Carboxylation of terminal alkynes promoted by silver carbamate at ambient pressure

2019 ◽  
Vol 43 (27) ◽  
pp. 10821-10825 ◽  
Author(s):  
Giulio Bresciani ◽  
Fabio Marchetti ◽  
Guido Pampaloni

Simple and easily available silver and copper carbamates were investigated as catalysts for the carboxylation of terminal alkynes. Ag(O2CNMe2), combined with Cs2CO3, afforded propiolic acids at ambient CO2 pressure in satisfying yields.

2017 ◽  
Vol 19 (9) ◽  
pp. 2080-2085 ◽  
Author(s):  
Zhilian Wu ◽  
Lei Sun ◽  
Qinggang Liu ◽  
Xiaofeng Yang ◽  
Xue Ye ◽  
...  

A Schiff base-modified silver catalyst was developed for the direct carboxylation of terminal alkynes with CO2, enabling the efficient synthesis of valuable alkynyl carboxylic acids.


2015 ◽  
Vol 17 (7) ◽  
pp. 4061-4067 ◽  
Author(s):  
Jia-Ning Xie ◽  
Bing Yu ◽  
Chun-Xiang Guo ◽  
Liang-Nian He

A tandem carboxylation/annulation sequence promoted by a copper(i)/phosphine catalytic system was developed with simultaneous formation of four novel bonds i.e. two C–C bonds and two C–O bonds in a one-pot stepwise manner.


2015 ◽  
Vol 17 (3) ◽  
pp. 1675-1682 ◽  
Author(s):  
Hao Cheng ◽  
Bei Zhao ◽  
Yingming Yao ◽  
Chengrong Lu

Three novel bis(amidate) rare-earth metal amides were prepared and characterized. Treatment of CO2 with terminal alkynes obtained propiolic acids in high to excellent yields using the highest reactive Nd-based catalyst at ambient pressure.


Author(s):  
Sudeep M. Rao ◽  
Joshua Samuel ◽  
Sai S. Prakash ◽  
C. Jeffrey Brinker

Ambient pressure silica aerogel thin films have recently been prepared by exploiting reversible drying shrinkage caused by derivatization of the internal gel surface. Aerogels have porosities of upto 99.9% and due to the small size of the pores (few nanometers), large capillary stresses are produced in gels that are partially saturated with a wetting liquid. As a result of these capillary stresses, the flexible silica network undergoes strain which has been observed using environmental microscopy. This technique allows variation of the equilibrium vapor pressure and temperature, and a simultaneous monitoring of the deformation of the unconstrained film thickness. We have observed >600% deformation during the pore-filling and pore-emptying cycles. In this presentation, we discuss the unique stress-strain behavior of these films.Ref.: Sai S. Prakash, C. Jeffrey Brinker, Alan J. Hurd & Sudeep M. Rao, "Silica aerogel films prepared at ambient pressure by using surface derivatization to induce reversible drying shrinkage", Nature. Vol. 374, 30 March, 1995, 439-443.


1983 ◽  
Vol 44 (C3) ◽  
pp. C3-1001-C3-1005
Author(s):  
S. Iwabuchi ◽  
H. Fukuyama

2009 ◽  
Vol 19 (11) ◽  
pp. 997-1012 ◽  
Author(s):  
Jochen Stratmann ◽  
D. Martin ◽  
P. Unterlechner ◽  
R. Kneer

1995 ◽  
Author(s):  
Chan-Hong Chung ◽  
Kenneth D ◽  
Robert Stubbs
Keyword(s):  

Sign in / Sign up

Export Citation Format

Share Document