Sn(OTf)2 as an Effective Lewis Acid in Reactions of Cyclopropyl Ketones with Acetic Anhydride: Application in the Synthesis of a 19-Nor-B-homo Steroid

2011 ◽  
Vol 2011 (15) ◽  
pp. 2860-2866 ◽  
Author(s):  
Darius Paul Kranz ◽  
Aike Meier zu Greffen ◽  
Sherif El Sheikh ◽  
Jörg Martin Neudörfl ◽  
Hans-Günther Schmalz
Keyword(s):  
Acetic Anhydride ◽  
Lewis Acid ◽  
Cyclopropyl Ketones

Lewis acid catalysed asymmetric cascade reaction of cyclopropyl ketones: concise synthesis of pyrrolobenzothiazoles

2020 ◽  
Vol 56 (87) ◽  
pp. 13429-13432 ◽  
Author(s):  
Fenzhen Chang ◽  
Bin Shen ◽  
Sijing Wang ◽  
Lili Lin ◽  
Xiaoming Feng
Keyword(s):  
Lewis Acid ◽  
Cascade Reaction ◽  
Complex Catalyst ◽  
Cyclopropyl Ketones

A concise method to synthesize pyrrolobenzothiazoles via a cascade reaction of cyclopropyl ketones was developed by using a chiral N,N′-dioxide-scandium(iii) complex catalyst.

scholarly journals Friedel-crafts acylation of aromatic compounds using Triflat bismuth

2014 ◽  
Vol 17 (2) ◽  
pp. 10-14
Author(s):  
Phuong Hoang Tran ◽  
Thanh Duy Anh Nguyen ◽  
Thach Ngoc Le
Keyword(s):  
Reaction Time ◽  
Acetic Anhydride ◽  
Lewis Acid ◽  
Aromatic Compounds ◽  
Good Yield ◽  
Efficient Catalyst ◽  
Short Reaction Time ◽  
Mild Conditions ◽  
Bismuth Triflate ◽  
Work Up

Friedel-Crafts acylation of aromatic compounds with acetic anhydride as acylating reagent was investigated in the presence of Lewis acid. Bismuth trifluoromethanesulfonate was found to be efficient catalyst for Friedel-Crafts acetylation under mild conditions. Bismuth triflate is safe-to-handle, simple and clean work-up, good yield and short reaction time

scholarly journals A General Protocol for Radical Anion [3+2] Cycloaddition Enabled by Tandem Lewis Acid Photoredox Catalysis

Synthesis ◽  
2017 ◽  
Vol 50 (03) ◽  
pp. 539-547 ◽  
Author(s):  
Tehshik Yoon ◽  
Adrian Amador ◽  
Evan Sherbrook ◽  
Zhan Lu
Keyword(s):  
Redox Potential ◽  
Lewis Acid ◽  
Radical Anion ◽  
Photoredox Catalysis ◽  
Critical Factors ◽  
Radical Intermediate ◽  
Cyclopropyl Ketone ◽  
Cyclopropyl Ketones

A method for intermolecular [3+2] cycloaddition between aryl cyclopropyl ketones and alkenes involving the combination of Lewis acid and photoredox catalysis is reported. In contrast to other more common methods for [3+2] cycloaddition, these conditions operate using a broad range of both electron-rich and electron-deficient reaction partners. The critical factors predicting the success of these reactions is the redox potential of the cyclopropyl ketone and the ability of the alkene to stabilize a key radical intermediate.

DETERMINATION OF ALDOSTERONE AND DEOXYCORTICOSTERONE IN PLASMA USING 3H-ACETIC ANHYDRIDE AND VAPOUR PHASE ACETYLATION

1969 ◽  
Vol 61 (1_Suppl) ◽  
pp. S12 ◽  
Author(s):  
V. H. T. James ◽  
A. E. Rippon ◽  
M. L. Arnold
Keyword(s):  
Acetic Anhydride ◽  
Vapour Phase
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