192935-61-8Relevant academic research and scientific papers
N-pyrrolyl phosphines: Enhanced π-acceptor character via carboalkoxy substitution
Huang, Adrian,Marcone, John E.,Mason, Kate L.,Marshall, William J.,Moloy, Kenneth G.,Serron, Scafford,Nolan, Steven P.
, p. 3377 - 3380 (1997)
A series of 3,4-dicarboethoxy-N-pyrrolyl phosphine ligands (R2P-NC4H2(CO2Et)2) is described. A number of techniques, including reaction calorimetry, infrared spectroscopy, and X-ray crystallography, demonstrate that these ligands are potent π-acceptors and that the electronic substituent parameter χi for the 3,4-(EtO2C)2C4H2N moiety is ca. 16, placing it in a position between fluorine and chlorine.
