Topic
Substituent
About: Substituent is a research topic. Over the lifetime, 42877 publications have been published within this topic receiving 516716 citations. The topic is also known as: side chain & side group.
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TL;DR: Experimental results are reported showing that the photocatalytic oxidation of aromatic compounds containing an electron-donor group (EDG) gives rise mainly to ortho- and para-monohydroxy derivatives while in the presence of a electron-withdrawing group (EWG) all the monhydroxy derivatives are obtained.
78 citations
TL;DR: In this article, a series of novel 4-acetyl-5-methyl-1,2,3-triazole exclusively with 1-4 regioisomers were synthesized via 1-3-dipolar cycloaddition with high yield from azide and acetyl acetone in the presence of a base, under warm condition in ethanol in a short duration.
78 citations
TL;DR: In this paper, the effect of aromatic hydroxy and methoxy substituents on both the rate and product selectivity for pyrolysis of these more complex lignin model compounds was explored.
Abstract: The dominant structural linkage in the abundant renewable energy resource, lignin, is the arylglycerol-β-aryl ether commonly referred to as the β-O-4 linkage. The simplest representation of this linkage, unadorned by substituents, is phenethyl phenyl ether (PhCH2CH2OPh; PPE). Our prior detailed kinetic studies of the pyrolysis of PPE at 330–425 °C showed that a free-radical chain mechanism is involved that cycles through radicals formed at both the α- and β-carbons. The previously unrecognized competing path involving rearrangement of the β-carbon radical by an O,C-phenyl shift accounts for ca. 25% of the products. In this paper, we explore the effect of aromatic hydroxy and methoxy substituents on both the rate and product selectivity for the pyrolysis of these more complex lignin model compounds. The pyrolysis reactions are conducted in biphenyl solvent at 345 °C and low conversions to minimize secondary reactions. The pyrolysis rates were found to vary substantially as a function of the substitution pa...
78 citations
TL;DR: Getting the green light!
Abstract: Getting the green light! Substituted arylazopyrazoles (AAPs) have been investigated as supramolecular photoswitches in aqueous solution. Selective photostationary states (PSSs) and improved binding affinities to β-cyclodextrin have been determined. The experimental findings are supported by results from DFT calculations.
78 citations
78 citations