2080-25-3

Upstream product

• 186581-53-3 diazomethane 

Downstream Products

• 21759-06-8 4,5,4',5'-Tetramethoxy-6,6'-dibenzyloxydiphensaeure-dibenzylester 
• 21759-08-0 4,5,4',5'-Tetramethoxy-6,6'-dibenzyloxydiphensaeure-dimethylester 
• 21759-07-9 4,5,4',5'-Tetramethoxy-6,6'-dibenzyloxydiphensaeure 

Relevant academic research and scientific papers

Tannins and related polyphenols of melastomataceous plants. III. Nobotanins G, H and I, dimeric hydrolyzable tannins from Heterocentron roseum

Three new hydrolyzable tannin dimers, nobotanins G (6), H (12) and I (13), have been isolated from the leaves of Heterocentron roseum (Melastomataceae), and their structures were elucidated on the basis of chemical degradations and nuclear magnetic resonance spectral analyses. Nobotanin I (13) is a novel dimer possessing a depsidone-forming valoneoyl group in the molecule. Five known tannins, casuarictin (1), strictinin (2), geraniin (3), and nobotanins B (4) and F (5), were also isolated.

TAXIFOLIN APIOSIDE AND DAVURICIIN M1, A HYDROLYSABLE TANNIN FROM ROSA DAVURICA

Key Word Index - Rosa davurica; Rosaceae; (+)-taxifolin-3-O-β-D-apio-D-furanoside; dihydroflavonol apioside; tannin; davuriciin M1; ellagitannin.Abstract - The structure of a dihydroflavonol glycoside from the roots of Rosa davurica has been characterized as (+)-taxifolin-3-O-β-D-apio-D-furanoside. A new hydrolysable tannin, davuriciin M1, together with three known hydrolysable tannins, have also been isolated.The structure of new tannin was elucidated by spectroscopic and chemical methods.

Tannins and Related Compounds. Part 3. A New Phenolic Acid, Sanguisorbic Acid Dilactone, and Three New Ellagitannins, Sanguiins H-1, H-2, and H-3, from Sanguisorba officinalis

A new phenolic acid, sanguisorbic acid dilactone, and three new ellagitannins, sanguiins H-1, H-2, and H-3, have been isolated from the underground parts of Sanguisorba officinalis L. (Rosaceae).On the basis of chemical and spectroscopic evidence, sanguisorbic acid dilactone has been shown to possess a trimeric gallic acid structure and to be a structural isomer of valoneaic acid dilactone.Similarly, sanguiins H-1 and H-2 have been characterized as 1,6-digalloyl-2,3-(4,4',5,5',6,6'-hexahydroxydiphenoyl)glucose and 1-galloyl-2,4-(4,4',5,5',6,6'-hexahydroxydiphenoyl)-3,6-sanguisorboylglucose, respectively.Sanguiin H-3 has been shown mainly by spectroscopic data and analyses of partial hydrolysates to have a novel dimeric structure containing 2,3-(hexahydroxydiphenoyl)glucose and sanguiin H-2 moieties.