scholarly journals Crystal and Molecular Structure Analysis in Knoevenagel Condensation Product of Substituted Napthofuran-2-Carbaldehydes

2020 ◽  
Vol 09 (03) ◽  
pp. 49-62
Author(s):  
Avantika Hasija ◽  
V. Prakash ◽  
M. Shet Prakash ◽  
  Vasu ◽  
G. Krishnasamy ◽  
...  

1994 ◽  
Vol 5 (2) ◽  
pp. 79-84 ◽  
Author(s):  
J. M. Cense ◽  
V. Agafonov ◽  
R. Ceolin ◽  
P. Ladure ◽  
N. Rodier




ChemInform ◽  
2010 ◽  
Vol 22 (43) ◽  
pp. no-no
Author(s):  
W. J. WELSH ◽  
V. CODY ◽  
K. SUWINSKA ◽  
K. D. BERLIN ◽  
S. N. RAJADHYAKSHA ◽  
...  




2015 ◽  
Vol 609 (1) ◽  
pp. 118-125 ◽  
Author(s):  
M. M. Savant ◽  
L. B. Gowda ◽  
S. M. Anandalwar ◽  
J. S. Prasad ◽  
A. Shah ◽  
...  


1989 ◽  
Vol 44 (10) ◽  
pp. 1233-1238 ◽  
Author(s):  
H.-D. Hausen ◽  
Wolfgang Kaim ◽  
Andreas Schulz ◽  
Eberhard Roth

Crystal and molecular structure analysis of N,N′-diethylquinoxalinium tetraphenylborate shows a virtually planar quinoxaline ring with 11 conjugated π electrons and approximately antiperiplanar ethyl groups. In comparison with the benzo-analogous phenazinium systems and the de-benzo derivative N,N′-diethylpyrazinium cation, the quinoxalinium species adopts an intermediate position in terms of intra- and intermolecular structural features. In particular, increasing benzanellation seems to favour a cation/anion approach for electrostatic reasons whereas the N—C bonds to the hyperconjugatively charge delocalizing alkyl groups increase due to peri interactions. Solid state magnetic and ESR measurements are compatible with the crystallographically determined structure.



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