Results 221 to 230 of about 19,814 (278)
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Organic Letters, 2015
The synthesis of five diastereomeric model compounds incorporating the C32-C46 segment of the antitumor marine natural product hemicalide has been achieved through a convergent approach relying on the 1,4-addition of an alkenyl boronate to an α,β ...
Simon Specklin +9 more
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The synthesis of five diastereomeric model compounds incorporating the C32-C46 segment of the antitumor marine natural product hemicalide has been achieved through a convergent approach relying on the 1,4-addition of an alkenyl boronate to an α,β ...
Simon Specklin +9 more
semanticscholar +1 more source
Environmental Science and Technology, 2002
Gas- and particle-phase organic compounds present in the tailpipe emissions from an in-use fleet of gasoline-powered automobiles and light-duty trucks were quantified using a two-stage dilution source sampling system. The vehicles were driven through the
J. Schauer +3 more
semanticscholar +1 more source
Gas- and particle-phase organic compounds present in the tailpipe emissions from an in-use fleet of gasoline-powered automobiles and light-duty trucks were quantified using a two-stage dilution source sampling system. The vehicles were driven through the
J. Schauer +3 more
semanticscholar +1 more source
A Stereoselective Synthesis of the C20-C32 Fragment of the Phorboxazoles
Synlett, 2007The C20-C32 fragment of the phorboxazoles was realized in a stereoconvergent manner utilizing a desymmetrization approach. This successful strategy involves epimerization and modified Julia olefination as key steps.
Jhillu S. Yadav +3 more
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Using Synthetic Controls: Feasibility, Data Requirements, and Methodological Aspects
Journal of Economic Literature, 2021Probably because of their interpretability and transparent nature, synthetic controls have become widely applied in empirical research in economics and the social sciences.
Alberto Abadie
semanticscholar +1 more source
Wallenone, a C32 triterpenoid from the leaves of Gyrinops walla
Phytochemistry, 1986Abstract Wallenone, a new C 32 tirucallane-type triterpene isolated from the leaves of Gyrinops walla , has been shown to be 24-methylene-25-methyltirucall-7-en-3-one through X-ray crystallographic analysis and 2D-NMR spectroscopy.
Philip J. Cox +3 more
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Theoretical study of metallofullerenes M@C32
Journal of Molecular Structure: THEOCHEM, 1998Abstract 14 systems of metal atoms, embedded inside the C 32 cage, have been calculated and analyzed using the ab initio quantum chemistry Gamess program. We study their electronic structure, compare their stability. The metal atom with even electrons interjected inside the C 32 cage is more stable than the metal atom with odd electrons.
Ying-Nan Chiu +5 more
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Structures of three C32 triterpenoids from Neolitsea pulchella
Journal of the Chemical Society C: Organic, 1971Three triterpenoids isolated from Neolitsea pulchella, have been proved by n.m.r. and mass spectral data, and chemical correlations with one another and with cycloneolitsin (3β-methoxy-24,24-dimethyl-9,19-cyclolanost-25-ene) to be 3β-methoxy-24,24-dimethyl-lanosta-9(11),25-diene (I), 24,24-dimethyl-lanosta-9(11),25-dien-3-one (II), and 24ξ-hydroxy-3β ...
S. N. Loo +3 more
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Abstract C32: The function of GPR56 in metastasis formation of melanoma
Cancer Research, 2016Abstract Disseminated cancer cells often persist in tissues for a long period before being manifested as clinically detectable metastases. This metastasis dormancy imposes a main threat for cancer patients, especially after their first line of cancer treatment.
Nancy Corson, Liquan Yang, Lei Xu
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Electronic structures and spectral characteristics of the six C32 fullerene isomers
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2019In this paper, the six C32 isomers which were of crucial importance in the manufacture of new electronic components were identified by X-ray photoelectron spectroscopy (XPS) and near-edge X-ray absorption fine structure (NEXAFS). For the discernment, geometry optimizations of the six isomers have been carried out, and the C1s XPS and NEXAFS spectra ...
Juan Lin +5 more
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Further C32 triterpenoids from Neolitsea pulchella
Journal of the Chemical Society, Perkin Transactions 1, 1973Three further C32 triterpenoids isolated from the stems of Neolitsea pulchella, have been shown to be 3β,24ξ-dimethoxy-24,25-dimethyl-lanost-9(11)-ene (I). 24ξ-methoxy-24,25-dimethyl-lanost-9(11)-en-3-one (II), and 24,24-dimethyl-lanosta-9(11),25-dien-3β-ol (III). Compounds (I) and (II) are new.
Wai-Haan Hui, Wai-Shing Chan
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