33090-16-3Relevant academic research and scientific papers
Thermal Decomposition of Pentacarbonyl(1-acyloxyalkylidene)chromium(0) Complexes: Formation of Z-Enol Esters
S?derberg, Bj?rn C.,Liu, Jian,Ball, Thomas W.,Turbeville, Michael J.
, p. 5945 - 5952 (1997)
Pentacarbonyl(1-acyloxyalkylidene)chromium(0) complexes, formed in situ by reaction of the corresponding tetramethylammonium pentacarbonyl(1-oxoalkyl)chromate(1-) salts with carboxylic acid halides, affords enol esters in moderate to good yields. In all cases examined, the Z-enol ester was obtained as the major or exclusive isomer. Addition of 1 equiv of pyridine to the reaction mixture substantially improved the Z/E ratio and, in most cases, increased the chemical yield.
On the mechanism of the copper-catalyzed cyclopropanation reaction
Rasmussen, Torben,Jensen, Jakob F.,stergaard, Niels,Tanner, David,Ziegler, Tom,Norrby, Per-Ola
, p. 177 - 184 (2007/10/03)
The selectivity-determining step in enantioselective copper-catalyzed cyclopropanation with diazo compounds has been studied by experimental and computational methods. The addition of the very reactive metallacarbene intermediate in an early transition st
