Hydroboration of internal alkynes catalyzed by FeH(CO)(NO)(PPh3)2: a case of boron-source controlled regioselectivity

2020 ◽  
Vol 10 (5) ◽  
pp. 1492-1497 ◽  
Author(s):  
Fabian Rami ◽  
Franziska Bächtle ◽  
Bernd Plietker
Keyword(s):  
Internal Alkynes ◽  
Boron Source

The Fe–H complex FeH(CO)(NO)(Ph3P)2 catalyzes the stereoselective, regiodivergent hydroboration of internal alkynes using either pinacolborane (HBpin) or bis(pinacolato)diboron (B2pin2) as a boron source.

Diastereoselective Reductive Arylation of Internal Alkynes

Synfacts ◽  
2018 ◽  
Vol 14 (09) ◽  
pp. 0955
Keyword(s):  
Internal Alkynes

Ruthenium(II)-Catalyzed Intermolecular Cyclo(co)trimerization of 3-Halopropiolamides with Internal Alkynes

2018 ◽  
Author(s):  
Anthony P. Silvestri ◽  
James S. Oakdale
Keyword(s):  
Ambient Temperature ◽  
Internal Alkynes

<div>A highly chemo- and regioselective cyclo(co)trimerization between 3-halopropiolamides and symmetrical internal alkynes is reported. The reaction is catalyzed by Ru(II)-complexes and proceeds at ambient temperature in ethanol to deliver fully substituted dihalogenated isophthalamides. 1,4-Butynediol was found to undergo spontaneous lactonization with halopropiolamides after trimerization to provide 5,7-dihalo-phthalide products.</div>

Intermolecular [5+2] Annulation between 1‐Indanones and Internal Alkynes by Rh‐catalyzed C−C Activation

2021 ◽  
Author(s):  
Rui Zhang ◽  
Ying Xia ◽  
Guangbin Dong
Keyword(s):  
Internal Alkynes

Rhodium-Catalyzed, Phosphorus(III)-Directed Hydroarylation of Internal Alkynes: Facile and Efficient Access to New Phosphine Ligands

Synlett ◽  
2020 ◽  
Author(s):  
Minyan Wang ◽  
Zhuangzhi Shi ◽  
Huanhuan Luo ◽  
Dawei Wang
Keyword(s):  
High Selectivity ◽  
Enantiomeric Excess ◽  
Phosphine Ligands ◽  
Rapid Construction ◽  
Efficient Access ◽  
Internal Alkynes ◽  
Great Progress ◽  
Chiral Phosphine Ligands ◽  
Optimized Conditions ◽  
Made In

AbstractOrganophosphines are an important class of ligands widely used in organic chemistry. Although great progress has recently been made in the rapid construction of new phosphines through Rh- or Ru-catalyzed C–H bond functionalizations, synthetic access to more diverse phosphines remains a challenge. We describe an efficient process for the rhodium-catalyzed phosphorus(III)-directed hydroarylation of internal alkynes to generate various alkenylated and 2′,6′-dialkenylated biarylphosphines with high selectivity. A range of diverse alkynes and phosphines were effectively prepared with broad functional-group compatibility under the optimized conditions. In addition, the developed protocol can be extended to modify chiral phosphine ligands, providing enantioenriched alkenylated phosphines without erosion of the enantiomeric excess.

Preparation, Structure and Thermolysis Characteristics of Ammonia Borane

2016 ◽  
Vol 680 ◽  
pp. 529-533
Author(s):  
Jian Li Ma ◽  
Hai Yan Cao ◽  
Xiao Xia Zhang ◽  
Dong Chen
Keyword(s):  
Boric Acid ◽  
Storage System ◽  
Ammonia Borane ◽  
Mass Ratio ◽  
Hydrogen Storage System ◽  
Ammonia Complex ◽  
Ft Ir ◽  
Ammonia Source ◽  
Boron Source ◽  
Amino Complex

Ammonia borane (NH3BH3, AB) is an excellent source of hydrogen(19.6 wt %) for fuel cell applications. In this paper, pure ammonia borane is successfully prepared by using amino complex for ammonia complex Ag(NH3)2Cl as new ammonia source, and sodium borohydride (NaBH4) as boron source. The composition and constitution of the products are measured by XRD and FT-IR. The thermolysis of ammonia borane is significant for its practical application. Boric acid plays a role in improving ammonia borane hydrogen performance. The effects of different mass ratio of boric acid and ammonia borane on dehydrogenation are tested by XRD, TG/DTA and TPD-MS. The results show that boric acid can decrease the first level dehydrogenation temperature of ammonia borane decrease to about 85°C (working temperature of PEMFC). What’s more, the onset temperature of AB’s thermolysis can decrease to about 60°C when the mass ratio of ammonia borane and boric acid is equal to 3:1. This makes ammonia borane be more suitable for the application in on-board hydrogen storage system.

Organocatalytic trans Phosphinoboration of Internal Alkynes

2020 ◽  
Vol 132 (34) ◽  
pp. 14464-14468
Author(s):  
Russell G. Fritzemeier ◽  
Jan Nekvinda ◽  
Christopher M. Vogels ◽  
Carol Ann Rosenblum ◽  
Carla Slebodnick ◽  
...  
Keyword(s):  
Internal Alkynes

scholarly journals Rhenium-Catalyzed Regioselective ortho-Alkenylation and [3 + 2 + 1] Cycloaddition of Phenols with Internal Alkynes

2019 ◽  
Vol 21 (9) ◽  
pp. 3441-3445 ◽  
Author(s):  
Masahito Murai ◽  
Masaki Yamamoto ◽  
Kazuhiko Takai
Keyword(s):  
Internal Alkynes

ChemInform Abstract: Synthesis of Internal Alkynes via One-Pot Palladium-Catalyzed and Dehydrobromination Reactions of 1,1-Dibromo-1-alkenes.

ChemInform ◽  
2009 ◽  
Vol 40 (10) ◽  
Author(s):  
Giorgio Chelucci ◽  
Francesca Capitta ◽  
Salvatore Baldino
Keyword(s):  
One Pot ◽  
Internal Alkynes ◽  
Palladium Catalyzed

scholarly journals Cp*CoIIICatalyzed Site-Selective CH Activation of UnsymmetricalO-Acyl Oximes: Synthesis of Multisubstituted Isoquinolines from Terminal and Internal Alkynes

2015 ◽  
Vol 54 (44) ◽  
pp. 12968-12972 ◽  
Author(s):  
Bo Sun ◽  
Tatsuhiko Yoshino ◽  
Motomu Kanai ◽  
Shigeki Matsunaga
Keyword(s):  
Internal Alkynes ◽  
Site Selective

Gold-Catalyzed Intermolecular Hydrophenoxylation of Unactivated Internal Alkynes

2010 ◽  
Vol 75 (7) ◽  
pp. 2247-2258 ◽  
Author(s):  
Malleswara Rao Kuram ◽  
M. Bhanuchandra ◽  
Akhila K. Sahoo
Keyword(s):  
Internal Alkynes
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