Relevant bibliographies by topics / Stereoisomeric forms

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  2. Dissertations / Theses
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Academic literature on the topic 'Stereoisomeric forms'

Author: Grafiati
Published: 5 June 2025
Last updated: 1 August 2025

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Journal articles on the topic "Stereoisomeric forms"

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Sheikh, Ishfaq Ahmad, and Mohd Amin Beg. "Structural Aspects of Potential Endocrine-Disrupting Activity of Stereoisomers for a Common Pesticide Permethrin against Androgen Receptor." Biology 10, no. 2 (2021): 143. http://dx.doi.org/10.3390/biology10020143.

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Endocrine-disrupting chemicals (EDCs) are a serious global public health and environmental concern. Pyrethroids are insecticide chemicals that are extensively used for crop protection and household purposes but have been identified as EDCs. On account of their ubiquitous environmental presence, human exposure occurs via food, dermal, or inhalation routes and is associated with health problems, including reproductive dysfunction. Permethrin is the most commonly used pyrethroid, and with two chiral centers in its structure, it has four stereoisomeric forms (two enantiomer pairs), i.e., permethri
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Leitgeb, Balázs. "Spatial relationships between the pharmacophores of endomorphin-2: a comparative study of stereoisomers." Open Chemistry 10, no. 6 (2012): 1791–98. http://dx.doi.org/10.2478/s11532-012-0105-3.

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AbstractThe spatial relationships between the pharmacophore elements were investigated in the case of four different stereoisomeric forms of opioid tetrapeptide, endomorphin-2, taking into account the L-D and cis-trans isomerisms. On the basis of distances and angles measured between the pharmacophoric points, a comparative analysis of conformational distributions was performed, applying a variety of distance-angle maps. The results obtained by this theoretical study indicated that the stereoisomers of endomorphin-2 could be distinguished from one another, based on the comparative analysis of
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Bello, Jan E., J. Steven McElfresh, and Jocelyn G. Millar. "Isolation and determination of absolute configurations of insect-produced methyl-branched hydrocarbons." Proceedings of the National Academy of Sciences 112, no. 4 (2015): 1077–82. http://dx.doi.org/10.1073/pnas.1417605112.

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Although the effects of stereochemistry have been studied extensively for volatile insect pheromones, little is known about the effects of chirality in the nonvolatile methyl-branched hydrocarbons (MBCHs) used by many insects as contact pheromones. MBCHs generally contain one or more chiral centers and so two or more stereoisomeric forms are possible for each structure. However, it is not known whether insects biosynthesize these molecules in high stereoisomeric purity, nor is it known whether insects can distinguish the different stereoisomeric forms of MBCHs. This knowledge gap is due in par
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Leitgeb, Balázs. "Conformational Similarities and Dissimilarities Between the Stereoisomeric Forms of Endomorphin-2." Chemical Biology & Drug Design 79, no. 3 (2011): 313–25. http://dx.doi.org/10.1111/j.1747-0285.2011.01275.x.

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Yakovleva, M. P., V. A. Vydrina, N. M. Ishmuratova, and G. Yu Ishmuratov. "CONTRIBUTION OF UFA SCIENTISTS TO THE CHEMISTRY OF OPTICALLY ACTIVE SEX PHEROMONE OF PINE SAWFLIES." ÈKOBIOTEH 3, no. 4 (2020): 634–42. http://dx.doi.org/10.31163/2618-964x-2020-3-4-634-642.

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Pine sawflies of the genera Neodiprion, Diprion and Gilpinia (Diprionidae) are malignant and economically important pests of coniferous trees. The most effective and environmentally safe method of controlling and regulating the number of pine sawflies is the use in traps of synthetically obtained sex feromone, identified for its different species as acetates and propionates of 3,7-dimethyl-2-pentadecan-2-ol (diprionol) in the form of various stereoisomeric forms due to the presence of three asymmetric carbon atoms. At the same time, it was noted that the 2S configuration of the optical centre
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Gill, Brendon D., Jackie E. Wood та Harvey E. Indyk. "Analysis of α-Tocopherol Stereoisomers in Fortified Infant Formula by Chiral Chromatography". Journal of AOAC INTERNATIONAL 104, № 3 (2021): 725–31. http://dx.doi.org/10.1093/jaoacint/qsab012.

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Abstract Background Direct measurement of the bioavailable α-tocopherol content presents a significant analytical challenge and requires chiral separation of the α-tocopherol stereoisomers. Objective The objective of the study was to validate an analytical method for the analysis of α-tocopherol stereoisomers in infant formulas and dairy products. Method Samples were saponified at elevated temperature and lipophilic components were extracted into an organic solvent, with subsequent chromatographic separation of the α-tocopherol stereoisomers achieved by HPLC with a chiral column and fluorescen
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Diukendjieva, Antonia, Merilin Al Sharif, Petko Alov, Tania Pencheva, Ivanka Tsakovska, and Ilza Pajeva. "ADME/Tox Properties and Biochemical Interactions of Silybin Congeners: In silico Study." Natural Product Communications 12, no. 2 (2017): 1934578X1701200. http://dx.doi.org/10.1177/1934578x1701200208.

