Advances in radical-based catalytic reactions have created a demand for understanding their mechanistic underpinnings. Here, we present the isolation, structural elucidation, and theoretical analysis of catalytically relevant charge-transfer species formed between azidyl radical (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO). The unusual bond angles pancake bonding these two fragments highligh...

various biological activities, such as antitumor, antimalarial, antifeedant, insecticidal, antiinflammatory, amoebicidal, and herbicidal effects. We are interested in such biologically active compounds and have isolated many quassinoids from plants, such as Brucea antidysenterica, Picrasma ailanthoides, and Brucea javanica. As part of these studies, we investigated the isolation of quassinoids ...

Abstract Dietary polyphenols like epigallocatechin-3-gallate (EGCG)—which represents the most abundant flavan-3-ol in green tea—are subject of several studies regarding their bioactivity and health-related properties. On many occasions, cell culture or vitro experiments form basis published data. Although stability these compounds is observed to be low, reported effects are directly related par...

Introduction. – Bletilla striata (Thunb.) Reichb. f. (Orchidaceae) is mainly distributed in East Asia, and its tubers are used as a Chinese traditional medicine for the treatment of tuberculosis and haemorrhage of the stomach or lung [1]. Previous phytochemical studies on Bletilla species have led to the isolation of phenanthrene derivatives [2 – 11], bibenzyls [2] [4], flavonoids and phenolic ...