Stereoselective Synthesis of Functionalized Triol Units by SnCl4 Promoted Allylation of α-Benzyloxyaldehydes: Crucial Role of the Stoichiometry of the Lewis Acid.

ChemInform ◽  
2004 ◽  
Vol 35 (49) ◽  
Author(s):  
Christophe Dubost ◽  
Bernard Leroy ◽  
Istvan E. Marko ◽  
Bernard Tinant ◽  
Jean-Paul Declercq ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Crucial Role ◽  
Stereoselective Synthesis

Stereoselective synthesis of functionalised triol units by SnCl4 promoted allylation of α-benzyloxyaldehydes: crucial role of the stoichiometry of the Lewis acid

Tetrahedron ◽  
2004 ◽  
Vol 60 (35) ◽  
pp. 7693-7704 ◽  
Author(s):  
Christophe Dubost ◽  
Bernard Leroy ◽  
Istvan E. Markó ◽  
Bernard Tinant ◽  
Jean-Paul Declercq ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Crucial Role ◽  
Stereoselective Synthesis

The effect of auxiliary ligand on the mechanism and reactivity: DFT study on H2 activation by Lewis acid–transition metal complex (tris(phosphino)borane)Fe(L)

2017 ◽  
Vol 7 (20) ◽  
pp. 4866-4878 ◽  
Author(s):  
Jianyu Zhang ◽  
Jiasheng Lin ◽  
Yinwu Li ◽  
Youxiang Shao ◽  
Xiao Huang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Complex ◽  
Lewis Acid ◽  
Crucial Role ◽  
Transition Metal Complex ◽  
Dft Study ◽  
Dft Studies ◽  
Auxiliary Ligand ◽  
Hydrogen Activation

The crucial role of the auxiliary ligand in hydrogen activation is revealed by DFT studies for the LA–TM ferraboratrane complex.

ChemInform Abstract: Crucial Role of the Ligand of Silyl Lewis Acid in the Mukaiyama Aldol Reaction.

ChemInform ◽  
2010 ◽  
Vol 33 (47) ◽  
pp. no-no
Author(s):  
Kazuaki Ishihara ◽  
Yukihiro Hiraiwa ◽  
Hisashi Yamamoto
Keyword(s):  
Lewis Acid ◽  
Crucial Role ◽  
Aldol Reaction ◽  
Mukaiyama Aldol Reaction ◽  
Mukaiyama Aldol

Crucial Role of the Conjugate Base for Silyl Lewis Acid Induced Mukaiyama Aldol Reactions

2006 ◽  
Vol 2006 (8) ◽  
pp. 1837-1844 ◽  
Author(s):  
Yukihiro Hiraiwa ◽  
Kazuaki Ishihara ◽  
Hisashi Yamamoto
Keyword(s):  
Lewis Acid ◽  
Crucial Role ◽  
Aldol Reactions ◽  
Mukaiyama Aldol ◽  
Conjugate Base

scholarly journals Different reactivity of phosphorylallenes under the action of Brønsted or Lewis acids: a crucial role of involvement of the P=O group in intra- or intermolecular interactions at the formation of cationic intermediates

2019 ◽  
Vol 15 ◽  
pp. 1491-1504
Author(s):  
Stanislav V Lozovskiy ◽  
Alexander Yu Ivanov ◽  
Aleksander V Vasilyev
Keyword(s):  
Nmr Spectroscopy ◽  
Lewis Acid ◽  
Crucial Role ◽  
Lewis Acids ◽  
Phosphonic Acids ◽  
Phosphorus Containing ◽  
Allyl Alcohols ◽  
Hydrolysis Of ◽  
Allene System

3-Methylbuta-1,2-dien-1-ylphosphonic acid derivatives (phosphorylallenes) [X2(O=)P–CR=C=CMe2, X = Cl, OMe, NR2, or SAr] undergo intramolecular cyclization into the corresponding 1,2-oxaphospholium ions in the Brønsted superacid TfOH. These cations have been thoroughly studied by means of NMR spectroscopy. The hydrolysis of superacidic solutions of these species afforded cyclic phosphonic acids and other phosphorus-containing compounds. Contrary to Brønsted acids, 3-methylbuta-1,2-dien-1-ylphosphonic dichloride [Cl2(O=)P–HC=C=CMe2] reacted with the Lewis acid AlCl3 in an intermolecular way forming noncyclic intermediates, which were investigated by NMR spectroscopy and DFT calculations. Hydrolysis of these species resulted in the formation of phosphoryl-substituted allyl alcohols and 1,3-butadienes. A strong coordination of the oxygen of the P=O group with AlCl3 prevented the formation of cyclic 1,2-oxaphospholium ions and played a crucial role in the different reactivity of such phosphorylallenes under the action of Brønsted or Lewis acids. Apart from that, the reaction of dichlorophosphorylallenes with arenes and AlCl3 led to products of hydroarylation of the allene system, phosphoryl-substituted alkenes and/or indanes. This is the first example of a Lewis acid-promoted intermolecular hydroarylation of allenes bearing electron-withdrawing substituents. Plausible reaction mechanisms have been proposed on the basis of the investigated reactions, and NMR analysis and DFT studies of the intermediate cationic species.

Epitaxial YBa2Cu3O7-8 films : Crucial role of growth-induced linear defects in microwave properties

2001 ◽  
Vol 11 (PR11) ◽  
pp. Pr11-47-Pr11-52
Author(s):  
V. M. Pan ◽  
V. S. Flis ◽  
V. A. Komashko ◽  
O. G. Plys ◽  
C. G. Tretiatchenko ◽  
...  
Keyword(s):  
Crucial Role ◽  
Microwave Properties ◽  
Linear Defects
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