Quantum chemical study of sulfonium ylides: Structure, charge distribution and dipole moments

1980 ◽  
Vol 45 (4) ◽  
pp. 1236-1250 ◽  
Author(s):  
Vladimír Král ◽  
Zdeněk Arnold ◽  
Václav Jehlička ◽  
Otto Exner
Keyword(s):  
Ab Initio ◽  
Charge Distribution ◽  
Quantum Chemical ◽  
Dipole Moments ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Quantum Chemical Methods ◽  
Sulfonium Ylide ◽  
Experimental Values ◽  
Sulfonium Ylides

The geometry, charge distribution and dipole moments of parent sulfonium ylide - dimethylsulfoniomethylide (I) - and a series of stabilized sulfonium ylides, including 2-dimethylsulfuranylidene-1,3-cyclopentanedione (VI) prepared in this study, was investigated using the CNDO/2, PCILO and ab initio methods. Values of dipole moments, calculated by quantum chemical methods (CNDO/2 with sp and spd bases, ab initio with the STO-3G basis) as well as by the method of empirical bond moments, are compared with the experimental values determined in dioxane or benzene. Dipole moments of several related ammonium ylides were also studied.

Study of some aliphatic ammonium ylides by semiempirical and ab initio methods: Structure and charge distribution

1980 ◽  
Vol 45 (1) ◽  
pp. 92-103 ◽  
Author(s):  
Vladimír Král ◽  
Zdeněk Arnold
Keyword(s):  
Ab Initio ◽  
Charge Distribution ◽  
Quantum Chemical ◽  
Negative Charge ◽  
Dipole Moments ◽  
Ab Initio Methods ◽  
Chemical Methods ◽  
Quantum Chemical Methods

Structure of, and charge distribution in, some aliphatic ammonium ylides were determined by quantum chemical methods (CNDO/2, INDO, MINDO/2, PCILO, ab initio-STO-3G and 4-31G bases). Non-stabilized ylides were found to have pyramidal arrangement of bonds on the ylide carbon whereas the stabilized ylides have a planar arrangement. The charge distribution in stabilized ylides indicates a significant transfer of the negative charge from the ylide carbon to the electronegative groups. The calculated dipole moments for the previously prepared compounds, as well as for the derivatives VII and X, described in this paper, agree well with the experimental value.

Dipole moments and quantum chemical study of the structure of furan-containing gem-bromonitroethenes

2015 ◽  
Vol 51 (9) ◽  
pp. 1282-1285
Author(s):  
Ya. A. Vereshchagina ◽  
D. V. Chachkov ◽  
R. R. Khanafieva ◽  
A. Z. Alimova ◽  
V. M. Berestovitskaya ◽  
...  
Keyword(s):  
Quantum Chemical ◽  
Dipole Moments ◽  
Quantum Chemical Study ◽  
Chemical Study

AB initio quantum chemical study of the reaction mechanism of ethynide ion formation in the C2H2/MOH/DMSO system (M = Li, Na, K)

2009 ◽  
Vol 50 (1) ◽  
pp. 27-33 ◽  
Author(s):  
E. Yu. Larionova ◽  
N. M. Vitkovskaya ◽  
V. B. Kobychev ◽  
N. V. Kaempf ◽  
A. D. Skitnevskaya ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Ab Initio ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Ion Formation ◽  
Dmso System
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