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Norihiro Tokitoh - One of the best experts on this subject based on the ideXlab platform.
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reactivity of an aryl substituted silicon silicon triple bond 1 2 disilabenzenes from the reactions of a 1 2 diaryldisilyne with alkynes
Dalton Transactions, 2010Co-Authors: Joon Soo Han, Takahiro Sasamori, Yoshiyuki Mizuhata, Norihiro TokitohAbstract:The reactivity of a diaryl-substituted disilyne, Ar-Si[triple bond, length as m-dash]Si-Ar, with alkynes was examined. Reaction of the disilyne with acetylene yielded a 1,2-disilabenzene as the sole product.
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reactivity of an aryl substituted silicon silicon triple bond reactions of a 1 2 diaryldisilyne with alkenes
Journal of the American Chemical Society, 2010Co-Authors: Joon Soo Han, Takahiro Sasamori, Yoshiyuki Mizuhata, Norihiro TokitohAbstract:The reactivity of a bulky, diaryl-substituted disilyne, Ar−Si≡Si−Ar, was examined for the first time. Reaction of the disilyne with ethylene yielded an ethylene-bridged bis(silacyclopropane), which is interpreted as a further reaction product of the initially formed 1,2-disilacyclobutene species with ethylene. A cyclohexane fused with a 1,2-disilacyclobutene was obtained in the reaction with cyclohexene. In the reaction with 2,3-dimethyl-1,3-butadiene, a tricyclo derivative was isolated from the complex product mixture.
Masayoshi Nakano - One of the best experts on this subject based on the ideXlab platform.
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open shell singlet nature and σ π conjugation effects on the third order nonlinear optical properties of si chains polysilane and poly disilene 1 2 diyl
Journal of Physical Chemistry A, 2016Co-Authors: Hiroshi Matsui, Kotaro Fukuda, Soichi Ito, Takanori Nagami, Masayoshi NakanoAbstract:We theoretically investigate the open-shell singlet nature and σ-/π-conjugation effects on the longitudinal second hyperpolarizabilities (γ) of one-dimensional chains involving silicon–silicon bonds, that is, polysilane and poly(disilene-1,2-diyl), by comparison with their carbon analogues, polyethylene and polyacetylene, respectively. It is found that poly(disilene-1,2-diyl) has less bond length alternation than polyacetylene and that σ-conjugation of polysilane is less effective on the enhancement of γ than π-conjugation of polyacetylene, whereas π-conjugation of poly(disilene-1,2-diyl) indicates a more than 20 times greater enhancement of the γ than that of polyacetylene, which is known to be a typical nonlinear optical molecule with large γ, for one-dimensional chains involving 3–5 double bonds. Further theoretical analyses of poly(disilene-1,2-diyl) reveal the σ- and π-electrons contribute negatively and positively to the γ, respectively. The latter contribution is significantly larger than the forme...
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Open-Shell Singlet Nature and σ‑/π-Conjugation Effects on the Third-Order Nonlinear Optical Properties of Si Chains: Polysilane and Poly(disilene-1,2-diyl)
2016Co-Authors: Hiroshi Matsui, Kotaro Fukuda, Soichi Ito, Takanori Nagami, Masayoshi NakanoAbstract:We theoretically investigate the open-shell singlet nature and σ-/π-conjugation effects on the longitudinal second hyperpolarizabilities (γ) of one-dimensional chains involving silicon–silicon bonds, that is, polysilane and poly(disilene-1,2-diyl), by comparison with their carbon analogues, polyethylene and polyacetylene, respectively. It is found that poly(disilene-1,2-diyl) has less bond length alternation than polyacetylene and that σ-conjugation of polysilane is less effective on the enhancement of γ than π-conjugation of polyacetylene, whereas π-conjugation of poly(disilene-1,2-diyl) indicates a more than 20 times greater enhancement of the γ than that of polyacetylene, which is known to be a typical nonlinear optical molecule with large γ, for one-dimensional chains involving 3–5 double bonds. Further theoretical analyses of poly(disilene-1,2-diyl) reveal the σ- and π-electrons contribute negatively and positively to the γ, respectively. The latter contribution is significantly larger than the former and thus causes the remarkable enhancement of γ amplitudes due to the emerging open-shell singlet nature in the long π-conjugation length
Manolis Stratakis - One of the best experts on this subject based on the ideXlab platform.
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Tandem Si–Si and Si–H Activation of 1,1,2,2-TetramethylDisilane by Gold Nanoparticles in Its Reaction with Alkynes: Synthesis of Substituted 1,4-Disila-2,5-cyclohexadienes
2015Co-Authors: Ioannis Titilas, Charis Gryparis, Marios Kidonakis, Manolis StratakisAbstract:The Au/TiO2-catalyzed reaction between 1,1,2,2-tetramethylDisilane and terminal alkynes yields substituted 1,4-disila-2,5-cyclohexadienes (1,1,4,4-tetramethyl-1,4-dihydro-1,4-disilines) in moderate to good yields. The reaction proceeds via initial Si–Si activation of Disilane by gold nanoparticles to form with alkynes isolable cis-1,2-disilyl adducts (cis-1,2-bis(dimethylsilyl)ethenes), which, under the reaction conditions, undergo a Au-catalyzed dehydrogenative cycloaddition to a second alkyne molecule, forming the final cycloadducts
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gold nanoparticles catalyzed activation of 1 2 Disilanes hydrolysis silyl protection of alcohols and reduction of tert benzylic alcohols
ChemInform, 2013Co-Authors: Charis Gryparis, Manolis StratakisAbstract:The hydrolysis of Disilanes (I) in the presence of a gold catalyst gives rise to disiloxane (II) and/or silanols (III).
