Results 291 to 300 of about 36,653 (344)

An unexpected stereoisomerism in enantiomerically pure trisadducts of C60 with an inherently chiral trans-3,trans-3,trans-3 addition pattern.

Chemical Communications, 2014
We have synthesized and isolated two C2-symmetric enantiomerically pure trisadducts of C60 with an inherently chiral trans-3,trans-3,trans-3 addition pattern with the aid of an enantiopure cyclo-tris-malonate tether.
Maria Riala, N. Chronakis
semanticscholar   +1 more source

Sequence stereoisomerism in calixarene-based pseudo[3]rotaxanes.

Organic Letters, 2011
Two calix[6]arene directional wheels can be ordered in the right stereosequence by their through-the-annulus threading with a rationally designed bis(benzylalkylammonium) axle.
Carmen Talotta, C. Gaeta, T. Pierro, P. Neri   +3 more
semanticscholar   +1 more source

Organic Stereochemistry. Part 2. Stereoisomerism Resulting from One or Several Stereogenic Centers

, 2013
With this second review, our Work on organic stereochemistry continues with that most important of stereogenic elements, namely the stereogenic center, as found in a majority of stereoisomers.
B. Testa
semanticscholar   +1 more source

Stereoisomere trihalogenotricarbonylosmate(II)

Journal of Organometallic Chemistry, 1976
Abstract Mononuclear cis -dicarbonyls of divalent osmium react in suitable organic solvents with CO to produce at 20°C mer -[OsX 3 (CO) 3 ] − and at above 100°C fac -[OsX 3 (CO) 3 ] − (X = Cl, Br, I). The bands of the IR and Raman spectra are assigned on the basis of their relative intensities.
W. Preetz, F.H. Johannsen
openaire   +2 more sources

Controlling dynamic stereoisomerism in transition-metal folded baskets

, 2011
We synthesized chiral molecular baskets (R3/S3)-1, containing three pyridine rings at the rim of a bowl-shaped platform. Each pyridine was tethered to the platform via a CH(CH)3 stereogenic center. In line with prior studies, we found that chiral basket (
S. Stojanović, Daniel A. Turner, C. Hadad, J. Badjić   +3 more
semanticscholar   +1 more source

Temperature-dependent supramolecular stereoisomerism in porous copper coordination networks based on a designed carboxylate ligand.

Chemical Communications, 2005
Two novel temperature-controlled supramolecular stereoisomers of porous copper coordination networks have been synthesized and characterized.
Daofeng Sun, Yanxiong Ke, T. M. Mattox, Betty A Ooro, Hongcai Zhou   +4 more
semanticscholar   +1 more source

Stereoisomerism in polyoxometalates: structural and spectroscopic studies of bis(malate)-functionalized cluster systems.

Chemical Communications, 2005
The tetrameric macrocycle [(P(mu-NtBu))2(1,4-(NH)2C6H4)]4, obtained from the reaction of the phosphazane dimer [ClP(mu-NtBu)]2 with p-phenylenediamine, has an unusual folded conformation in the solid state and contains a roughly tetrahedral arrangement ...
X. Fang, T. Anderson, Yu Hou, C. Hill
semanticscholar   +1 more source

ChemInform Abstract: Synthesis of Stereoisomeric Ufolanes.

ChemInform, 1992
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Rolf-Stefan Trog, Peter G. Jones, D. Doering, E. Arensmann, H. Tendler, Peter Boldt, Martin Blenkle, H. Kersten   +7 more
openaire   +3 more sources

Stereochemistry and Stereoisomerism Characterized by the Sphericity Concept

, 2001
The sphericity concept proposed for specifying stereochemistry in a molecule (S. Fujita, J. Am. Chem. Soc., 112, 3390 (1990)) has been extended to investigate stereoisomerism among molecules.
S. Fujita
semanticscholar   +1 more source

Stereoisomerism and Biological Activity of the Selective and Superactive αvβ3 Integrin Inhibitor cyclo(-RGDfV-) and Its Retro-Inverso Peptide

, 1997
The cyclic pentapeptide cyclo(-Arg-Gly-Asp-d-Phe-Val-) is a highly potent and selective inhibitor for the αvβ3 integrin and is a prospective anticancer drug by acting to inhibit angiogenesis and by...
J. Wermuth, S. Goodman, A. Jończyk*, H. Kessler   +3 more
semanticscholar   +1 more source