The proton signal of the O=C–H group in ortho‐substituted benzaldehydes shows a coupling with a ring proton. The analysis of the spectra of 2,4‐dichlorobenzaldehyde, 2,4‐dimethoxybenzaldehyde, and 2,4‐dihydroxybenzaldehyde shows that the observed splitting is due to a coupling with a ri...
A complete analysis of the high resolution proton magnetic resonance spectra of monosubstituted benzaldehydes has been performed as an ABCDE spin system. The chemical shifts and the coupling constants are determined in six compounds with great accuracy. By using the additivity rule the calculated ...
ChemInform Abstract: SYNTHESIS AND NMR SPECTRA OF 2,6‐ AND 2,4‐DIARYL‐3,7‐DIOXABICYCLO(3.3.0)OCTANESother natural productsTrans-3,4-dibenzyl-2-oxo-tetrahydrofuran (6) a substituted tetrahydrofuranoid lignan was synthesized in 70% yield via the Stobbe condensation between (1) benzaldehyde ...
Thirteen biphenyl analogues of α-cyanochalcones were prepared by condensation of -phenylbenzoylacetonitrile () with -substituted benzaldehydes. Their C NMR chemical shifts were measured and correlated with the Hammett parameters (σ, σ) and the Swain-Lupton reactivity parameters. A consistent picture...
ChemInform Abstract: OXYGEN-17 NMR STUDIES OF SUBSTITUENT AND HYDROGEN-BONDING EFFECTS IN SUBSTITUTED ACETOPHENONES AND BENZALDEHYDES T.,E.,ST.,... - 《Chemischer Informationsdienst》 被引量: 57发表: 1981年 13C nuclear magnetic resonance studies on acetophenones: Barriers to internal rotation ...
In this chapter [7], we show the 17O NMR spectra of polyglycine form I (PG I: β-sheet structure), polyglycine form II (PG II: 31-helix structure), glycylglycine (GlyGly) and glycylglycine nitrate (GlyGl y?HNO3) in the solid state, which cover a wide range of hydrogen bond ...
13C NMR Study of Annular Tautomerism of Azoles in the Solid State The reaction of 3-aminopropionamide oxime (7) with two equiv. of benzaldehyde or of a substituted benzaldehyde gives cis-3,5-diaryl-5,6,7,8-tetrahydro-3H[1... Faure,Robert,Vincent,... - 《Heterocycles》 被引量: 34发表...
cyclic 2-aryl-1,3-dithianes were previously studied, the objective of this thesis was to study whether the scope of the oxidation reaction could be extended to acyclic lithiated benzaldehyde dithioacetals and 2-alkyl-1,3-dithianes. ... T Rimpiläinen 被引量: 0发表: 2018年 ...
NMR spectra were recorded at 298 K using 300, 500, or 600 MHz spectrometers (13C{1H} NMR frequencies of 75.5, 126, or 151 MHz, respectively). Adopting the previously reported strategy,2 standard solutions of mixtures of specific impurities were used to reduce the number of necessary ...
253. ONE-BOND CARBON-13-CARBON-13 NMR COUPLING CONSTANTS S IN SUBSTITUTED ACETOPHENONES AND BENZALDEHYDES AND THE... 253. ONE-BOND CARBON-13-CARBON-13 NMR COUPLING CONSTANTS S IN SUBSTITUTED ACETOPHENONES AND BENZALDEHYDES AND THEIR O-PROTONATED CARBOXONIUM IONS... V.,V.,KRISHNAMURTHY,.....