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Silymarin, the active constituent of Silybum marianum (milk thistle), and its main component, silybin, are products with well-known hepatoprotective, cytoprotective, antioxidant, and chemopreventative properties. Despite substantial in vitro and in vivo investigations of these flavonolignans, their mechanisms of action and potential toxic effects are not fully defined. In this study we explored important ADME/Tox properties and biochemical interactions of selected flavonolignans using in silico methods. A quantitative structure–activity relationship (QSAR) model based on data from a parallel a
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Yakovleva, Marina Petrovna, Valentina Afanasievna Vydrina, Nailya Mavletzyanovna Ishmuratova, and Gumer Yusupovich Ishmuratov. "OPTICALLY ACTIVE PINE SEX PHEROMONE SAWS: SYNTHESIS AND BIOLOGICAL ACTIVITY." chemistry of plant raw material, no. 2 (June 12, 2024): 26–54. https://doi.org/10.14258/jcprm.20240312696.

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The most dangerous pest for coniferous trees, by right, can be called pine sawflies of the genera Diprion, Neodiprion and Gilpinia (Diprionidae) – insects that can cause tremendous harm to plants or even destroy them. Scots pines suffer the most from the pest, especially at the age of 20–40, however, ornamental plant species are often subject to mass attack by insects. The review article presents mechanical, biological and chemical methods of combating pine sawflies, the main part of the review is devoted to the use of the sex pheromone of males of these pests, namely, identification methods (
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Serra, Stefano, Davide De Simeis, and Sara Papili. "A Practical Laboratory-Scale Synthesis of All Eight Stereoisomeric Forms of Terpene Linalool Oxide." Chemistry 3, no. 4 (2021): 1247–57. http://dx.doi.org/10.3390/chemistry3040090.

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In this work, we describe a user-friendly procedure for the preparation of all the isomeric forms of the terpene linalool oxide. The presented method is based on the transformation of the linalool enantiomers into the corresponding diastereoisomeric mixtures of the two furanoid oxides and two pyranoid oxides. Taking advantage of the different steric hindrance of the hydroxyl functional groups, the pyranoid forms were separated as a diastereoisomeric mixtures of their benzoate esters. Conversely, the cis- and trans-furanoid isomers were transformed in the corresponding acetates, which were dire
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Gasanov, Arif G., Ilgar G. Ayyubov, Gulsum E. Hajiyeva, and Fidan S. Qurbanova. "Study of the relationship between geometric isomerism and biologically active properties of compounds." Izvestiya of Saratov University. Chemistry. Biology. Ecology 21, no. 4 (2021): 405–14. http://dx.doi.org/10.18500/1816-9775-2021-21-4-405-414.

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The results of the research in the field of studying the relationship of the geometric structure of organic compounds with their biological activity are presented. It has been shown that the stereospecific structure of organic and inorganic molecules can have a direct effect on the biologically active properties of substances. Among the known types of stereoisomerism (geometric and optical), this work summarizes the effect of various types of geometric isomerism on the bioactivity of compounds. In addition, the results of the authors’ own research are presented. In particular, the results of s
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Dissertations / Theses on the topic "Stereoisomeric forms"

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PEI-YING, LI, and 李沛瑩. "Synthesis of Demethoxyfumitremorgin C Analogues Containing All Stereoisomeric Forms as Potential Cell Cycle Inhibitors." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/30639743211715887786.

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碩士<br>國立中正大學<br>化學研究所<br>91<br>Demothoxyfumitriemorgin C analogues are indole alkaloid-based fungal products that act on the G2/M phase of the cell cycle. Because of the important biological activities, it led us to initiate the chemical synthesis of the indolyl diketopiperazine library. In our synthesis, the Pictet-Spengler condensation of L/D-tryptophan methyl esters and excessive aldehydes furnished the synthesis of various diastereoisomeric tetrahydro-β-carbolines. The subsequent treatment of the tetrahydro-β-carbolines with Cbz-L/D-proline acid chlorides in the presence of di
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Book chapters on the topic "Stereoisomeric forms"

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Zhbankov, R. G., V. M. Andrianov, S. P. Firsov, et al. "Spectroscopy of Stereoisomeric forms of Mono- and Polysaccharides." In Spectroscopy of Biological Molecules: Modern Trends. Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5622-6_118.

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Doraiswamy, L. K. "Asymmetric Synthesis." In Organic Synthesis Engineering. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195096897.003.0015.

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The manufacture of fine chemicals, particularly drugs, fragrances, and flavors, is undergoing a major revolution now as a result of the capability of chemists to prepare these chemicals, mainly drugs, in their purest isomeric forms (as stereoisomers). This shift to pure forms has been described by Brown in the following words (1990) (see also Deutsch, 1991): “A mixture of stereoisomers in a medicine will (now) need to be justified just the same way as any other mixture of compounds.” Indeed, in the United States today (as in many other advanced countries), the use of pure enantiomeric forms is
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Crowe, Jonathan, and Tony Bradshaw. "Isomerism: generating chemical variety." In Chemistry for the Biosciences. Oxford University Press, 2021. http://dx.doi.org/10.1093/hesc/9780198791041.003.0009.