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gold nanoparticles catalyzed activation of 1 2 Disilanes hydrolysis silyl protection of alcohols and reduction of tert benzylic alcohols
Chemical Communications, 2012Co-Authors: Charis Gryparis, Manolis StratakisAbstract:Gold nanoparticles supported on TiO2 catalyze under mild conditions the activation of a series of 1,2-Disilanes towards hydrolysis and alcoholysis, with concomitant evolution of H2 gas. For the case of tert-benzyl alcohols, the main or only pathway is reduction to the corresponding alkanes.
Joon Soo Han - One of the best experts on this subject based on the ideXlab platform.
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reactivity of an aryl substituted silicon silicon triple bond 1 2 disilabenzenes from the reactions of a 1 2 diaryldisilyne with alkynes
Dalton Transactions, 2010Co-Authors: Joon Soo Han, Takahiro Sasamori, Yoshiyuki Mizuhata, Norihiro TokitohAbstract:The reactivity of a diaryl-substituted disilyne, Ar-Si[triple bond, length as m-dash]Si-Ar, with alkynes was examined. Reaction of the disilyne with acetylene yielded a 1,2-disilabenzene as the sole product.
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reactivity of an aryl substituted silicon silicon triple bond reactions of a 1 2 diaryldisilyne with alkenes
Journal of the American Chemical Society, 2010Co-Authors: Joon Soo Han, Takahiro Sasamori, Yoshiyuki Mizuhata, Norihiro TokitohAbstract:The reactivity of a bulky, diaryl-substituted disilyne, Ar−Si≡Si−Ar, was examined for the first time. Reaction of the disilyne with ethylene yielded an ethylene-bridged bis(silacyclopropane), which is interpreted as a further reaction product of the initially formed 1,2-disilacyclobutene species with ethylene. A cyclohexane fused with a 1,2-disilacyclobutene was obtained in the reaction with cyclohexene. In the reaction with 2,3-dimethyl-1,3-butadiene, a tricyclo derivative was isolated from the complex product mixture.
Hiroshi Matsui - One of the best experts on this subject based on the ideXlab platform.
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open shell singlet nature and σ π conjugation effects on the third order nonlinear optical properties of si chains polysilane and poly disilene 1 2 diyl
Journal of Physical Chemistry A, 2016Co-Authors: Hiroshi Matsui, Kotaro Fukuda, Soichi Ito, Takanori Nagami, Masayoshi NakanoAbstract:We theoretically investigate the open-shell singlet nature and σ-/π-conjugation effects on the longitudinal second hyperpolarizabilities (γ) of one-dimensional chains involving silicon–silicon bonds, that is, polysilane and poly(disilene-1,2-diyl), by comparison with their carbon analogues, polyethylene and polyacetylene, respectively. It is found that poly(disilene-1,2-diyl) has less bond length alternation than polyacetylene and that σ-conjugation of polysilane is less effective on the enhancement of γ than π-conjugation of polyacetylene, whereas π-conjugation of poly(disilene-1,2-diyl) indicates a more than 20 times greater enhancement of the γ than that of polyacetylene, which is known to be a typical nonlinear optical molecule with large γ, for one-dimensional chains involving 3–5 double bonds. Further theoretical analyses of poly(disilene-1,2-diyl) reveal the σ- and π-electrons contribute negatively and positively to the γ, respectively. The latter contribution is significantly larger than the forme...
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Open-Shell Singlet Nature and σ‑/π-Conjugation Effects on the Third-Order Nonlinear Optical Properties of Si Chains: Polysilane and Poly(disilene-1,2-diyl)
2016Co-Authors: Hiroshi Matsui, Kotaro Fukuda, Soichi Ito, Takanori Nagami, Masayoshi NakanoAbstract:We theoretically investigate the open-shell singlet nature and σ-/π-conjugation effects on the longitudinal second hyperpolarizabilities (γ) of one-dimensional chains involving silicon–silicon bonds, that is, polysilane and poly(disilene-1,2-diyl), by comparison with their carbon analogues, polyethylene and polyacetylene, respectively. It is found that poly(disilene-1,2-diyl) has less bond length alternation than polyacetylene and that σ-conjugation of polysilane is less effective on the enhancement of γ than π-conjugation of polyacetylene, whereas π-conjugation of poly(disilene-1,2-diyl) indicates a more than 20 times greater enhancement of the γ than that of polyacetylene, which is known to be a typical nonlinear optical molecule with large γ, for one-dimensional chains involving 3–5 double bonds. Further theoretical analyses of poly(disilene-1,2-diyl) reveal the σ- and π-electrons contribute negatively and positively to the γ, respectively. The latter contribution is significantly larger than the former and thus causes the remarkable enhancement of γ amplitudes due to the emerging open-shell singlet nature in the long π-conjugation length