Stereoisomerism
Research News and Information

Sunday, November 22, 2009

Aza-beta3-cyclopeptides: a new way of controlling nitrogen chirality.

12 Oct 2009 Sixteen and 24 membered aza-beta(3)-peptidic macrocycles containing a alpha-hydrazinoacid or a beta(3)-aminoacid were synthesized. The conformation of these pseudopeptides was determined by using NH chemical shift analysis, NH extinction, VT-NMR ... Read more...

Stereoselective synthesis of gamma-substituted (Z)-allylic boranes via kinetically controlled hydroboration of allenes with 10-TMS-9-borabicyclo[3.3.2]decane.

12 Oct 2009 Kinetically controlled hydroboration of allenes 8 and 14a-d with the readily accessible Soderquist borane 7, which is generated in situ from borohydride 6, constitutes a convenient and preparatively useful method for synthesis of ... Read more...

Insertions of silylenes into vinyl epoxides: diastereoselective synthesis of functionalized, optically active trans-dioxasilacyclooctenes.

12 Oct 2009 This communication describes a direct route to functionalized nonracemic trans-dioxasilacyclooctenes that involves stereoselective silylene insertions into vinyl epoxides to provide vinyl silaoxetane intermediates. These strained allylic silanes ... Read more...

Latest indexed articles for 'Stereoisomerism'

These are the very latest articles for this heading:

• Aza-beta3-cyclopeptides: a new way of controlling nitrogen chirality. 12 Oct 2009
• Stereoselective synthesis of gamma-substituted (Z)-allylic boranes via kinetically controlled hydroboration of allenes with 10-TMS-9-borabicyclo[3.3.2]decane. 12 Oct 2009
• Insertions of silylenes into vinyl epoxides: diastereoselective synthesis of functionalized, optically active trans-dioxasilacyclooctenes. 12 Oct 2009
• Mimics of the self-assembling chlorosomal bacteriochlorophylls: regio- and stereoselective synthesis and stereoanalysis of acyl(1-hydroxyalkyl)porphyrins. 12 Oct 2009
• Formal [4 + 2] cycloaddition of donor-acceptor cyclobutanes and aldehydes: stereoselective access to substituted tetrahydropyrans. 12 Oct 2009
• Catalytic asymmetric synthesis of palmerolide A via organoboron methodology. 12 Oct 2009
• Resolution of planar chiral cationic (eta6-arene)tricarbonylmanganese complexes. 12 Oct 2009
• Development of a merged conjugate addition/oxidative coupling sequence. Application to the enantioselective total synthesis of metacycloprodigiosin and prodigiosin R1. 12 Oct 2009
• Optically active (aR)- and (aS)-linear and vaulted biaryl ligands: deracemization versus oxidative dimerization. 12 Oct 2009
• Synthesis of 1,1-[1-naphthyloxy-2-thiophenyl]-2-methylaminomethylcyclopropanes and their evaluation as inhibitors of serotonin, norepinephrine, and dopamine transporters. 6 Oct 2009
• Identification of Carboniferous (320 million years old) class Ic amber. 30 Sep 2009
• Paleontology. Pushing back amber production. 30 Sep 2009
• Sterically hindered phenols in negative ion mobility spectrometry-mass spectrometry. 29 Sep 2009
• Design, synthesis, and pharmacological activities of dynorphin A analogues cyclized by ring-closing metathesis. 22 Sep 2009
• D-amino acids govern stationary phase cell wall remodeling in bacteria. 16 Sep 2009
• Cell biology. Expanding functionality within the looking-glass universe. 16 Sep 2009
• Three-step, "one-pot" radiosynthesis of 6-fluoro-3,4-dihydroxy-L-phenylalanine by isotopic exchange. 14 Sep 2009
• Site-specific DNA structural and dynamic features revealed by nucleotide-independent nitroxide probes. 13 Sep 2009
• The phytohormone precursor OPDA is isomerized in the insect gut by a single, specific glutathione transferase. 6 Sep 2009
• 2,2'-Bipyrrolidine versus 1,2-diaminocyclohexane as chiral cores for helically wrapping diamine-diolate ligands. 5 Sep 2009

See a longer list of these articles.

Technical information about 'Stereoisomerism'

Definition: The phenomenon whereby compounds whose molecules have the same number and kind of atoms and the same atomic arrangement, but differ in their spatial relationships. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed)

Descriptor UI: D013237

Alternative terms: Stereoisomerism; Molecular Stereochemistry; Stereochemistry, Molecular; Stereoisomers; Stereoisomer;

Tree Number: G02.607.500.682;

History Note: 1997 (1968); for MOLECULAR STEREOCHEMISTRY use MOLECULAR CONFORMATION 1993-2008

Technical Notes: NIM; policy: Manual 25.5.5.1