New cadinane sesquiterpenoids from the basidiomycetous fungus Pholiota sp.

RSC Advances ◽  
2016 ◽  
Vol 6 (113) ◽  
pp. 112527-112533 ◽  
Author(s):  
Jie Lin ◽  
Renlei Wang ◽  
Guohua Xu ◽  
Zhengfeng Ding ◽  
Xueshen Zhu ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
X Ray Diffraction ◽  
Electronic Circular Dichroism ◽  
X Ray ◽  
Basidiomycetous Fungus ◽  
The Absolute ◽  
Circular Dichroïsm

The basidiomycetous fungus Pholiota sp. produced five new cadinane sesquiterpenoids pholiotins A–E (1–5). The absolute configurations were determined by X-ray diffraction, the Snatzke's method and electronic circular dichroism (ECD) calculations.

Nine sesquiterpenoid dimers with four unprecedented types of carbon skeletons from Chloranthus henryi var. hupehensis

2021 ◽  
Author(s):  
Danyang Zhang ◽  
Xiao-Xia Wang ◽  
Ya-Nan Wang ◽  
Min Wang ◽  
Peng-Yu Zhuang ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Circular Dichroism ◽  
Magnetic Resonance ◽  
Diffraction Analysis ◽  
X Ray Diffraction ◽  
Electronic Circular Dichroism ◽  
X Ray ◽  
Circular Dichroïsm ◽  
Nuclear Magnetic

Chlorahupetones A-I (1−9), nine sesquiterpenoid dimers, were isolated from Chloranthus henryi var. hupehensis. Their structures were characterized by nuclear magnetic resonance (NMR), electronic circular dichroism (ECD), and X-ray diffraction analysis....

scholarly journals Absolute configuration of the antimalarial erythro-mefloquine – vibrational circular dichroism and X-ray diffraction studies of mefloquine and its thiourea derivative

RSC Advances ◽  
2016 ◽  
Vol 6 (85) ◽  
pp. 81461-81465 ◽  
Author(s):  
M. Kohout ◽  
J. Vandenbussche ◽  
A. Roller ◽  
J. Tůma ◽  
J. Bogaerts ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Absolute Configuration ◽  
Circular Dichroism Spectroscopy ◽  
Vibrational Circular Dichroism ◽  
X Ray Diffraction ◽  
Thiourea Derivative ◽  
X Ray ◽  
The Absolute ◽  
Circular Dichroïsm

The long-standing discussion of the absolute configuration of erythro-mefloquine is revisited, showcasing the strength of a combination of experimental and calculated vibrational circular dichroism spectroscopy.

Vibrational circular dichroism and single crystal X-Ray diffraction analyses of [Ir(bzq)2(phen)]+ (bzq = benzo[h]quinoline; phen = 1,10-phenanthroline): absolute configuration and role of CH–π interaction in molecular packing

2017 ◽  
Vol 46 (13) ◽  
pp. 4397-4402 ◽  
Author(s):  
Kazuyoshi Takimoto ◽  
Yutaka Watanabe ◽  
Shigeki Mori ◽  
Hisako Sato
Keyword(s):  
Circular Dichroism ◽  
Single Crystal ◽  
Absolute Configuration ◽  
Molecular Packing ◽  
Vibrational Circular Dichroism ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Absolute ◽  
Circular Dichroïsm

The absolute configuration of a cationic iridium(iii) complex was determined in solution and solid by vibrational circular dichroism and X-ray diffraction analyses.

Crystal structure of aristoserratine

1983 ◽  
Vol 36 (5) ◽  
pp. 1037 ◽  
Author(s):  
IRC Bick ◽  
MA Hai ◽  
VA Patrick ◽  
AH White
Keyword(s):  
Crystal Structure ◽  
Circular Dichroism ◽  
Single Crystal ◽  
Absolute Configuration ◽  
Circular Dichroism Spectrum ◽  
X Ray Diffraction ◽  
Relative Configuration ◽  
X Ray ◽  
The Absolute ◽  
Circular Dichroïsm

The crystal structure of the alkaloid aristoserratine,* C20H24N2O, has been determined by single-crystal X-ray diffraction methods at 295 K, the structure being refined to a residual of 0.034 for 1107 independent 'observed' reflections. Crystals are monoclinic, P21, a 14.836(5), b 8.568(3), c 6.633(3) �, β 98.05(3)�, Z 2. The relative configuration is established and, by inference, by comparison of the circular dichroism spectrum with that of aristoteline, the absolute configuration is assigned.

scholarly journals Absolute Configuration Sensing of Chiral Aryl- and Aryloxy-Propionic Acids by Biphenyl Chiroptical Probes

Chemosensors ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 154
Author(s):  
Stefania Vergura ◽  
Stefano Orlando ◽  
Patrizia Scafato ◽  
Sandra Belviso ◽  
Stefano Superchi
Keyword(s):  
Circular Dichroism ◽  
Absolute Configuration ◽  
Optical Rotation ◽  
Environmental Pollutants ◽  
Red Shift ◽  
Electronic Circular Dichroism ◽  
Configuration Assignment ◽  
Clear Sign ◽  
The Absolute ◽  
Circular Dichroïsm

The absolute configuration of chiral 2-aryl and 2-aryloxy propionic acids, which are among the most common chiral environmental pollutants, has been readily and reliably established by either electronic circular dichroism spectroscopy or optical rotation measurements employing suitably designed 4,4′-disubstituted biphenyl probes. In fact, the 4,4′-biphenyl substitution gives rise to a red shift of the diagnostic electronic circular dichroism signal of the biphenyl A band employed for the configuration assignment, removing its overlap with other interfering dichroic bands and allowing its clear sign identification. The largest A band red shift, and thus the most reliable results, are obtained by employing as a probe the 4,4′-dinitro substituted biphenylazepine 3c. The method was applied to the absolute configuration assignment of 2-arylpropionic acids ibuprofen (1a), naproxen (1b), ketoprofen (1c) and flurbiprofen (1d), as well as to the 2-aryloxypropionic acids 2-phenoxypropionic acid (2a) and 2-naphthoxypropionic acid (2b). This approach, allowing us to reveal the sample’s absolute configuration by simple optical rotation measurements, is potentially applicable to online analyses of both the enantiomeric composition and absolute configuration of these chiral pollutants.

Spectroscopic characterizations, X-ray studies, and electronic circular dichroism calculations of two alkaloid triterpenoids

2011 ◽  
Vol 22 (6) ◽  
pp. 1241-1248 ◽  
Author(s):  
Xiao-Bing Wang ◽  
Yao Zhang ◽  
Jun-Song Wang ◽  
He-Quan Yao ◽  
Hong-Bin Sun ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Electronic Circular Dichroism ◽  
X Ray ◽  
Circular Dichroïsm

X-ray diffraction and magnetic circular dichroism study of the Fe edge of epitaxial permalloy/Ru/permalloy trilayer

2004 ◽  
Vol 345 (1-4) ◽  
pp. 213-216 ◽  
Author(s):  
Ming-Zhe Lin ◽  
Chih-Hao Lee ◽  
Kuan-Li Yu ◽  
J.C.A. Huang ◽  
W.C. Chen
Keyword(s):  
Circular Dichroism ◽  
Magnetic Circular Dichroism ◽  
X Ray Diffraction ◽  
X Ray ◽  
Circular Dichroïsm
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