• Journal of the Korean Chemical Society
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• v.25 no.2
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• pp.85-91
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• 1981

In order to discuss the existence of the biindenyl dianion, we chose the 2, 3-dimethyl butadiene as a model compound and attempted the CNDO/2 calculations for its monoanino and dianion. We investigated the changes in the electronic structures by means of the partial geometry optimization. We found the stability effects on dianion were markedly different from those on monodianion.

• Bulletin of the Korean Chemical Society
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• v.8 no.4
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• pp.310-313
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• 1987

A dianion-mediated dialkylation reaction provides a variety of propellanes. 12-Thia[4.4.3] propel-3-ene, 3-(N-benzyl)-2,4-dioxotricyclo[3.3.3.0] decane and 3-(N-benzyl)-2,4-dioxotricyclo[3.3.3.0] nonane were prepared by this dianion ring annulation methodology.

• Journal of Integrative Natural Science
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• v.10 no.3
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• pp.131-136
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• 2017

The chemical shifts in the $^{13}C$ NMR spectra of 2,3,4,5-tetraphenyl-1-silacyclopentdienide dianion $[SiC_4Ph_4]^{2-}{\cdot}2[K^+]$ (3) and 2,3,4,5-tetraphenyl-1-germacyclopentdienide dianion $[GeC_4Ph_4]^{2-}{\cdot}2[K^+]$ (4) were compared to those of $[SiC_4Ph_4]^{2-}{\cdot}2[Li^+]$ (5), $[SiC_4Ph_4]^{2-}{\cdot}2[Na^+]$ (6), and $[GeC_4Ph_4]^{2-}{\cdot}2[Li^+]$ (7). The average polarizations in two phenyl groups of two potassium salts are decreased over 15% to 20% comparing to those of the lithium salts and sodium salt {$[EC_4Ph_4]^{2-}{\cdot}2[M^+]$ (E=Si, Ge, M=Li, Na) due to the effect of the counter potassium cation.

• Bulletin of the Korean Chemical Society
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• v.23 no.6
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• pp.911-914
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• 2002

• Journal of the Korean Chemical Society
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• v.30 no.6
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• pp.521-525
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• 1986

From the reaction of phenyltrimethylsilylacetylene with lithium, 1,4-bis(trimethylsilyl)-2,3-diphenyl-1,4-butadene dianion was formed. The reaction of dianion with dichlorodimethylsilane affords 1,1-dimethyl-2,5-bis(trimethylsilyl)-3,4-diphenyl-1-silacyclopenta-2,4-diene. In addition 1,4-bis(trimethylsilyl)-2,3-diphenyl-1,3-butadiene was isolated. It seems to be hydrolized product in alkali medium.

• Journal of Integrative Natural Science
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• v.2 no.3
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• pp.215-218
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• 2009

A silaspirotropylidene has been obtained from the reaction of the lithium salt of tetraphenylsilole dianion with 2 equiv of diphenylcyclopropene, followed by quenching with Me3SiCl. Silaspirotropylidene exhibits an unusual optical property its optical property was characterized by UV-vis and fluorescence spectroscopy. Absorption wavelength maxima of silaspirotropylidene was 420 nm. silaspirotropylidene displayed an emission band at 550 nm with excitation wavelength of 420 nm.

• Bulletin of the Korean Chemical Society
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• v.17 no.1
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• pp.76-77
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• 1996

• Bulletin of the Korean Chemical Society
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• v.4 no.1
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• pp.55-57
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• 1983

• Journal of the Korean Chemical Society
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• v.29 no.4
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• pp.356-364
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• 1985

Ab initio calculations with STO-3G method were carried out on isomers of isobutylene dianion and dilithioisobutylene, and geometry, energy and Mulliken population were discussed. Energy of reaction, ${\Delta}$E, for isodesmic processes involving these species and relative heats of formation, ${\Delta}H_f$, estimated with ${\Delta}$E have shown that the contribution of "Y-aromaticity" to the structural stabilization of Y-type dianion is a tenuous one but the alkylation appears to proceed via the Y-type dilithio compound.

• Journal of the Korean Chemical Society
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• v.34 no.5
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• pp.498-500
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• 1990