نتایج جستجو برای: hammett plot

تعداد نتایج: 31247  

Journal: :British Dental Journal 2012

Journal: :Journal of Family Planning and Reproductive Health Care 2012

Journal: :Zeitschrift Fur Psychologie-journal of Psychology 2023

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...

Journal: :Nature 2005

Journal: :International Letters of Chemistry, Physics and Astronomy 2014

2015
K. Zaharieva J. N. Stefanovsky I. G. Pojarlieff

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...

2014
Jiajie Feng Victoria J. Garza Michael J. Krische

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...

Journal: :Organic & biomolecular chemistry 2012
Peter Fristrup Matyas Tursky Robert Madsen

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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