نتایج جستجو برای: hammett constant
تعداد نتایج: 218513 فیلتر نتایج به سال:
1 in multiple regions of human visual cortex revealed by multivariate pattern 2 classification analysis 3 4 5 Stephen T Hammett 6 Andrew T Smith 7 Matthew B Wall 8 Jonas Larsson 9 10 11 Dept of Psychology, 12 Royal Holloway University of London, 13 Surrey TW20 0EX UK. 14 15 16 Running Head: Motion and luminance encoding in human visual cortex 17 18 19 20 21 22 Corresponding author: Steve Hammet...
in order to find the susceptibility of the claisen rearrangement and next proton shift reaction of ally) aryl etherto the substiment effects in pan position, the kinetic and the:rmodynamie parameters are calculated at the33 ltp level using 6-3110. b asis set. the calculated activation energies for the rearrangements and protonshift reactions are around 3133 kcaumol and 52.16 kcal/mol, nap.. liv...
Second-order rate constants (kN) have been measured spectrophotometrically for the nucleophilic displacement reactions of 4-nitrophenyl X-substituted-cinnamates (4a-4e) and Y-substituted-phenyl cinnamates (5a-5e) with Z-substituted-phenoxide anions in 80 mol % H2O/20 mol % DMSO at 25.0 ± 0.1 C. The Hammett plot for the reactions of 4a-4e with 4-chlorophenoxide (4-ClPhO) consists of two intersec...
0040-4039/$ see front matter 2011 Elsevier Ltd. A doi:10.1016/j.tetlet.2011.11.097 ⇑ Corresponding author. Tel.: +381 11 3336738; fax E-mail address: [email protected] (B.J. Draku Rate constants for the esterification of eleven 2-[(carboxymethyl)sulfanyl]-4-oxo-4-arylbutanoic acids with diphenyldiazomethane in ethanol at 30 C were determined, and correlated with substituent constants using...
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