scholarly journals Front Cover: Origin of Nb2 O5 Lewis Acid Catalysis for Activation of Carboxylic Acids in the Presence of a Hard Base (ChemPhysChem 21/2018)

ChemPhysChem ◽  
2018 ◽  
Vol 19 (21) ◽  
pp. 2804-2804
Author(s):  
Pussana Hirunsit ◽  
Takashi Toyao ◽  
S. M. A. Hakim Siddiki ◽  
Kenichi Shimizu ◽  
Masahiro Ehara
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Lewis Acid Catalysis ◽  
Front Cover

scholarly journals Origin of Nb2 O5 Lewis Acid Catalysis for Activation of Carboxylic Acids in the Presence of a Hard Base

ChemPhysChem ◽  
2018 ◽  
Vol 19 (21) ◽  
pp. 2848-2857 ◽  
Author(s):  
Pussana Hirunsit ◽  
Takashi Toyao ◽  
S. M. A. Hakim Siddiki ◽  
Kenichi Shimizu ◽  
Masahiro Ehara
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Lewis Acid Catalysis

scholarly journals Origin of Nb2 O5 Lewis Acid Catalysis for Activation of Carboxylic Acids in the Presence of a Hard Base

ChemPhysChem ◽  
2018 ◽  
Vol 19 (21) ◽  
pp. 2809-2809
Author(s):  
Pussana Hirunsit ◽  
Takashi Toyao ◽  
S. M. A. Hakim Siddiki ◽  
Ken-ichi Shimizu ◽  
Masahiro Ehara
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Lewis Acid Catalysis

Introducing the Staudinger phosphazene reaction to porphyrin chemistry

2004 ◽  
Vol 08 (12) ◽  
pp. 1356-1365 ◽  
Author(s):  
Nga Hoang Huyen ◽  
Ulrike Jannsen ◽  
Hanaa Mansour ◽  
Norbert Jux
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Lewis Acid Catalysis ◽  
Subsequent Reaction ◽  
Nucleophilic Reaction ◽  
Azide Anion ◽  
Kornblum Oxidation

The syntheses, characterizations and transformations of three tetraphenylporphyrins derived from methoxymethylated benzaldehyde 3 are described. Benzaldehyde 3 reacted with pyrrole under Lewis acid catalysis to give dipyrromethane 4 which was used as precursor in porphyrin syntheses. Porphyrins 6, αα-7 and αβ-7 were obtained using conditions for sterically encumbered benzaldehydes, with αα-7 and αβ-7 being atropisomers. The methoxymethyl groups of 6, αα-7 and αβ-7 were transformed into bromomethyl substituents (porphyrins 8, αα-9 and αβ-9) which were easily modified by nucleophilic reaction with the azide anion. Porphyrin azide 10 was subjected to a Staudinger phosphazene formation with triphenylphosphine. Subsequent reaction of the porphyrin phosphazene 12 with carboxylic acids gave acetamide 13, benzamide 14, and ferrocene carboxamide 15, respectively. Kornblum oxidation of monobromomethyl porphyrin 8 gave the formyl derivative 16.

scholarly journals Carboxamides from Carboxylic Acids by Lewis Acid Catalysis. Use of Principal Properties for Exploring Different Reaction Conditions.

1988 ◽  
Vol 42b ◽  
pp. 28-34 ◽  
Author(s):  
Åke Nordahl ◽  
Rolf Carlson ◽  
Christian Rømming ◽  
Lars Skattebøl ◽  
Arto Karjalainen ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Lewis Acid Catalysis ◽  
Reaction Conditions

Chiral Lewis Acid Catalysis in Nitrile Oxide Cycloadditions

2004 ◽  
Vol 126 (17) ◽  
pp. 5366-5367 ◽  
Author(s):  
Mukund P. Sibi ◽  
Kennosuke Itoh ◽  
Craig P. Jasperse
Keyword(s):  
Lewis Acid ◽  
Acid Catalysis ◽  
Nitrile Oxide ◽  
Lewis Acid Catalysis ◽  
Chiral Lewis Acid

Lewis Acid Catalysis with Cationic Dinuclear Gold(II,II) and Gold(III,III) Phosphorus Ylide Complexes

2016 ◽  
Vol 35 (17) ◽  
pp. 2830-2835 ◽  
Author(s):  
Benjamin R. Reiner ◽  
Mark W. Bezpalko ◽  
Bruce M. Foxman ◽  
Casey R. Wade
Keyword(s):  
Lewis Acid ◽  
Acid Catalysis ◽  
Lewis Acid Catalysis ◽  
Phosphorus Ylide ◽  
Ylide Complexes
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