Results 11 to 20 of about 19,506 (250)
Antimicrobial Abietane-Type Diterpenoids from Plectranthus punctatus
Molecules, 2017 Four new para-benzoquinone containing abietane-type diterpenoids (1–4) along with thirteen known diterpenoids (5–17) were isolated from the roots of Plectranthus punctatus.
Negera Abdissa +2 more
doaj +1 more source
A visible-light-induced, metal-free bis-arylation of 2,5-dichlorobenzoquinone
Beilstein Journal of Organic Chemistry, 2021 A metal-free protocol for the direct bis-arylation of 2,5-dichlorobenzoquinone with aryldiazonium salts is reported. The reactive salts are generated in situ and converted to radicals through irradiation with visible light.
Pieterjan Winant, Wim Dehaen
doaj +1 more source
Aqueous Ti(IV)-Catalyzed Diels-Alder Reaction
Molecules, 2007 The aqueous Diels-Alder reaction of 1,3-cyclohexadiene with 1,4-benzoquinone was compared and contrasted to the same reaction catalyzed with Flextyl P™, a novel Ti(IV) performance catalyst.
Kyle E. Litz
doaj +1 more source
Design, synthesis and α-glucosidase inhibition study of novel embelin derivatives
Journal of Enzyme Inhibition and Medicinal Chemistry, 2020 Embelin is a naturally occurring para-benzoquinone isolated from Embelia ribes (Burm. f.) of the Myrsinaceae family. It was first discovered to have potent inhibitory activity (IC50 = 4.2 μM) against α-glucosidase in this study.
Xiaole Chen +11 more
doaj +1 more source
4'-Bromophenyl Triptycene-2,5-diol
Molbank, 2013 Diels Alder reaction of 4-bromophenylquinone (Br-PQ) with anthracene, followed by reduction affords the desired 4'-bromophenyl triptycene-2,5-diol (T-Br-PH).
Mahadevappa Y. Karidurganavar +2 more
doaj +1 more source
ChemElectroChem, 2023 Selective oxidation is still a challenge for targeted conversion of biomass derived substance to high‐value added products. Herein we report an efficient electrochemical strategy to transform phenol into p‐benzoquinone, by tandem oxidations of CuSO4 and ...
Weizhuo Xu +4 more
doaj +1 more source
Beilstein Journal of Organic Chemistry, 2018 [Bis(trifluoroacetoxy)iodo]benzene (BTI) and (diacetoxyiodo)benzene (DIB) efficiently promote the formation of acylnitroso species from hydroxamic acids in the presence of various dienes to give the corresponding hetero-Diels–Alder (HDA) adducts in ...
Hisato Shimizu +5 more
doaj +1 more source
Novel Anti-Aging Benzoquinone Derivatives from Onosma bracteatum Wall
Molecules, 2019 The aim of this study was to investigate anti-aging molecules from Onosma bracteatum Wall, a traditional medicinal plant used in the Unani and Ayurvedic systems of medicine. During bioassay-guided isolation, two known benzoquinones, allomicrophyllone (1)
Umer Farooq +3 more
doaj +1 more source
Marine Drugs, 2017 Microorganisms are important sources for screening bioactive natural products. However, natural products from deep-sea microbes have not been extensively explored. In this study, the metabolites of bacteriophage GVE2 -infected (Geobacillus sp. E263 virus)
Chenxi Xu +3 more
doaj +1 more source
QUINONES FROM THE SEEDS OF IRIS SPURIA VAR. HALOPHILA [PDF]
Bulletin of Pharmaceutical Sciences. Assiut University, 1995 From the seeds of Iris spuria var. halophila, 3 quinones were isolated. On the basis of spectroscopic methods and chemical evidence, the quinones were shown to be primin (2-methoxy, 6-pentyl benzoquinone), dehydroirisoquin (2-hydroxy, 3-octadecenyl, 5 ...
Omar Abdallah +3 more
doaj +1 more source