A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Recommanded Product: 4,4-Dimethylpiperidine-2,6-dione, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1123-40-6, Name is 4,4-Dimethylpiperidine-2,6-dione, molecular formula is C7H11NO2. In a Article, authors is Svaan, Morten£¬once mentioned of 1123-40-6
Temperature Effects on Electrode Processes. III. Electronic and Steric Effects on the Entropy of Formation of Nitrobenzene Anion Radicals
The effect of multiple substitution and alkyl substituents on the reversible electrode potentials was determined for the reduction of nitrobenzenes in acetonitrile.The entropy of formation of the anion radicals was observed to be influenced both by steric and electronic effects of the alkyl substituents.The effect of multiple substitution was observed to be dependent upon substitution pattern.The entropies of formation of the anion radicals of dinitrobenzenes were observed to be -7.8 (1,3), -5.3 (1,2) and -5.1 (1,4) as compared to -11.7 cal/K mol for the formation of nitrobenzene anion radical.Mono-, di- and trinitromesitylene anion radical formations were observed to be accompanied by entropy changes of -15.1, -11.0 and -6.8 cal/K mol.The larger entropy values due to steric interactions are further demonstrated by the series, 2,5-dimethyl (-13.0), 2,4,6-trimethyl (-15.1), 2,4,6-triethyl (-19.9), 2,4,6-tri-isopropyl (-21.7) and 2,4,6-tri-tert-butyl (-18.6).The steric effect is explained by the decrease in charge delocalization as the nitro groups are forced out of the planes of the benzene rings by the interactions with the ortho substituents.Entropy changes and enthalpy changes are correlated with molar extinction coefficients.
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Reference£º
Piperidine – Wikipedia,
Piperidine | C5H6540N – PubChem