Republican Scientific and Practical Conference on “Innovative Educational Technologies in the Integration of Natural Sciences: Tradition and Modernity”

This conference was included in the plan of scientific and scientific-technical events to be held at the international and national levels in 2026, pursuant to Order No. 11 of the Ministry of Higher Education, Science and Innovation dated January 16, 2026. It was organized by the Department of Natural Sciences of Namangan State Pedagogical Institute on November 13–14, 2026.

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Oʻzbekcha

YAMR SPEKTROSKOPIYASI USULI YORDAMIDA TABIIY SESKVITERPEN LAKTONLARNI OʻRGANISH

Published
14.11.2026
Journal
Republican Scientific and Practical Conference on “Innovative Educational Technologies in the Integration of Natural Sciences: Tradition and Modernity”
Issue
“Innovative Educational Technologies in the Integration of Natural Sciences: Tradition and Modernity” Republican Scientific and Practical Conference
Pages
147-150
DOI
10.5281/zenodo.24074539

Authors

Abstract

Tabiiy seskviterpen laktonlar tarkibidagi C15 skelet, lakton halqasi va stereomarkazlar ularning aniq identifikatsiyasini murakkablashtiradi, ayniqsa aralash fraksiyalarda bir-biriga yaqin signal konturlari kuzatilganda. Tadqiqotning maqsadi 12 ta tabiiy fraksiyada seskviterpen laktonlarning tuzilishini YaMR maʻlumotlari asosida aniqlash va 3 ta tayanch birikma bilan taqqoslab tasdiqlashdan iborat boʻldi. ¹H YaMR, ¹³C YaMR, DEPT-135, HSQC, HMBC va NOESY tajribalari bir xil erituvchi sharoitida bajarildi; signal tayinlash jarayonida kimyoviy siljishlar, korrelyatsion bogʻlanishlar va fazoviy yaqinliklar birgalikda tahlil qilindi. Natijalar YaMR spektroskopiyasi tabiiy seskviterpen laktonlarda tezkor strukturaviy belgilash, funksional guruhlarni ajratish va stereokimyoni birlashtirib baholash uchun ishonchli analitik platforma ekanini koʻrsatdi.

Keywords

HMBC NOESY D korrelyatsiya kimyoviy siljishlar signal tayinlash stereokimyoviy tahlil strukturaviy identifikatsiya tabiiy mahsulotlar

Other language versions

Русский
Сложное сочетание C15-скелета, лактонного цикла и стереоцентров в природных сесквитерпеновых лактонах затрудняет их точную идентификацию, особенно когда в смешанных фракциях наблюдаются близкие по положению сигналы. Целью работы было установить строение сесквитерпеновых лактонов в 12 природных фракциях на основе данных ЯМР и подтвердить выводы сравнением с 3 эталонными соединениями. Эксперименты ¹H ЯМР, ¹³C ЯМР, DEPT-135, HSQC, HMBC и NOESY проводили в одинаковой растворной среде; при назначении сигналов совместно анализировали химические сдвиги, корреляционные связи и пространственные сближения. Полученные данные показали, что ЯМР-спектроскопия является надежной аналитической платформой для быстрого структурного маркирования, разделения функциональных групп и совмещенной оценки стереохимии природных сесквитерпеновых лактонов
D корреляция HMBC химические сдвиги NOESY присвоение сигналов стереохимический анализ структурная идентификация природные соединения
English
The combined presence of a C15 skeleton, a lactone ring, and several stereocenters makes the identification of natural sesquiterpene lactones difficult, especially when closely spaced resonances appear in mixed fractions. The aim of the study was to determine the structure of sesquiterpene lactones in 12 natural fractions from NMR data and to verify the assignments against 3 reference compounds. ¹H NMR, ¹³C NMR, DEPT-135, HSQC, HMBC, and NOESY experiments were carried out in the same solvent system; chemical shifts, correlation links, and spatial proximities were interpreted together during signal assignment. The results show that NMR spectroscopy is a reliable analytical platform for rapid structural marking, functional-group differentiation, and integrated stereochemical evaluation of natural sesquiterpene lactones.
D correlation HMBC chemical shifts NOESY signal assignment stereochemical analysis structural identification natural products.

References

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2. Schmidt T.J. Structure elucidation of sesquiterpene lactones by NMR spectroscopy // Phytochemistry Reviews. — 2022. — Vol.21. — №4. — P. 1021-1054. DOI: 10.1007/s11101-022-09802-1
3. Mamadalieva N.Z., Abdullaev N.D., Tashpulatov S.H. Oʻsimliklardan ajratib olingan seskviterpen laktonlarning YaMR spektroskopiyasi yordamida tuzilishini aniqlash // Oʻzbekiston kimyo jurnali. — 2021. — №3. — B. 45-52.
4. Zakirov U.U., Sharipov A.A., Mamadalieva N.Z. Seskviterpen laktonlar tarkibidagi funksional guruhlarni YaMR usuli bilan identifikatsiya qilish // Tabiiy birikmalar kimyosi. — 2023. — №1. — B. 33-41.
5. Claridge T.D.W. High-Resolution NMR Techniques in Organic Chemistry. — 3rd ed. — Oxford: Elsevier, 2016. — 560 p.
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