Results 261 to 270 of about 104,486 (292)
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Synthesis and Structural Revision of Symbiodinolide C23−C34 Fragment
The Journal of Organic Chemistry, 2009Stereoselective synthesis of the C23-C34 fragment of symbiodinolide, which possesses the originally proposed stereochemistry, and its diastereomers was achieved in 19 steps from L-aspartic acid, respectively. Comparison of spectroscopic data of the synthetic products with those of the degraded product of symbiodinolide led to a structural revision of ...
Takeshi, Murata +4 more
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Synthesis of the C1−C23 Fragment of Spirastrellolide A
Organic Letters, 2008Synthesis of the C1-C23 fragment in spirastrellolide A is described, featuring a cyclic acetal-tethered RCM for stereoselective constructions of spiroketal, and a 1,3- anti aldol involving methyl ketone enolate and Mukaiyama conditions.
Jin-Haek, Yang +2 more
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Association of protein C23 with rapidly labeled nucleolar RNA
Biochemistry, 1986The association of nucleolar phosphoprotein C23 with preribosomal ribonucleoprotein (RNP) particles was examined in Novikoff hepatoma nucleoli. RNA was labeled with [3H]uridine for various times in cell suspensions, and RNP particles were extracted from isolated nucleoli and fractionated by sucrose gradient ultracentrifugation.
A H, Herrera, M O, Olson
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Localization of nucleolar phosphoproteins B23 and C23 during mitosis
Experimental Cell Research, 1983Nucleolar phosphoproteins B23 and C23 were simultaneously localized in unsynchronized male rat-kangaroo PtK2 cells during mitosis using a mouse monoclonal antibody against protein B23 and a rabbit antibody against protein C23. The distribution of proteins B23 and C23 during mitosis was compared with the distribution of the silver staining protein ...
R, Ochs +3 more
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Chemoenzymatic Synthesis of the C10−C23 Segment of Dictyostatin
Organic Letters, 2006[reaction: see text] Employing enzymatic desymmetrization and resolution, respectively, the two aldehydes 8 and 20 were prepared. The precursor to aldehyde 8, meso-2,4-dimethylglutaric anhydride 3, could be obtained by base treatment of the diastereomeric mixture. Aldehyde 8 was extended to alkyne 10 by a Marshall reaction introducing four carbon atoms.
Evgeny, Prusov +2 more
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Synthesis of the C23–C32 fragment of spirangien
Tetrahedron Letters, 2007Abstract The synthesis of the C23–C32 fragment of spirangien A is reported using Evans’ alkylation, Evans–Metternich aldol reaction and a substrate controlled stereoselective reduction.
Michael Lorenz, Markus Kalesse
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Simulation of multiple ordered phases in C23 n-alkane
The Journal of Chemical Physics, 2011Normal alkanes display multiple ordered phases, including an orthorhombic crystal (X) and two partially ordered rotator phases (RI and RII). The rotator phase transitions X–RI and RI–RII are of interest because they are weakly first-order, and because experiments suggest that crystalline polyethylene may nucleate via a metastable rotator phase. We have
Nathaniel, Wentzel, Scott T, Milner
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A highly stereoselective synthesis of the C10–C23 fragment of (–)-dictyostatin
Chemical Communications, 2007A highly stereoselective synthesis of the C10-C23 fragment of (-)-dictyostatin has been achieved using a Carreira alkynylation and a Marshall-Tamaru allenylzinc addition as key steps.
C. Monti, O. Sharon, C. Gennari
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A C23-type Modification of ThAs2
Nature, 1966ThAs2 was reported to crystallize in the tetragonal Cu2Sb or C38 type of structure1. In an attempt to synthesize this phase by reacting arsenic with thorium powder at temperatures between 600° and 900° C, a new modification was obtained. This low-temperature form α-ThAs2 is orthorhombic and of the C23 type. Its lattice constants are:
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