Use Of Correlation Spectroscopy Research Articles

Synthesis and NMR study of cyclohexylphosphonates

Cyclohexyl-, 2-chlorocyclohex-1-yl and cyclohexen-1-ylphosphonic acids chlorides and fluorides were synthesized and studied by the 1H, 13C, 19F, and 31P NMR methods with the use of correlation spectroscopy and quantum-chemical calculations.

Two-Dimensional Nuclear Magnetic Resonance Spectra of Cellulose and Cellulose Triacetate

An attempt was made to give a full assignment, using only NMR information, to all peaks in 1H and 13C NMR spectra for systems of cellulose in 2.5 N NaOD/D2O and of cellulose triacetate (CTA, total degree of substitution 2.92) in deuterated trichloromethane (TCM-d), and in deuterated dimethylsulfoxide (DMSO-d6). For this purpose two-dimensional (2D) homonuclear 1H shift correlation spectroscopy (COSY), heteronuclear 1H–13C shift correlation spectroscopy (C–H COSY), and long-range heteronuclear 1H–13C shift correlation spectroscopy (long-range C–H COSY) were applied to the above systems. By COSY 1H peaks of cellulose/aq. alkali solution were assigned, from lower magnetic field, to H1, H6, H6′, (H3+ H4+ H5), and H2 protons, respectively. Here, two unequivalent H6 peaks heavily overlapped in the one-dimensional spectrum were observed very separately in 2D spectrum. By C–H COSY 13C peaks of cellulose were assigned, from lower magnetic field, to C1, (C3, C4, C5), C2, and C6 carbons, respectively. C3, C4, and C5 carbon peaks were unable to be assigned separately, due to mutual and heavy overlapping of H3, H4, and H5 peaks. For cellulose triacetate, through use of COSY and C–H COSY all peaks in the region of glucopyranose backbone in 1H and 13C NMR wre able to be successfully and completely assigned. Long-range C–H COSY confirmed definitely the existence of the close correlationships between acetyl methyl proton and carbonyl carbon at the different carbon positions of CTA, which showed again the validity of the previous assignment with respect to carbonyl carbons (i.e., C6, C3, and C2 carbons from lower magnetic field).

Host recognition in parasitic angiosperms: use of correlation spectroscopy to identify long-range coupling in an haustorial inducer

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHost recognition in parasitic angiosperms: use of correlation spectroscopy to identify long-range coupling in an haustorial inducerJohn C. Steffens, James L. Roark, David G. Lynn, and James L. RiopelCite this: J. Am. Chem. Soc. 1983, 105, 6, 1669–1671Publication Date (Print):March 1, 1983Publication History Published online1 May 2002Published inissue 1 March 1983https://doi.org/10.1021/ja00344a052RIGHTS & PERMISSIONSArticle Views66Altmetric-Citations23LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (392 KB) Get e-Alerts Get e-Alerts