Rhodium-catalysed synthesis of multi-substituted silylindenes from aryl alkynes and hydrosilanes via C–H bond activation

2015 ◽  
Vol 51 (36) ◽  
pp. 7685-7688 ◽  
Author(s):  
Shunsuke Sueki ◽  
Yoichiro Kuninobu
Keyword(s):  
Bond Activation ◽  
First Time ◽  
Aryl Alkynes

We successfully developed rhodium-catalysed synthesis of multi-substituted silylindenes from 2 equivalents of aryl alkynes and 1 equivalent of hydrosilanes in moderate to good yields via C–H bond activation for the first time.

scholarly journals Annulation Cascade of Aryl Alkynes Induced by Alumina‐Mediated CF Bond Activation

2020 ◽  
Vol 257 (12) ◽  
pp. 2000296
Author(s):  
Mikhail Feofanov ◽  
Vladimir Akhmetov ◽  
Konstantin Amsharov
Keyword(s):  
Bond Activation ◽  
Aryl Alkynes

scholarly journals Ruthenium-catalyzed, site-selective C–H activation: access to C5-substituted azaflavanone

RSC Advances ◽  
2020 ◽  
Vol 10 (52) ◽  
pp. 31570-31574
Author(s):  
Manickam Bakthadoss ◽  
Tadiparthi Thirupathi Reddy ◽  
Duddu S. Sharada
Keyword(s):  
Bond Activation ◽  
Keto Group ◽  
A Site ◽  
Site Selective ◽  
First Time

A site-selective ruthenium-catalyzed keto group assisted C–H bond activation of 2-aryl tetrahydroquinoline (azaflavanone) derivatives has been achieved with a variety of alkenes for the first time.

scholarly journals α-C–C agostic interactions and C–H bond activation in scandium cyclopropyl complexes

2020 ◽  
Vol 7 (24) ◽  
pp. 4822-4831
Author(s):  
Cheng Xu ◽  
Guangyu Li ◽  
Michel Etienne ◽  
Xuebing Leng ◽  
Yaofeng Chen
Keyword(s):  
Bond Activation ◽  
Solution Nmr ◽  
Theoretical Studies ◽  
First Time

Electron deficient scandium cyclopropyl complexes have been synthesized and fully characterized for the first time, and a combination of solid XRD, solution NMR and theoretical studies well demonstrated the α-C–C agostic interactions in the complexes.

Rh(iii)- or Ir(iii)-catalyzed ynone synthesis from aldehydes via chelation-assisted C–H bond activation

2015 ◽  
Vol 51 (37) ◽  
pp. 7871-7874 ◽  
Author(s):  
Wen Ai ◽  
Yunxiang Wu ◽  
Huanyu Tang ◽  
Xueyan Yang ◽  
Yaxi Yang ◽  
...  
Keyword(s):  
Bond Activation ◽  
Reaction Conditions ◽  
Practical Synthesis ◽  
First Time

A simple and practical synthesis of ynones directly from readily available aldehydes was developed for the first time under mild reaction conditions via a Rh(iii)- or Ir(iii)-catalyzed formyl C–H bond activation.

A Regioselective Approach to C3-Aroylcoumarins via Cobalt-Catalyzed­ C(sp2)–H Activation Carbonylation of Coumarins

Synthesis ◽  
2019 ◽  
Vol 51 (15) ◽  
pp. 3014-3020
Author(s):  
Rahim Pashazadeh ◽  
Saideh Rajai-Daryasarei ◽  
Siyavash Mirzaei ◽  
Mehdi Soheilizad ◽  
Samira Ansari ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Bond Activation ◽  
Aryl Halides ◽  
Mild Conditions ◽  
Aryl Iodides ◽  
Manganese Powder ◽  
First Time

A new cobalt-catalyzed C–H bond activation of coumarins with aryl halides or pseudohalides and carbon monoxide insertion to give various 3-aroylcoumarin derivatives is described. It is the first time that CO as C1 feedstock is used as the coupling partners in cobalt-catalyzed regioselective coumarin C–H functionalization reactions. Upon activation with manganese powder, the Co catalyzes the C–H bond activation carbonylation reactions of aryl iodides, bromides, and even triflates under mild conditions, providing the regioselective aroylated products in moderate to good yields.

Palladium-catalyzed carbonylation of benzylic ammonium salts to amides and esters via C–N bond activation

2018 ◽  
Vol 16 (17) ◽  
pp. 3099-3103 ◽  
Author(s):  
Weijie Yu ◽  
Shuwu Yang ◽  
Fei Xiong ◽  
Tianxiang Fan ◽  
Yan Feng ◽  
...  
Keyword(s):  
Quaternary Ammonium ◽  
Bond Activation ◽  
Bond Cleavage ◽  
Quaternary Ammonium Salts ◽  
Ammonium Salts ◽  
Carbonylation Reaction ◽  
Palladium Catalyzed ◽  
First Time ◽  
Acid Esters

An efficient palladium-catalyzed carbonylation reaction of readily available quaternary ammonium salts with CO is reported for the first time to afford arylacetamides and arylacetic acid esters via benzylic C–N bond cleavage.

scholarly journals Bipyrrole boomerangs via Pd-mediated tandem cyclization–oxygenation. Controlling reaction selectivity and electronic properties

2020 ◽  
Vol 16 ◽  
pp. 895-903 ◽  
Author(s):  
Liliia Moshniaha ◽  
Marika Żyła-Karwowska ◽  
Joanna Cybińska ◽  
Piotr J Chmielewski ◽  
Ludovic Favereau ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Bond Activation ◽  
Reactive Systems ◽  
Quantum Yields ◽  
Luminescent Materials ◽  
Reaction Selectivity ◽  
Circularly Polarized ◽  
Donor Acceptor ◽  
Tandem Cyclization ◽  
First Time

Boomerang-shaped bipyrroles containing donor–acceptor units were obtained through a tandem palladium-mediated reaction consisting of a cyclization step, involving double C–H bond activation, and a double α-oxygenation. The latter reaction can be partly suppressed for the least reactive systems, providing access to α-unsubstituted boomerangs for the first time. These “α-free” systems are highly efficient fluorophores, with emission quantum yields exceeding 80% in toluene. Preliminary measurements show that helicene-like boomerangs may be usable as circularly polarized luminescent materials.

The singlet excited state of BODIPY promoted aerobic cross-dehydrogenative-coupling reactions under visible light

2015 ◽  
Vol 51 (56) ◽  
pp. 11256-11259 ◽  
Author(s):  
Xu-Zhe Wang ◽  
Qing-Yuan Meng ◽  
Jian-Ji Zhong ◽  
Xue-Wang Gao ◽  
Tao Lei ◽  
...  
Keyword(s):  
Excited State ◽  
Visible Light ◽  
Bond Activation ◽  
Coupling Reactions ◽  
Singlet Excited State ◽  
Triplet Excited State ◽  
Dehydrogenative Coupling ◽  
First Time

We disclose for the first time that the singlet excited state (1PS*) of BODIPY rather than triplet excited state (3PS*) can drive C–H bond activation to form C–C and C–P bonds smoothly upon irradiation by visible light.

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