substituent

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substituent

[səb′stich·ə·wənt]
(organic chemistry)
An atom or functional group substituted for another in a chemical structure.
References in periodicals archive ?
TEMPO-substituted b-keto esters containing sterically different substituents subjected to the tan-dem reaction afford the corresponding in-dole-containing tertiary alcohol in good to excellent yields (compounds 26~29, 31) under optimized con-ditions.
Nevertheless, present study showed that the cavity of bCD can bind the viologen substituent in non-aqueous medium and permits thermodynamic and kinetics study.
These polymers were categorized into four birefringence-types, even though their molecular structures differ only by the substituents on the side chains.
The results in the table indicate that the best resolution of the racemates is attained by the phenylcarbamate derivatives with either alkyl or halogen substituents at the 4-position, and that the simple phenylcarbamate and the two derivatives bearing polar substituents, methoxy and nitro groups, are not the best derivatives.
We consider that the orientations adopted by the substituent and the pyrogallol ring with respect to such bond is likely to determine the geometry of the final product.
However, there are only a handful of synthetic schemes and substituents commonly used.
Fluorination of these heteroaromatic ring systems can produce profound changes in activity and is the reason that many drugs on the market today contain fluorine substituents.
Taking these factors into consideration, we have designed a series of triazole-centred ligands, flanked by adenine and pyrimidine residues and we studied three conformations (one opened and two closed conformations) of the new class of nucleoside with various substituents (X = H, C[H.
Strategic considerations for economizing reagents are discussed in the introduction; in particular, the question of whether to install substituents before or after cyclization is highlighted.
2,6-diethyl-1,3,5,7-tetramethyl substituted BODIPY derivatives with methyl, propyl, pentyl and decyl substituents at the meso position have been reported (Nagi et al.
Isomers of these compounds are distinguished by the number and arrangement of methyl substituents attached to the chromanol ring.
the molar volume and molar refractivity) calculated [27], these options are useful tool for correlation of different properties which depend on characteristics of substituents attached to a constant reaction center.