Results 171 to 180 of about 3,256 (222)

Determination of thebaine in crude thebaine samples by infrared and ultraviolet spectrophotometric methods

The Analyst, 1984
The determination of the thebaine content of crude thebaine concentrates by infrared and ultraviolet spectrophotometric methods is described. The results obtained with the two methods were found to compare favourably. The accuracy of these procedures was found to be superior to that of the K–34 (U.N.) method.
Arun Agnihotri, Satish Chandra Tewari, Pavan Khatod, Sadhana Banerjee, M. Balasubramanian   +4 more
openaire   +1 more source

Structural insights into thebaine synthase 2 catalysis

Biochemical and Biophysical Research Communications, 2020
Thebaine synthase 2 (THS2) that can transform (7S)-salutaridinol 7-O-acetate to thebaine catalyzes the final step of thebaine biosynthesis in Papaver somniferum. Here, the crystal structures of THS2 and its complex with thebaine are reported, revealing the interaction network in the substrate-binding pocket.
Chun-Chi Chen, Jing Xue, Wei Peng, Binju Wang, Lilan Zhang, Weidong Liu, Tzu-Ping Ko, Jian-Wen Huang, Shuyu Zhou, Jian Min, Lixin Ma, Longhai Dai, Rey-Ting Guo, Xuejing Yu   +13 more
openaire   +2 more sources

Thebaine Adducts with Maleimides. Synthesis and Transformations.

ChemInform, 2005
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
E.E. Shults, M.M. Shakirov, G.A. Tolstikov, V.N. Kalinin, G. Schmidhammer   +4 more
openaire   +1 more source

Über das β‐Dihydro‐thebain

Helvetica Chimica Acta, 1950
AbstractThebain wird durch LiAlH4 in ein Dihydro‐thebain (β‐Dihydrothebain, VI) übergeführt, dessen Konstitution ermittelt worden ist. Die Verbindung ist stereoisomer mit dem schon bekannten „Thebainon‐enol‐methyläther”︁ (V) und unterscheidet sich von diesem durch Konfigurationsänderung am C‐Atom 14.
H. Schmid, P. Karrer
openaire   +1 more source

Thebaine from Root Cultures of Papaver bracteatum

Planta Medica, 1982
Root cultures derived from cell suspension cultures of Papaver bracteatum were shown to produce thebaine (yield 0.03%).
S W, Zito, E J, Staba
openaire   +2 more sources

Cyclo-adducts of thebaine with nitrosoarenes

Journal of the Chemical Society, Perkin Transactions 1, 1979
Thebaine (1) reacts reversibly with various nitroso-arenes to form cyclo-adducts by 1,4-addition of the nitrosogroup to the conjugated diene system of the alkaloid. Adducts (2) of thebaine with nitrosobenzene and with 4-chloro-, 4-methyl-, 3-methoxy-, and 4-nitro-nitrosobenzene have been prepared in good yield.
Gordon W. Kirby, Kenneth W. Bentley, Peter Horsewood, Serjinder Singh   +3 more
openaire   +1 more source

(−)-Thebaine

Acta Crystallographica Section C Crystal Structure Communications, 1996
C. H. Mahler, E. D. Stevens, M. L. Trudell, S. P. Nolan   +3 more
openaire   +1 more source

Studies on thebaine, III. Oxidative colorimetric analysis of thebaine

Archiv der Pharmazie, 1985
O F, Ellingsen, K E, Malterud, J K, Wold
openaire   +2 more sources

Isoneopine from thebaine

The Journal of Organic Chemistry, 1983
Ahmad Seyed-Mozaffari, Sydney Archer
openaire   +1 more source

Colorimetric Determination of Thebaine in Papauer Bracteatum

Journal of Pharmaceutical Sciences, 1981
A rapid colorimetric test for the determination of thebaine in dried, extracted Papaver bracteatum is described. The method is based on the development of an orange color formed by the nitroso color reaction for phenols. The absorption peak is near 450 nm. The linear range response is from 0 to 1.0 mg of thebaine.
openaire   +2 more sources