are described.Dithiametacyclophane (3) and metacyclophane bis(sulphones) (4) were obtained as a mixture of transoid and cisoid conformers, but metacyclophanes (5) were exclusively obtained as the transoid conformer after pyrolysis of the sulphones (4).AlCl3-MeNO2-Catalyzed trans-t-butylation of 8-fluoro-16-methyl-5,13-di-t-butylmetacyclophane (5a) in benzene under a variety of conditions faild to give 8-fluoro-16-methylmetacyclophane (32) but, instead, the tetrahydropyrenes (33) and/or (34) were obtained depending upon the conditions used.Internally substituted metacyclophanes were isomerized to the strainless metacyclophanes and these were then oxidized to the tetrahydropyrene (33).
REDUCTION OF AROMATIC NITRO COMPOUNDS WITH SODIUM TELLURIDE
Suzuki, Hitomi,Manabe, Hajime,Inouye, Masahiko
, p. 1671 - 1674 (2007/10/02)
Sodium telluride, prepared by heating tellurium with Rongalite in aqueous sodium hydroxide, easily reduces aromatic nitro compounds to the corresponding amines in good yields.The reduction can be carried out using a catalytic amount of tellurium, since sodium telluride is readily regenerated in the presence of excess Rongalite.
REDUCTION OF AROMATIC AND ALIPHATIC NITRO COMPOUNDS BY SODIUM HYDROGEN TELLURIDE
Osuka, Atsuhiro,Shimizu, Hirohito,Suzuki, Hitomi
, p. 1373 - 1374 (2007/10/02)
Various nitro compounds were effectively reduced by sodium hydrogen telluride in good yields.Thus, reductive conversion of unhindered nitrobenzenes to azoxybenzenes, sterically hindered nitrobenzenes to anilines, nitroalkanes to dimer of nitrosoalkanes, and vicinal-dinitroalkane to olefin was achieved.