Structural reassignment of the dehydration product of 2′-Hydroxywarfarin

1977 ◽  
Vol 14 (2) ◽  
pp. 319-320 ◽  
Author(s):  
William H. Porter ◽  
William F. Trager
Keyword(s):  
Dehydration Product

THE STRUCTURE OF RETAMINE AND THE PARTIAL SYNTHESIS OF THE (−)-ENANTIOMORPH

1965 ◽  
Vol 43 (7) ◽  
pp. 2012-2016 ◽  
Author(s):  
Kju Hi Shin ◽  
L. Fonzes ◽  
Léo Marion
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Thin Layer ◽  
Thin Layer Chromatography ◽  
Opposite Sign ◽  
Optical Rotation ◽  
Partial Synthesis ◽  
Dehydration Product ◽  
Layer Chromatography ◽  
Nuclear Magnetic

Previous work by many authors has led to the assumption that retamine might be (+)-12-hydroxysparteine. A partial synthesis of the enantiomorph of this compound has been effected by dehydration of (+)-13-hydroxylupanine and hydroboration of the product. The dehydration product consisted of two components that were separated by thin-layer chromatography and identified by the characteristics of their nuclear magnetic resonance (n.m.r.) spectra as Δ12,13-and Δ13,14-dehydrolupanine. Hydroboration of the Δ12,13-isomer gave rise to (−)-12-hydroxy-sparteine having, in thin-layer chromatography, the same Rf value as natural retamine and the same optical rotation numerically, although of opposite sign. The synthetic base had the same infrared and n.m.r. spectra as the alkaloid and the two had superimposable Debye–Scherrer patterns. Evidence is given showing the hydroxyl to be equatorial.

Spinifex‐like textured metaperidotites from the Higo Metamorphic Rocks, Japan, a possible high‐pressure dehydration product of antigorite serpentinite

Island Arc ◽  
2020 ◽  
Vol 30 (1) ◽  
Author(s):  
Tadao Nishiyama ◽  
Hibiki Eguchi ◽  
Dai Shiosaki ◽  
Akira Yoshiasa ◽  
Nobutatsu Mochizuki ◽  
...  
Keyword(s):  
High Pressure ◽  
Metamorphic Rocks ◽  
Dehydration Product

The volatile constituents of the scent gland reservoir of the fruit-spotting bug, Amblypelta nitida

1972 ◽  
Vol 25 (2) ◽  
pp. 393 ◽  
Author(s):  
JT Baker ◽  
JD Blake ◽  
JK Macleod ◽  
DA Ironside ◽  
IC Johnson
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Aldol Condensation ◽  
Specific Interest ◽  
Scent Gland ◽  
Volatile Constituents ◽  
Dehydration Product

Using combined gas chromatography and mass spectrometry, ten components of the scent-gland complex of the coreoid Amblypelta nitida Stal have been identified. Of specific interest is the presence in the gland reservoir of 2-n-butyloct-2-enal, the aldol condensation-dehydration product of hexanal.

New Antibiotic Sch 725424 and Its Dehydration Product Sch 725428 from Kitasatospora sp.

ChemInform ◽  
2005 ◽  
Vol 36 (39) ◽  
Author(s):  
Shu-Wei Yang ◽  
Tze-Ming Chan ◽  
Joseph Terracciano ◽  
Reena Patel ◽  
David Loebenberg ◽  
...  
Keyword(s):  
Dehydration Product

ChemInform Abstract: CHLORAL URETHAN AND ITS DEHYDRATION PRODUCT

1973 ◽  
Vol 4 (43) ◽  
pp. no-no
Author(s):  
J. AMOS ◽  
G. H. COOPER
Keyword(s):  
Dehydration Product

scholarly journals Elucidation of the Structure and Vibrational Spectroscopy of Synthetic Metaschoepite and Its Dehydration Product

2019 ◽  
Vol 58 (11) ◽  
pp. 7310-7323 ◽  
Author(s):  
Marie C. Kirkegaard ◽  
J. L. Niedziela ◽  
Andrew Miskowiec ◽  
Ashley E. Shields ◽  
Brian B. Anderson
Keyword(s):  
Vibrational Spectroscopy ◽  
Dehydration Product

Pigments of marine animals. X. Substituted naphthopyrones from the crinoid Comantheria perplexa

1970 ◽  
Vol 23 (11) ◽  
pp. 2325 ◽  
Author(s):  
RA Kent ◽  
IR Smith ◽  
MD Sutherland
Keyword(s):  
Acid Hydrolysis ◽  
Dimethyl Ether ◽  
Sodium Salt ◽  
Crude Extract ◽  
Synthetic Activity ◽  
Marine Animals ◽  
Dehydration Product ◽  
Aromatic Polyketides ◽  
Stalked Crinoids ◽  
Hydrolysis Of

Acetone extraction of the flesh of the comatulid crinoid Comantheria perplexa (H. L. Clark) yields a mixture of substances from which the sodium salt of the sulphuric ester (12) of 8-hydroxy-5,6-dimethoxy-2-methyl-4H-naphtho[2,3-b]pyran-4-one (8) has been isolated. Acid hydrolysis of (12) yields the phenol (8) which on methylation is converted into rubrofusarin dimethyl ether and on partial demethylation yields a product identical with a dehydration product (10) of fonsecin. Hydrolysis of the crude extract from C. perplexa yields (8), (10), and 8-hydroxy-5,6-dimethoxy-2-n-propyl-4H-naphtho[2,3-b]pyran-4-one (13). The structures of the isolated substances suggest a polyketide-type synthetic activity by this species. The stalked crinoids Endoxocrinus parrae (Gervais) and Neocrinus decorus (Wyville Thomson) yield negligible quantities of aromatic polyketides.

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