Study of the conformational dependence of 13c chemical shifts of cycloalkanes using regression analysis method
Joint Authors
al-Hyali, Imad A. S.
al-Abbadi, Fayiz M. A.
Source
Issue
Vol. 2, Issue 1 (30 Jun. 2007), pp.21-44, 24 p.
Publisher
Yarmouk University Deanship of Research and Graduate Studies
Publication Date
2007-06-30
Country of Publication
Jordan
No. of Pages
24
Main Subjects
Topics
Abstract EN
The effect of spatial arrangement on carbon-13 (13C) chemical shifts of cycloalkanes has been investigated.
The parameters used for calculating the 13C chemical shifts are based on two principles.
The p-character which is represented by the number of primary, secondary and tertiary carbons at α-position, and the steric effect of the alkyl groups and hydrogen in different location which induce proton interactions between the considered carbon and the other carbons of the molecule at α, β, γ, .
., etc.
positions.
General and individual sets of coefficients for cyclohexanes, cis- and trans-decalin, and for structural isomers of perhydrophenanthrene (PHP) and perhydroanthracene (PHA) have been derived.
The values of the coefficients of the parameters are obtained by employing linear regression analysis method.
The predicted chemical shifts by using the general sets of coefficients gave higher deviation from the empirical values.
The parameters are proved to be sensitive to change in spatial arrangement since 13C chemical shifts of multiple rings compounds can be calculated from the regression analysis results of monocyclic compounds and vice versa, and deviations are noticed only in positions that discriminate the conformation of a specific compound and / or involved in large steric interactions.
Carbon-13 chemical shifts have been calculated for a number of hypothetical compounds, which may exist (or compounds of like structure) in coal, oil and natural products.
The spectrum of these compounds has been plotted theoretically.
American Psychological Association (APA)
al-Hyali, Imad A. S.& al-Abbadi, Fayiz M. A.. 2007. Study of the conformational dependence of 13c chemical shifts of cycloalkanes using regression analysis method. Jordan Journal of Chemistry،Vol. 2, no. 1, pp.21-44.
https://search.emarefa.net/detail/BIM-276927
Modern Language Association (MLA)
al-Hyali, Imad A. S.& al-Abbadi, Fayiz M. A.. Study of the conformational dependence of 13c chemical shifts of cycloalkanes using regression analysis method. Jordan Journal of Chemistry Vol. 2, no. 1 (Jun. 2007), pp.21-44.
https://search.emarefa.net/detail/BIM-276927
American Medical Association (AMA)
al-Hyali, Imad A. S.& al-Abbadi, Fayiz M. A.. Study of the conformational dependence of 13c chemical shifts of cycloalkanes using regression analysis method. Jordan Journal of Chemistry. 2007. Vol. 2, no. 1, pp.21-44.
https://search.emarefa.net/detail/BIM-276927
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 44
Record ID
BIM-276927