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This chapter explores the concept of isomerism—the joining together of identical groups of atoms to form different molecules. Structural isomers are molecules that have the same chemical composition but whose atoms are joined together in different ways. Stereoisomers possess the same atoms, which exhibit the same connectivities. However, stereoisomers exhibit different configurations. Stereoisomers fall into two groups: cis–trans isomers, and enantiomers. Cis–trans isomers are stereoisomers that possess groups of atoms locked in specific configurations, while enantiomers are non-superimposable
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Compton, Robert N., and Michael A. Duncan. "Raman Spectroscopy Applied to Molecular Conformational Analysis." In Laser Experiments for Chemistry and Physics, Second Edition, 2nd ed. Oxford University PressOxford, 2024. https://doi.org/10.1093/oso/9780198900825.003.0030.

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Abstract Conformational isomers represent one form of stereoisomer in which the two structures can be interconverted by simple rotations about a single bond. Such conformational isomers are called rotamers and play a role in many areas of Chemistry. In this experiment the 1,2-dichloroethane rotomer molecule is studied using Raman spectroscopy at temperatures ranging from room temperature to that of liquid nitrogen. The anti and gauche forms are clearly differentiated in the Raman spectra. The enthalpy difference, ΔHf, between the anti and gauche forms is then determined from a van ‘t Hoff plot
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Cook, Michael, and Philippa Cranwell. "Isomerism." In Organic Chemistry, edited by Elizabeth Page. Oxford University Press, 2017. http://dx.doi.org/10.1093/hesc/9780198729518.003.0002.

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This chapter discusses isomerism, which describes the different ways in which we can arrange the atoms in a molecule with a fixed formula. This arrangement of atoms can take the form of constitutional (structural) isomerism, where the atoms are joined in a different order, or stereoisomerism, where the atoms are arranged differently in space. Stereoisomerism is subdivided into conformational isomerism and configurational isomerism. Two conformational isomers can be converted into each other (interconverted) by rotation around single bonds, whereas configurational isomers cannot be interconvert
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Okusecyama, Tadashi, and Howard Maskill. "Stereochemistry and Molecular Chirality." In Organic Chemistry. Oxford University Press, 2013. http://dx.doi.org/10.1093/hesc/9780199693276.003.0011.

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This chapter discusses three-dimensional structures of molecules and their mirror images. It then presents further types of stereoisomerism which occur when a molecule and its mirror image are not identical. The chapter notes that some molecules have the property of handedness or chirality, which relates to the non-superposability of mirror image forms. Most naturally occurring organic compounds have this property and the biochemical world, in general, is chiral at the molecular level; consequently, chirality is tremendously important in the chemistry of life. The chapter displays how chiralit
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Grossel, Martin. "The conformational analysis of alicyclic rings." In Alicyclic Chemistry. Oxford University Press, 1997. http://dx.doi.org/10.1093/hesc/9780198501046.003.0002.

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This chapter reviews several aspects of molecular stereochemistry, which is important in the discussion about the behavior of alicyclic compounds. It analyses various types of isomerism in a given molecular formula, such as the assembly of atoms in a variety of different ways that lead to a number of alternative chemical structures and different atom-atom connectivity patterns. It also describes structural arrangements that form additional isomers and have the same connectivity but are different in the spatial arrangement of the atoms within the molecule. The chapter analyzes enantiomers and d
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Morrow, Gary W. "Biosynthesis of Carbohydrates and Amino Acids." In Bioorganic Synthesis. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780199860531.003.0006.

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We have already seen that some of the basic building blocks used in the biosynthesis of natural products are amino acids such as phenylalanine, tyrosine, and others. These and other crucial construction materials such as the acyl group in acetyl-CoA are all ultimately derived from carbohydrates. In this chapter, we will present an abbreviated overview of the components of carbohydrate structure and metabolism sufficient for our purposes going forward, with a schematic flowchart showing how carbohydrates and amino acids are modified, combined, and branched off in various ways to yield the disti
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Calvert, Jack G., John J. Orlando, William R. Stockwell, and Timothy J. Wallington. "The Hydroxyl Radical and Its Role in Ozone Formation." In The Mechanisms of Reactions Influencing Atmospheric Ozone. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780190233020.003.0007.

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Although the HO radical is present in the sunlight-irradiated troposphere at very low concentrations, only about 106 molecules cm−3, it is the most important trace component in our atmosphere. It is a highly reactive transient species and is responsible for initiating the oxidation of the majority of organic compounds in the troposphere. It initiates the chain reactions that produce ozone. All the saturated, H-atom containing molecules react with HO through abstraction of an H atom. In the case of the simplest alkane, methane, reaction (1) leads to the formation of a water molecule and an alky
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