Kinetics of the reaction of (4-nitrophenyl)nitromethane with tetramethylguanidine in toluene
作者:E. F. Caldin、S. Mateo、P. Warrick
DOI:10.1021/ja00391a044
日期:1981.1
The proton and deuteron transfer reactions of (4-nitrophenyl)-nitromethane and tetramethylguanidine were reported in the past to have a high isotopic rate ratio of 45 in toluene. This was found to be due to residual water. Isotopic-exchange was found not to be kinetically important. (DLC)
Pruszynski, Przemyslaw, Canadian Journal of Chemistry, 1987, vol. 65, p. 2160 - 2163
作者:Pruszynski, Przemyslaw
DOI:——
日期:——
Thermodynamic parameters for the reaction of 1,8-diazabicyclo [5.4.0] undec-7-ene with 4-nitrophenylnitromethane in several aprotic solvents
作者:Naja A. Ellis、Colin D. Hubbard
DOI:10.1007/bf00647205
日期:1993.4
Equilibrium constants K for reaction of the C-acid, 4-nitro/phenylnitromethane with 1,8-diazabicyclo [5.4.0] undec-7-ene have been determined in aprotic solvents over a range of temperature. Corresponding measurements have been made for the deuterated acid 4-NPNM-d2. Thermodynamic parameters K, DELTAH-degrees and DELTAS-degrees, for proton and for deuteron transfers are not very different in a given solvent, but show a considerable solvent dependence. There is an increase in magnitude of K with increase in solvent dielectric constant, a finding which is consistent with formation of an ion-pair. The range of extent of exothermicity of the reaction is quite small, -40 to -65 kJ-mol-1', and the values of DELTAS-degrees (large, negative) indicate, in general, increasing solvent restriction by the product with increasing solvent polarity. A modest bathochromic solvatochromism of the product is observed as the dielectric constant increases.