<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" article-type="research-article" dtd-version="1.2" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Physical Chemistry</journal-id><journal-title-group><journal-title>Russian Journal of Physical Chemistry</journal-title></journal-title-group><issn publication-format="print">0044-4537</issn><issn publication-format="electronic">3034-5537</issn><publisher><publisher-name>Russian Academy of Science</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.7868/S3034553725060049</article-id><title-group><article-title>THEORETICAL STUDY OF THE REACTION AMBER ANHYDRIDE WITH BENZOCAINE</article-title><trans-title-group xml:lang="ru"><trans-title>ТЕОРЕТИЧЕСКОЕ ИССЛЕДОВАНИЕ РЕАКЦИИ ЯНТАРНОГО АНГИДРИДА С БЕНЗОКАИНОМ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid"></contrib-id><name-alternatives><name xml:lang="en"><surname>Zarechnaya</surname><given-names>O.M.</given-names></name><name xml:lang="ru"><surname>Заречная</surname><given-names>О.М. </given-names></name></name-alternatives><email>olga777_62@mail.ru</email><xref ref-type="aff" rid="aff-1"></xref><xref ref-type="aff" rid="aff-2"></xref></contrib></contrib-group><aff-alternatives id="aff-1"><aff><institution xml:lang="ru">Институт физико-органической химии и углехимии им. Л.М. Литвиненко</institution><institution xml:lang="en">Institute of Organophysical Chemistry and Carbon Chemistry im. L. M. Litvinenko</institution></aff></aff-alternatives><aff-alternatives id="aff-2"><aff><institution xml:lang="ru"></institution><institution xml:lang="en"></institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-06-16" publication-format="electronic"><day>16</day><month>06</month><year>2025</year></pub-date><volume>99</volume><issue>6</issue><fpage>853</fpage><lpage>865</lpage><abstract xml:lang="en"><p>Possible reaction pathways of aminolysis of succinic anhydride by benzocaine — concerted and two-step — have been investigated by the density functional theory method (level ωB97M—V/ma-def2-QZVPP//r2SCAN-3c). For each mechanism three variants are considered: without catalysis, self-catalysis by the reagent molecule (benzocaine) and autocatalysis by the product (succinamide). Thermodynamic and activation parameters of all elementary stages in the gas phase are calculated. It is shown that different mechanisms are involved in the course of the reaction: at early stages, both concerted and two-stage pathways of self-catalysis can be realized with equal probability; as the product is formed, the preferred route of reaction becomes stage autocatalysis with the limiting first stage.</p></abstract><trans-abstract xml:lang="ru"><p>Методом теории функционала плотности (уровень ωВ97M—V/ma-def2-QZVPP//r²SCAN-3c) исследованы возможные пути реакции аминолиза янтарного ангидрида бензокаином — согласованный и двухстадийный. Для каждого механизма рассматриваются три варианта: без катализа, самокатализ молекулой реагента (бензокаина) и автокатализ продуктом (сукцинамидом). Рассчитаны термодинамические и активационные параметры всех элементарных стадий в газовой фазе. Показано, что в ходе реакции задействованы различные механизмы: на ранних этапах с равной вероятностью могут реализовываться и согласованный, и двухстадийный пути самокатализа, по мере образования продукта предпочтительным маршрутом реакции становится постадийный автокатализ с лимитирующей первой стадией.</p></trans-abstract><kwd-group xml:lang="en"><kwd>механизм аминолиз бензокаин янтарный ангидрид расчет DFT (ωВ97M—V/ma-def2-QZVPP//r²SCAN-3c)</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>механизм аминолиз бензокаин янтарный ангидрид расчет DFT (ωВ97M—V/ma-def2-QZVPP//r²SCAN-3c)</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа выполнена при финансовой поддержке Министерства науки и высшего образования РФ (государственное задание в сфере научной деятельности, проект № FRES-2023-0002)</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>Работа выполнена при финансовой поддержке Министерства науки и высшего образования РФ (государственное задание в сфере научной деятельности, проект № FRES-2023-0002)</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>B1</label><citation-alternatives><mixed-citation xml:lang="ru">Fantozzi N., Volle J.-N., Porcheddu A. et al. // Chem. 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