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Biflavones from the leaves of Araucaria bidwillii Hooker and Agathis alba foxworthy (araucariaceae)

✍ Scribed by N.U. Khan; M. Ilyas; W. Rahman; T. Mashima; M. Okigawa; N. Kawano

Publisher: Elsevier Science
Year: 1972
Tongue: French
Weight: 516 KB
Volume: 28
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(01)88913-4

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✦ Synopsis

Abetract-Six biflavones have bezn isolated from the leaf extracts of Araucarti bidwillii Hooker and Agarhrj alba Foxworthy; 7-0-methylcupressuflavone (2a) and 7.7"~-O-methylagathisflavone (1 c) are new compounds. The others are 7-0-methylagathisflavom (la), 4"',7-di-O-methylagathisflavone (lb), 7,7"-di-0-methylcupressuflavone (2b) and bilobetin (3). In addition, the presence of several other biflavones has been indicated by TLC examination (Table ).

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✍ Francisco Geraldo Barbosa; Mary Anne Sousa Lima; Edilberto Rocha Silveira 📂 Article 📅 2005 🏛 John Wiley and Sons 🌐 English ⚖ 116 KB

## Abstract Phytochemical analysis of leaves of the limonene–carvone chemotype of __Lippia alba__ led to the isolation of two biflavonoids with a new structural pattern with an ether linkage: 5,5″‐dihydroxy‐6,4′,6″,3″′,4″′‐pentamethoxy‐[C~7~OC~7″~]‐biflavone (**1**) and 4′,4,5,5″‐tetrahydroxy‐6,6