نتایج جستجو برای: hammett plot
تعداد نتایج: 31247 فیلتر نتایج به سال:
Relationship between electrophilicity index, Hammett constant and nucleus-independent chemical shift
Abstract. The meta-plot is a descriptive visual tool for meta-analysis that provides information on the primary studies in and results of meta-analysis. More precisely, portrays (1) precision statistical power meta-analysis, (2) estimate confidence interval random-effects (3) cumulative yielding robustness check meta-analytic effect size with respect to studies’ precision, (4) evidence publicat...
The pKAH-values of some substituted phenylacetic acid derivatives have been determined in the system water /dimethyl sulphoxide / 0. 11 M tetramethylammonium hydroxide. The acidity depends strongly on the polarity of the substituent in the phenyl group, Hammett p-valucs from 4.8 to 5 .8, and in the case of the same s<1bstituent decreasf's in the order nit! ik, terr-butyl ester, dimethylami<'e e...
Iridium catalyzed primary alcohol oxidation triggers reductive C-O bond cleavage of isoprene oxide to form aldehyde-allyliridium pairs that combine to form products of tert-(hydroxy)-prenylation, a motif found in >2000 terpenoid natural products. Curtin-Hammett effects are exploited to enforce high levels of anti-diastereo- and enantioselectivity in the formation of an all-carbon quaternary cen...
The [Cp*IrCl(2)](2)-catalysed alkylation of amines with alcohols was investigated using a combination of experimental and theoretical methods. A Hammett study involving a series of para-substituted benzyl alcohols resulted in a line with a negative slope. This clearly documents that a positive charge is built up in the transition state, which in combination with the measurement of a significant...
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