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Chiral Bis (chiral + bis)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

A C2 -Chiral Bis(amidinium) Catalyst for a Diels,Alder Reaction Constituting the Key Step of the Quinkert,Dane Estrone Synthesis

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 9 2003
Svetlana B. Tsogoeva
Abstract A novel C2 -chiral bis(amidinium) salt 12 has been synthesised from 5-(tert -butyl)isophthalic acid. The hydrogen-bond-mediated association of dienophiles 3a and 3b with the chiral host molecule 12 accelerates the Diels,Alder reactions with diene 2 by more than three orders of magnitude. In addition, enantioselective formation of the desired adducts is observed under catalysis with 12. Good ratios of 4a(b) + ent - 4a(b)/5a(b) + ent - 5a(b) from 1:10 to 1:22 were found in all reactions. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003) [source]

ChemInform Abstract: Chiral Bis(imidazolidine)pyridine,Cu(OTf)2: Catalytic Asymmetric Endo-Selective [3 + 2] Cycloaddition of Imino Esters with Nitroalkenes.

CHEMINFORM, Issue 34 2010
Takayoshi Arai
Abstract A new bis(imidazolidine)pyridine ligand is easily synthesized in a single condensation of 2,6-pyridyl bisaldehyde and optically active diphenylethylenediamine. [source]

New Chiral Bis(diphenylphospholane) Ligands: Design, Synthesis, and Application to Catalytic Enantioselective Aldol Reaction to Ketones.

CHEMINFORM, Issue 40 2005
Kounosuke Oisaki
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Asymmetric Hydrosilylation of Alkenes with Alkoxyhydrosilanes Catalyzed by Chiral Bis(oxazolinyl)phenyl,Rhodium Complex.

CHEMINFORM, Issue 8 2005
Yasunori Tsuchiya
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Synthesis of Novel C2 -Symmetric Chiral Bis(oxazoline) Ligands and their Application in the Enantioselective Addition of Diethylzinc to Aldehydes.

CHEMINFORM, Issue 22 2004
Bin Fu
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

ChemInform Abstract: Chiral Bis(trialkylsiloxymethyloxazolinyl)pyridine Ligands.

CHEMINFORM, Issue 26 2002
3-Dipolar Cycloaddition Reactions., Highly Enantioselective
Abstract ChemInform 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. [source]

ChemInform Abstract: Novel Terpene-Based Chiral Bis-,-aminooximes and the Corresponding Macrocycles: X-Ray Structure of a Ring-Fused 5,7-Dioxa-1,4,8,11-tetraazacyclotrideca-3,8-diene Derivative.

CHEMINFORM, Issue 18 2001
Pavel A. Petukhov
Abstract ChemInform 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. [source]

Catalytic and Highly Enantioselective Reactions of ,-Sulfonyl Carbanions with Chiral Bis(oxazoline)s

CHEMISTRY - A EUROPEAN JOURNAL, Issue 18 2008
Shuichi Nakamura Prof.
Abstract The enantioselective reactions of lithiated benzyl trifluoromethyl sulfones with a substoichiometric amount of a bis(oxazoline) and various aldehydes is disclosed. The products were formed with excellent diastereo- and enantioselectivities. Fluorination of the sulfone with N -fluorobenzenesulfonimide and a stoichiometric amount of a bis(oxazoline) gave products with extremely high enantioselectivities (up to 99,%,ee; ee=enantiomeric excess). The enantioselective reaction was confirmed to proceed through a dynamic thermodynamic resolution pathway. [source]