Home  About us  Contact
 

Pinacol Coupling (pinacol + coupling)

Distribution by Scientific Domains
Chemistry100%

Selected Abstracts

Divalent Samarium Triflate Mediated Stereoselective Pinacol Coupling of Planar Chiral Phosphanyl and Phosphoryl Ferrocenecarbaldehyde

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY, Issue 5 2009
Shin-ichi Fukuzawa
Abstract The pinacol coupling reaction of (Rp)-2-diphenylphosphanyl ferrocenecarbaldehyde (1) was smoothly mediated by divalent samarium triflate to give (R,R)-diol 2a predominantly, whereas the use of samarium(II) iodide resulted in low selectivity as described in the previous literature. In contrast, the coupling reaction of (Rp)-2-diphenylphosphoryl ferrocenecarbaldehyde (3) with Sm(OTf)2 gave the (S,S)-diol as the major isomer, which was the opposite stereochemistry of that obtained in the reaction with 1. The rhodium complexes of diphosphanes 2a were good catalysts for the asymmetric hydrogenation of ,-acetamidocinnamic acid, and the product was obtained quantitatively with up to 92,%,ee. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009) [source]

Pinacol Coupling of Aromatic Aldehydes and Ketones Mediated by TiCl4,Zn in Ethyl Acetate under Ultrasound.

CHEMINFORM, Issue 50 2007
Ji-Tai Li
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

Studies on the Lanthanum-Induced Pinacol Coupling of Aromatic Aldehydes and Ketones in Aqueous Media.

CHEMINFORM, Issue 7 2007
Yan-Jiang Bian
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source]

Pinacol Coupling of Aromatic Aldehydes and Ketones Using TiCl3,Al,EtOH under Ultrasound Irradiation.

CHEMINFORM, Issue 18 2005
Ji-Tai Li
No abstract is available for this article. [source]

Mg-Promoted Mixed Pinacol Coupling.

CHEMINFORM, Issue 34 2004
Hirofumi Maekawa
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

Samarium(II)-Mediated Pinacol Coupling in Water: Occurrence of Unexpected Disproportionation and Action of Low-Valent Samarium as an Active Species.

CHEMINFORM, Issue 32 2003
Satoru Matsukawa
Abstract For Abstract see ChemInform Abstract in Full Text. [source]

ChemInform Abstract: Pinacol Coupling of Aromatic Aldehydes and Ketones Using Zn,ZnCl2 under Ultrasound.

CHEMINFORM, Issue 37 2002
Hong-Jun Zang
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]

Reduction and Coupling Reaction of Carbonyl Compounds by Aluminum Powder and a Small Amount of Oxalic Acid in Water

CHINESE JOURNAL OF CHEMISTRY, Issue 1 2006
Shi-Zhen Yuan
Abstract A convenient pinacol coupling of aromatic aldehydes and aryl methyl ketones has been achieved with high yields by aluminum powder in the presence of oxalic acid in water. However, the diastereoselectivities of pinacols were not satisfying, and most aliphatic aldehydes and diaryl ketones have been found to be unreactive under the same conditions. [source]

Asymmetric pinacol coupling of aromatic aldehydes catalyzed by TiCl4(THF)2 -Zn/chiral diamines

CHINESE JOURNAL OF CHEMISTRY, Issue 10 2003
You-Gui Li
Abstract Asymmetric pinacol coupling of aromatic aldehydes catalyzed by chiral diamines/low-valent titanium complexes gave corresponding pinacols in good yields with high diastereoselectivity and moderate enantioselectivities. [source]

Coupling reaction of carbonyl compounds mediated by gallium metal in aqueous media

CHINESE JOURNAL OF CHEMISTRY, Issue 9 2003
Zhi-Yong Wang
Abstract A simple and effective pinacol coupling of various aromatic aldehydes mediated by gallium in good yields has been carried out. The reaction is highly effective in water in the presence of KOH or HCl and was strongly affected by the steric environment surrounding the carbonyl group. Aliphatic aldehydes, ketones and aromatic ketones appear inert under the same reaction conditions. [source]