At 25.0 °C the specific rates of solvolysis for allyl and vinyl chloroformates have been determined in a wide mix of pure and aqueous organic mixtures. In all the solvents studied, vinyl chloroformate was found to react significantly faster than allyl chloroformate. Multiple correlation analyses of these rates are completed using the extended (two-term) Grunwald-Winstein equation with incorporation of literature values for solvent nucleophilicity (NT) and solvent ionizing power (YCl). Both substrates were found to solvolyze by similar dual bimolecular carbonyl-addition and unimolecular ionization channels, each heavily dependent upon the solvents nucleophilicity and ionizing ability.
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http://dx.doi.org/10.3390/ijms14047286 | DOI Listing |
Org Biomol Chem
January 2025
Department of Chemistry, Western Washington University, Bellingham, WA 98225, USA.
Vinylic phenylsulfones containing a β-hydroxyl stereocenter undergo a diastereoselective isomerization to the corresponding allylic isomer upon treatment with 1,8-diazabicyclo(5.4.0)undec-7-ene (DBU).
View Article and Find Full Text PDFMolecules
December 2024
Department of Physical Chemistry, Faculty of Chemistry, University of Łódź, Pomorska 163/165, 90-236 Łódź, Poland.
Extracts from natural waste like bark or leaves are great sources of phytochemicals, which contain functional groups (hydroxyl, carboxylic, vinyl, allyl) attractive in terms of polymer synthesis. In this study, the synthesis of epoxy with an extract of Scots pine bark as a natural co-hardener was evaluated. Ultraviolet-visible (UV-Vis) spectroscopy was used for the identification of phytochemicals with conjugated dienes and quantification of TPC.
View Article and Find Full Text PDFOrg Lett
January 2025
Medicinal & Process Chemistry Division, Council of Scientific and Industrial Research (CSIR)-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram Extension, Sitapur Road, Post Office Box 173, Lucknow 226031, India.
A remarkably simple and efficient double defluorinative [3 + 3] annulation approach involving -phenyl-α-fluoro-α-phenylsulfonylacetamide and 2-CF-alkenes to access -phenyl-3,6-difluoropyridone derivatives has been achieved. The key to the success of this single-step synthesis of difluoropyridones is the strategic utilization of 2-CF-alkenes for consecutive allylic and vinylic substitution reactions and a desulfonylation cascade. We could also show that these difluoropyridones serve as a versatile platform for C-6-selective defluorinative functionalizations.
View Article and Find Full Text PDFFront Chem
December 2024
Department of Chemistry, University of Lucknow, Lucknow, India.
Rhodium(III) catalysis has been used for C-H activation of -nitrosoanilines with substituted allyl alcohols. This method provides an efficient synthesis of the functional -nitroso β-aryl aldehydes and ketones with low catalyst loading, high functional group tolerance, and superior reactivity of allyl alcohols toward -nitrosoanilines. We demonstrated that reaction also proceeds through the one-pot synthesis of -nitrosoaniline, followed by subsequent, C-H activation.
View Article and Find Full Text PDFEur J Med Chem
December 2024
A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, bld. 1, Moscow, 119334, Russia. Electronic address:
Thevinols and their 3-O-demethylated relatives, orvinols, are derivatives of the Diels-Alder adduct of natural alkaloid thebaine with methyl vinyl ketone. Taken together, thevinols and orvinols constitute an important family of opioid receptor (OR) ligands playing an important role in both the OR mediated antinociception and OR antagonism. Herein, we disclose for the first time the antagonist activity of the N-allyl substituted orvinol derivative fluorinated within the pharmacophore associated with C(20) and its surrounding.
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