DBU-promoted ring-opening reactions of multi-substituted donor–acceptor cyclopropanes: access to functionalized chalcones with a quaternary carbon group

2020 ◽  
Vol 18 (45) ◽  
pp. 9210-9215
Author(s):  
Naili Luo ◽  
Jiamin Liu ◽  
Shan Wang ◽  
Cunde Wang
Keyword(s):  
Transition Metal ◽  
Ring Opening ◽  
Metal Catalyst ◽  
Quaternary Carbon ◽  
Transition Metal Catalyst ◽  
Ring Opening Reactions ◽  
Donor Acceptor

A strategy to synthesize highly stereoselective chalcones with alkylcyanoacetate subunits via DBU-promoted ring-opening reactions of multi-substituted D–A cyclopropanes has been developed without the requirement of a transition metal catalyst and extra solvent.

COx-free hydrogen production via ammonia decomposition over mesoporous Co/Al2O3 catalysts with highly dispersed Co species synthesized by a facile method

2021 ◽  
Author(s):  
Yingqiu Gu ◽  
Di Xu ◽  
Yun Huang ◽  
Zhouyang Long ◽  
Guojian Chen
Keyword(s):  
Fuel Cells ◽  
Hydrogen Production ◽  
Transition Metal ◽  
Transition Metals ◽  
Ammonia Decomposition ◽  
Metal Catalyst ◽  
Facile Synthesis ◽  
Transition Metal Catalyst ◽  
Highly Dispersed ◽  
Free Hydrogen

Transition metals have been considered as potential catalysts for ammonia decomposition to produce COx-free hydrogen for fuel cells. However, the facile synthesis of transition metal catalyst with small size active...

Recent Advances in Transition Metal Catalyzed C-H Functionalization Reactions Involving Aza/Oxabicyclic Alkenes

Synthesis ◽  
2021 ◽  
Author(s):  
Masilamani Jeganmohan ◽  
Pinki Sihag
Keyword(s):  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Ring Opening ◽  
Bond Activation ◽  
Considerable Progress ◽  
Double Bonds ◽  
Facial Selectivity ◽  
Ring Opening Reactions ◽  
Metal Catalyzed

Bicyclic alkenes, including Oxa- and azabicyclic alkenes can be readily activated by using transition-metal complexes with facial selectivity, because of the intrinsic angle strain on carbon-carbon double bonds of these unsymmetrical bicyclic systems. During last decades considerable progress has been done in the area of ring-opening of bicyclic strained ring by employing the concept of C-H activation. This Review comprehensively compiles the various C-H bond activation assisted reactions of oxa- and azabicyclic alkenes, viz., ring-opening reactions, hydroarylation as well as annulation reactions.

Hydrolytic ring opening reactions of anhydrides for first row transition metal dicarboxylate complexes

Polyhedron ◽  
2007 ◽  
Vol 26 (15) ◽  
pp. 4518-4524 ◽  
Author(s):  
Abhilasha M. Baruah ◽  
Anirban Karmakar ◽  
Jubaraj B. Baruah
Keyword(s):  
Transition Metal ◽  
Ring Opening ◽  
Ring Opening Reactions

scholarly journals Transition Metal Catalyst‐Free, Base‐Promoted 1,2‐Additions of Polyfluorophenylboronates to Aldehydes and Ketones

2021 ◽  
Author(s):  
Zhiqiang Liu ◽  
Goutam Kumar Kole ◽  
Yudha P. Budiman ◽  
Ya-Ming Tian ◽  
Alexandra Friedrich ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Catalyst ◽  
Free Base ◽  
Transition Metal Catalyst ◽  
Catalyst Free ◽  
Aldehydes And Ketones

Pyridine mediated transition-metal-free direct alkylation of anilines using alcohols via borrowing hydrogen conditions

2020 ◽  
Vol 56 (88) ◽  
pp. 13607-13610 ◽  
Author(s):  
Rajagopal Pothikumar ◽  
Venugopal T Bhat ◽  
Kayambu Namitharan
Keyword(s):  
Transition Metal ◽  
Traditional Approach ◽  
Metal Catalyst ◽  
Transition Metal Catalyst ◽  
Metal Free ◽  
Borrowing Hydrogen ◽  
Activation Of Alcohols ◽  
Catalyst Systems ◽  
Hydrogen Reactions

Herein, we report aza-aromatics based organic mediators as a readily accessible alternative to the traditional approach of using transition metal catalyst systems for the activation of alcohols in borrowing hydrogen reactions.

Ring-opening reactions of donor–acceptor cyclopropanes with cyclic ketals and thiol ketals

2020 ◽  
Vol 18 (33) ◽  
pp. 6492-6496 ◽  
Author(s):  
Dongxin Zhang ◽  
Lei Yin ◽  
Junchao Zhong ◽  
Qihang Cheng ◽  
Hu Cai ◽  
...  
Keyword(s):  
Ring Opening ◽  
Ring Opening Reactions ◽  
Donor Acceptor

Cyclic (thiol) ketals were used as hetero-nucleophiles for the ring opening of donor–acceptor cyclopropanes to afford functionalized diethers.

Sign in / Sign up

Export Citation Format

Share Document