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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of General Chemistry</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of General Chemistry</journal-title><trans-title-group xml:lang="ru"><trans-title>Журнал общей химии</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0044-460X</issn><issn publication-format="electronic">3034-5596</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">699464</article-id><article-id pub-id-type="doi">10.7868/S3034559625110027</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Effect of Methylation of 5-Hydroxy-6-methyluracil on Lipophilicity and Solubility in Water</article-title><trans-title-group xml:lang="ru"><trans-title>ВЛИЯНИЕ МЕТИЛИРОВАНИЯ 5-ГИДРОКСИ-6-МЕТИЛУРАЦИЛА НА ЛИПОФИЛЬНОСТЬ И РАСТВОРИМОСТЬ В ВОДЕ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0680-6182</contrib-id><name-alternatives><name xml:lang="en"><surname>Petrova</surname><given-names>S. F</given-names></name><name xml:lang="ru"><surname>Петрова</surname><given-names>С. Ф</given-names></name></name-alternatives><email>petrova_sf89@anrb.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0009-6868-7746</contrib-id><name-alternatives><name xml:lang="en"><surname>Fayzrakhmanov</surname><given-names>I. S</given-names></name><name xml:lang="ru"><surname>Файзрахманов</surname><given-names>И. С</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1918-7210</contrib-id><name-alternatives><name xml:lang="en"><surname>Ivanov</surname><given-names>S. P</given-names></name><name xml:lang="ru"><surname>Иванов</surname><given-names>С. П</given-names></name></name-alternatives><email>-</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Ufa Institute of Chemistry of the Ufa Federal Research Center of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Уфимский институт химии Уфимского федерального исследовательского центра Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Ufa University of Science and Technology</institution></aff><aff><institution xml:lang="ru">Уфимский университет науки и технологии</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-11-15" publication-format="electronic"><day>15</day><month>11</month><year>2025</year></pub-date><volume>95</volume><issue>11-12</issue><issue-title xml:lang="en">VOL 95, NO11-12 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 95, №11-12 (2025)</issue-title><fpage>499</fpage><lpage>504</lpage><history><date date-type="received" iso-8601-date="2025-12-25"><day>25</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-12-15"/></permissions><self-uri xlink:href="https://transsyst.ru/0044-460X/article/view/699464">https://transsyst.ru/0044-460X/article/view/699464</self-uri><abstract xml:lang="en"><p>The values of lipophilicity and solubility in aqueous solutions at pH = 7.4 and 25°C were determined by theoretical and experimental (HPLC) methods for 5-hydroxy-6-methyluracil and its N- and O-methylated derivatives: 5-methoxy-6-methyluracil, 5-hydroxy-3,6-dimethyluracil, 5-hydroxy-1,3,6-trimethyluracil and 5-methoxy-1,3,6-trimethyluracil. It was found that the introduction of methyl groups into the 5-hydroxy-6-methyluracil molecule leads to an increase in lipophilicity and solubility in aqueous solutions.</p></abstract><trans-abstract xml:lang="ru"><p>Теоретическими и экспериментальным (ВЭЖХ) методами определены значения липофильности и растворимости в водных растворах при рН = 7.4 и 25°С для 5-гидрокси-6-метилурацила и его N- и O-метилированных производных: 5-метокси-6-метилурацила, 5-гидкрокси-3,6-диметилурацила, 5-гидрокси-1,3,6-триметилурацила и 5-метокси-1,3,6-триметилурацила. Установлено, что введение метильных групп в молекулу 5-гидрокси-6-метилурацила приводит к увеличению липофильности и растворимости в водных растворах.</p></trans-abstract><kwd-group xml:lang="en"><kwd>5-hydroxy-6-methyluracil</kwd><kwd>N- and O-methyl derivatives</kwd><kwd>lipophilicity</kwd><kwd>solubility</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>5-гидрокси-6-метилурацил</kwd><kwd>N- и O-метилпроизводные</kwd><kwd>липофильность</kwd><kwd>растворимость</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках государственного задания Министерства науки и высшего образования (№ 123011300044-5).</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>IUPAC Gold Book. https://goldbook.iupac.org/terms/view/L03572</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>Chiodi D., Ishihara Y. // Future Med. Chem. 2025. Vol. 17. N 9. 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