Ring Size and Substituent Effects in Oxyanion-Promoted Cyclizations of Enyne-allenes:  Observation of a Myers−Saito Cycloaromatization at Cryogenic Temperature

2006 ◽  
Vol 71 (22) ◽  
pp. 8372-8377 ◽  
Author(s):  
Michelle K. Waddell ◽  
Tefsit Bekele ◽  
Mark A. Lipton
Keyword(s):  
Cryogenic Temperature ◽  
Substituent Effects ◽  
Ring Size

ChemInform Abstract: Ring-Size and Substituent Effects in Intramolecular Reactions of Alkylidenecarbenes (Carbenoids).

ChemInform ◽  
2010 ◽  
Vol 23 (2) ◽  
pp. no-no
Author(s):  
M. S. BAIRD ◽  
A. G. W. BAXTER ◽  
A. HOORFAR ◽  
I. JEFFERIES
Keyword(s):  
Substituent Effects ◽  
Ring Size ◽  
Intramolecular Reactions

Influencing of Ring Size on Germinal Interproton Coupling Constants in Exocyclic Methylene Groups

1985 ◽  
Vol 38 (6) ◽  
pp. 889 ◽  
Author(s):  
RJ Spear ◽  
S Sternhell
Keyword(s):  
Experimental Data ◽  
Substituent Effects ◽  
Size Reduction ◽  
Coupling Constants ◽  
Ring Size ◽  
Methylene Groups ◽  
Exocyclic Methylene

In systems where substituent effects are constant, there is a well defined trend in the magnitude of geminal interproton coupling constants in exocyclic methylene groups with ring size. Reduction of ring size from six to five to four results in a monotonic reduction in the magnitude of Jgem. These trends apply to methylenecycloalkanes , methylenebenzocycloalkenes and α- methylenecycloalkanones . There is an indication that the trend does not continue for methylenecyclopropanes. A number of new exocyclic-methylene compounds have been designed and synthesized to provide specific experimental data.

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