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In organic chemistry, regioselectivity is the preference of chemical bonding or breaking in one direction over all other possible directions. [1] [2] It can often apply to which of many possible positions a reagent will affect, such as which proton a strong base will abstract from an organic molecule, or where on a substituted benzene ring a further substituent will be added.
Rhythmanalysis: Space, Time and Everyday Life is a collection of essays by Marxist sociologist and urbanist philosopher Henri Lefebvre.The book outlines a method for analyzing the rhythms of urban spaces and the effects of those rhythms on the inhabitants of those spaces.
Chemoselectivity is the preferential reaction of a chemical reagent with one of two or more different functional groups. [1]In a chemoselective system, a reagent in the presence of an aldehyde and an ester would mostly target the aldehyde, even if it has the option to react with the ester.
One example of this is a study conducted by D. Fattori looking at the regioselectivity of the Demjanov rearrangement in one-carbon enlargements of naked sugars. It showed that when an exo methylamine underwent Demjanov nitrous acid deamination, ring enlargement was not produced.
The Practice of Everyday Life begins by pointing out that while social science possesses the ability to study the traditions, language, symbols, art and articles of exchange that make up a culture, it lacks a formal means by which to examine the ways in which people reappropriate them in everyday situations.
The Psychopathology of Everyday Life. Everyday life is a key concept in cultural studies and is a specialized subject in the field of sociology.Some argue that, motivated by capitalism and industrialism's degrading effects on human existence and perception, writers and artists of the 19th century turned more towards self-reflection and the portrayal of everyday life represented in their ...
Selectivity also provides some immunity to blanketing interference. LC circuits are often used as filters; the Q ("Quality" factor) determines the bandwidth of each LC tuned circuit in the radio. The L/C ratio, in turn, determines their Q and so their selectivity, because the rest of the circuit - the aerial or amplifier feeding the tuned ...
Selection in schools, the admission of students on the basis of selective criteria; Selection effect, a distortion of data arising from the way that the data are collected; A selection, or choice function, a function that selects an element from a set