Acid-catalyzed cyclization reactions. XI. Competitive amide versus thioamide cyclization. Cyclization of N-allylrhodanine in strong acid media

1974 ◽  
Vol 39 (20) ◽  
pp. 3041-3042 ◽  
Author(s):  
Samuel P. McManus ◽  
Kin Y. Lee
Keyword(s):  
Strong Acid ◽  
Cyclization Reactions ◽  
Acid Media ◽  
Acid Catalyzed ◽  
Amide Versus

Acid-catalyzed cyclization reactions. XII. Rearrangement of N-acylaziridines in strong acid media

1976 ◽  
Vol 41 (11) ◽  
pp. 1895-1899 ◽  
Author(s):  
Samuel P. McManus ◽  
Richard A. Hearn ◽  
Charles U. Pittman
Keyword(s):  
Strong Acid ◽  
Cyclization Reactions ◽  
Acid Media ◽  
Acid Catalyzed

Acid Catalyzed Rearrangements of Structurally Constrained Tricarbonyl(trans-pentadienyl)iron Cations

1974 ◽  
Vol 52 (11) ◽  
pp. 2085-2097 ◽  
Author(s):  
C. R. Jablonski ◽  
T. S. Sorensen
Keyword(s):  
Positive Charge ◽  
Strong Acid ◽  
Order Process ◽  
Iron Cation ◽  
Acid Media ◽  
First Order ◽  
Bond Rotation ◽  
Carbonium Ions ◽  
Acid Catalyzed ◽  
Secondary Ion

Both the tricarbonyl(1,4-dimethylene-cis, cis, trans, cis-hexa-1,3-dienyl)iron (secondary) and the tricarbonyl(1,4-dimethylene-5-methyl-cis, cis, trans-hexa-1,3-dienyl)iron (tertiary) cations, which cannot convert to a 5h-cis pentadienyl system via a simple bond rotation, can be prepared at low temperature in strong acid media from their related alcohol complexes. The secondary as well as the tertiary ions rearrange to give the thermodynamically more stable tricarbonyl-(1-alkylcyclohexa-1,3-dienyl)iron cation via an acid catalyzed pseudo first order process. The rate of rearrangement of the secondary ion is much faster than that of the tertiary ion indicating a substantial amount of residual positive charge on the exocyclic (β) carbon in the complexed trans-pentadienyl carbonium ions.

Strong acid-catalyzed electrophilic ring expansion of oxetanes and sulfoxonium ylides

2021 ◽  
Vol 510 ◽  
pp. 111687
Author(s):  
Wenhao Yuan ◽  
Wenlai Xie ◽  
Jiaxi Xu
Keyword(s):  
Strong Acid ◽  
Ring Expansion ◽  
Acid Catalyzed

Rearrangement of 1-acylaziridines to oxazolinium cations in strong acid media

1970 ◽  
Vol 35 (4) ◽  
pp. 1187-1190 ◽  
Author(s):  
Charles U. Pittman ◽  
Samuel P. McManus
Keyword(s):  
Strong Acid ◽  
Acid Media

Kinetics and mechanism of the formation of methacrylamide from 2-methyl-2-sulphatopropionamide in strong acid media

1991 ◽  
pp. 417 ◽  
Author(s):  
C. Dennis Hall ◽  
Christopher J. Leeding ◽  
Stephen Jones ◽  
Stephen Case-Green ◽  
Ian Sanderson ◽  
...  
Keyword(s):  
Strong Acid ◽  
Kinetics And Mechanism ◽  
Acid Media
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