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 ?
Table 1 clearly shows that the number of possible reaction paths which produce intermediate compounds containing three TPG substituents is low: this occurs in only 16 of the 97 possible reaction paths for all four cases.
6) is prevented by a changed cure system, which will be described later, and by the polymeric substituents on the Si-unit.
Photochemistry of substituted benzyl acetates and benryl pivalates: a reinvestigation of substituent effects.
Often, one of the benzene's six carbons already hosts a "substituent" that governs further substitutions by biasing where on the ring an electron will be available for bonding.
To explore the effects of substituents on the energetics of the reactions, a series of reactions involving electron-withdrawing and electron-donating groups and ring substituents on the olefin were studied and the energetics are reported in Tables 1 and 2.
The influence of substituents on the -R position of orthoesters upon results of the reaction was investigated.
The UV spectral correlation analysis of substituted (E)-1-benzylidene-2-(3 nitrophenyl)hydrazine compounds reveals that all the substituents have shown poor correlations (r < 0.900) [34-39] with Hammett substituent constants namely [sigma], [[sigma].sup.+], [[sigma].sub.I], [[sigma].sub.R] and Swain-Lupton's F and R parameters [40].
Hypothesis: The reaction conducted on benzaldehydes with electron-withdrawing substituents should result in a less pronounced shift towards the products of the secondary and tertiary Leuckart reactions.
The composition of PN-F and its properties can be quite variable as a consequence of changes in the ratio of the two main substituents and the length of the telomer fluoroalkoxide groups.
Among the topics are computational approaches in agricultural research, the unique role of halogen substituents in designing crop protection compounds, new targets for fungicides, ecological modeling in pesticide risk assessment, and an enquiry-led approach to generating data for the safety evaluation of new pesticide active ingredients.