Relevant bibliographies by topics / Erythro/threo configuration analysis

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Academic literature on the topic 'Erythro/threo configuration analysis'

Author: Grafiati
Published: 10 September 2021
Last updated: 29 July 2025

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Journal articles on the topic "Erythro/threo configuration analysis"

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Rudiyansyah, Rudiyansyah, Lynette K. Lambert, and Mary J. Garson. "CONFORMATIONAL STUDIES OF LIGNANS FROM Durio oxleyanus Griff. ()." Indonesian Journal of Chemistry 10, no. 1 (2010): 116–21. http://dx.doi.org/10.22146/ijc.21490.

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Searching for secondary metabolites from the wood bark of Durio oxleyanus has afforded two new lignans, namely threo-carolignan Y (1) and erythro-carolignan Y (2) together with three other known lignans erythro-carolignan X (3), boehmenan X (4) and boehmenan (5). The relative configurations of compounds 1 and 2 were established by J-based configurational analysis and 2D NOESY studies. Keywords: carolignan, threo, erythro, Durio, Bombacaceae
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Wang, Yi, Peer Kirsch, Tomas Lebl, Alexandra M. Z. Slawin, and David O'Hagan. "The preferred conformation of erythro- and threo-1,2-difluorocyclododecanes." Beilstein Journal of Organic Chemistry 8 (August 10, 2012): 1271–78. http://dx.doi.org/10.3762/bjoc.8.143.

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Cyclododecane adopts a square-like structure with corner and edge CH2 groups. In this study erythro- and threo-1,2-difluorocyclododecanes were prepared to explore whether the two vicinal C–F bonds, with different relative configurations, preferably locate at corner/edge or edge/edge locations. Conformational analysis comparing the diastereoisomers was explored by using a combination of 19F{1H} NMR spectroscopy, computational studies and, in the case of the threo isomer, X-ray structural analysis. In the lowest energy conformers for both diastereoisomers the vicinal C–F bonds are located corner
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Sugimoto, T., T. Akiyama, Y. Matsumoto та G. Meshitsuka. "The Erythro/Threo Ratio of β-O-4 Structures as an Important Structural Characteristic of Lignin. Part 2. Changes in Erythro/Threo (E/T) Ratio of β-O-4 Structures during Delignification Reactions". Holzforschung 56, № 4 (2002): 416–21. http://dx.doi.org/10.1515/hf.2002.064.

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Summary The ozonation method was applied to an analysis of the changes in erythro and threo (E/T) ratio of arylglycerol-β-aryl ether (β-O-4) structures in the residual lignins of delignified wood samples. When delignified by alkali cook, not only the total yield of erythronic and threonic acids per lignin decreased, but also the E/T ratio decreased with the progress of delignification. These results indicate that residual lignin of alkali-delignified wood contain only a small amount of arylglycerol-β-aryl ether structures and/or glycerol side chains, which are relatively rich in the threo form
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Jahan, M. Sarwar, and Sung Phil Mun. "Isolation and Characterization of Lignin from Tropical and Temperate Hardwood." Bangladesh Journal of Scientific and Industrial Research 44, no. 3 (2010): 271–80. http://dx.doi.org/10.3329/bjsir.v44i3.4399.

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Dioxane and milled wood lignins (MWL) were isolated from tropical hardwood, Nalita (Trema orientalis) and temperate hardwood, aspen. These lignins were characterized by UV, FTIR, 1H-NMR and 13C-NMR spectroscopy, alkaline nitrobenzene oxidation, molecular weight determination, elemental and methoxyl analysis. The structural analysis revealed that Nalita and aspen lignin is syringyl-guaiacyl type. Aspen lignin had higher syringyl unit than Nalita lignin. The β-O-4 type linkages are the main interunit linkages and more abundant in aspen than Nalita. Dioxane lignin showed higher free phenolic hydr
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Bedeschi, Angelo, Piera Fonte, Giovanni Fronza, Claudio Fuganti, and Stefano Serra. "The Co-identity of Lipiarmycin A3 and Tiacumicin B." Natural Product Communications 9, no. 2 (2014): 1934578X1400900. http://dx.doi.org/10.1177/1934578x1400900227.

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The co-identity of the antibiotics lipiarmycin A3 obtained from Actinoplanes deccanensis and tiacumicin B obtained from Dactylosporangium aurantiacum was unambiguously demonstrated through a number of experimental means. Spectroscopic analyses performed on both the antibiotics themselves and on their derivatives showed no difference between the two series of compounds. Moreover, unambiguous confirmation of the postulated identity of the two compounds was achieved by chemical degradation of lipiarmycin A3 and isolation of (3 S,4 R)-pentane-1,3,4-triol triacetate whose relative configuration was
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Bedeschi, Angelo, Piera Fonte, Giovanni Fronza, Claudio Fuganti, and Stefano Serra. "The Co-identity of Lipiarmycin A3 and Tiacumicin B." Natural Product Communications 11, no. 5 (2016): 1934578X1601100. http://dx.doi.org/10.1177/1934578x1601100501.

