2-Azapyrylium salts from aluminum halide .sigma. complexes of cyclobutadienes and nitrosyl chloride. On the possible intermediacy of a heteroatom-substituted pyramidal cation

1985 ◽  
Vol 107 (20) ◽  
pp. 5722-5729 ◽  
Author(s):  
Q. B. Broxterman ◽  
H. Hogeveen ◽  
R. F. Kingma ◽  
F. Van Bolhuis
Keyword(s):  
Nitrosyl Chloride ◽  
Sigma Complexes ◽  
Aluminum Halide

Interaction of heterocycles and nucleophiles. II. Sigma complexes formed from methoxide ion and Methoxy-3,5-dinitropyridines in dimethyl sulphoxide

1970 ◽  
Vol 23 (5) ◽  
pp. 957 ◽  
Author(s):  
MEC Biffin ◽  
J Miller ◽  
AG Moritz ◽  
DB Paul
Keyword(s):  
Dimethyl Sulphoxide ◽  
No Conversion ◽  
Solvation Effects ◽  
Sigma Complexes ◽  
Sigma Complex ◽  
Methoxide Ion ◽  
Rearrangement Reactions

Contrasting behaviour is observed when 2- and 4-methoxy-3,5-dinitropyridine interact with methoxide ion in dimethyl sulphoxide. The 4-methoxy compound affords both methine and acetal sigma complexes, the latter being thermodynamically more stable. The interconversion is catalysed by methanol. Labelling experiments have established that the sigma complex from the 2-methoxypyridine is formed by addition at C6; no conversion into the acetal could be effected. These observations are rationalized in terms of differential steric and solvation effects. Demethylation and rearrangement reactions of 4-methoxy-3,5-dinitropyridine are reported.

Hückel and Möbius Aromaticity in Charged Sigma Complexes

2019 ◽  
Vol 25 (31) ◽  
pp. 7457-7462 ◽  
Author(s):  
Michael Mauksch ◽  
Svetlana B. Tsogoeva
Keyword(s):  
Sigma Complexes

New systems for classical nitrosohalogenation of alkenes 2. Generation of nitrosyl chloride in AgNO2-SOCl2 and AgNO3-SOCl2 systems

2005 ◽  
Vol 54 (9) ◽  
pp. 2145-2149 ◽  
Author(s):  
O. B. Bondarenko ◽  
A. Yu. Gavrilova ◽  
V. N. Tikhanushkina ◽  
N. V. Zyk
Keyword(s):  
Nitrosyl Chloride

ChemInform Abstract: Reaction of Nitrosyl Chloride Gas with Steroidal α-Epoxides.

1986 ◽  
Vol 17 (13) ◽  
Author(s):  
SHAFIULLAH SHAFIULLAH ◽  
M. R. ANSARI ◽  
S. HUSAIN ◽  
H. OGURA ◽  
H. TAKAYANAGI
Keyword(s):  
Nitrosyl Chloride

The Vapor Pressure of Nitrosyl Chloride.

1949 ◽  
Vol 53 (4) ◽  
pp. 500-505 ◽  
Author(s):  
J. R. Partington ◽  
A. L. Whynes
Keyword(s):  
Vapor Pressure ◽  
Nitrosyl Chloride
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