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The co-identity of the antibiotics lipiarmycin A3 obtained from Actinoplanes deccanensis and tiacumicin B obtained from Dactylosporangium aurantiacum was unambiguously demonstrated through a number of experimental means. Spectroscopic analyses performed on both the antibiotics themselves and on their derivatives showed no difference between the two series of compounds. Moreover, unambiguous confirmation of the postulated identity of the two compounds was achieved by chemical degradation of lipiarmycin A3 and isolation of (3 S,4 R)-pentane-1,3,4-triol triacetate whose relative configuration was
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7

Shen, Xinhua, та Adriaan Van Heiningen. "Synthesis of β-O-4 lignin model dimers and their chlorinated derivatives". Canadian Journal of Chemistry 70, № 6 (1992): 1754–61. http://dx.doi.org/10.1139/v92-220.

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The unknown lignin model dimers with hydroxymethyl group at the para position of the phenoxy moiety and their chlorinated derivatives (compounds 1–13, except 8) have been synthesized. During the preparation of 6 from 5, a byproduct was isolated and identified as 9. The compounds 4, 7, and 8 were obtained as a mixture of erythro and threo isomers in the ratio of about 5:4, estimated from their 13C NMR spectra, and the erythro isomer 8a was crystallized from the mixture. Chlorinated derivatives 12a (erythro) and 12b (threo) were also isolated. Their relative configuration was assigned on the bas
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8

Akiyama, Takuya, Hitoshi Goto, Deded S. Nawawi, Wasrin Syafii, Yuji Matsumoto та Gyosuke Meshitsuka. "Erythro/threo ratio of β-O-4-5 structures as an important structural characteristic of lignin. Part 4: Variation in the erythro/threo ratio in softwood and hardwood lignins and its relation to syringyl/guaiacyl ratio". Holzforschung 59, № 3 (2005): 276–81. http://dx.doi.org/10.1515/hf.2005.045.

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Abstract The proportion of erythro- and threo-forms of β-O-4-structures in lignin was elucidated by ozonation analysis of 21 wood species, and the relationship to the syringyl and guaiacyl composition was investigated. For all hardwood species, the erythro-form of β-O-4-structures predominated, although the extent varied widely, depending on wood species. In contrast, the proportion and amount of erythro- and threo-forms were very similar in all softwood species. The proportion of the erythro-form was greater in species with a higher methoxyl content in the lignin (correlation coefficient, R2=
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9

BANI, TALAPATRA, POREL ABHIJIT, BISWAS KALLOLMAY, and KUMAR TALAPATRA SUNIL. "Absolute Configurations of Goniodiol, Goniodiol Monoacetate and Other Related Dihydropyrones from Synthetic, Circular Dichroism and X-Ray Crystallographic Evidence." Journal of Indian Chemical Society Vol. 74, Nov-Dec 1997 (1997): 896–903. https://doi.org/10.5281/zenodo.5900460.

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Centre of Advanced Studies on Natural Products, Department of Chemistry, University College of Science, 92 Acharya Prafulla Chandra Road, Calcutta-700 009 <em>Manuscript received 10 September 1997</em> The absolute configuration of (+)-goniodiol [6-(7,8-dibydro-7,8-dihydroxystyryi)-5,6-dibydro-2-pyrone] (3) has been unambiguously and independently determined and revised as 7(<em>R</em>),8(<em>R</em>) from the circular dithroism (CD) studies of the diol and its dibenzoate. The 6(<em>R</em>) configuration that follows from its already reported 6,1<em>-threo</em> configuration is also confirmed b
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10

Poláková, Ivana, Miloš Buděšínský, Zdeněk Točík, and Ivan Rosenberg. "Tetrofuranose nucleoside phosphonic acids: Synthesis and properties." Collection of Czechoslovak Chemical Communications 76, no. 5 (2011): 503–36. http://dx.doi.org/10.1135/cccc2011038.

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New isoelectronic, non-isosteric phosphonate analogues of nucleoside 5′-phosphates featuring the phosphorus moiety directly attached on the sugar ring in the C4′ position are described. The analogues were synthesised by a nucleosidation reaction from tetrofuranosyl phosphonate synthons and silylated nucleobases. The pyrimidine compounds with erythro and threo configuration in both D- and L-series were prepared, and the structures were assigned by NMR spectroscopy. The results of NMR conformational studies show that all calculated conformers have a maximum pucker in the range typical for nucleo
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Dissertations / Theses on the topic "Erythro/threo configuration analysis"

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Santos, Sara Cristina Pereira Guedes Ribeiro. "Separação preparativa e caracterização espectroscópica dos principais monómeros da suberina da cortiça." Doctoral thesis, ISA, 2013. http://hdl.handle.net/10400.5/6157.

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Doutoramento em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia<br>Suberin is a vital biomacromolecule responsible for the protection of plants, and yet its molecular structure remains mostly unknown. Cork is the ideal material for suberin extraction because of its suberin content (≥40%) and availability in industrial quantities. Suberin is a polyester made of glycerol and long-chain α,ω-bifunctional fatty acids, mainly C18 ω-hydroxyacids and α,ω-diacids with mid-chain substituents, either an unsaturation, an epoxide or a vic-diol group. The objective of this wo
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