The Experts below are selected from a list of 93 Experts worldwide ranked by ideXlab platform
Igor V Shevchenko - One of the best experts on this subject based on the ideXlab platform.
-
nucleophilic activation of a nitrile group synthesis of trifluoromethyl substituted 4h 1 3 5 Dioxazines
ChemInform, 2012Co-Authors: Kostiantyn Turcheniuk, Igor V ShevchenkoAbstract:The negatively charged carbon atom of phosphorus ylides (III) activates the nucleophilicity of the nitrile group which enables the addition of two molecules of hexafluoroacetone (IV) to give Dioxazines (V).
-
nucleophilic activation of a nitrile group synthesis of trifluoromethyl substituted 4h 1 3 5 Dioxazines
Journal of Fluorine Chemistry, 2012Co-Authors: Kostiantyn Turcheniuk, Igor V ShevchenkoAbstract:Abstract The negatively charged carbon atom of phosphorus ylides is capable of increasing the nucleophilicity of the triple CN bond. The nitrile group activated in this way can add two equivalents of hexafluoroacetone with the formation of trifluoromethyl substituted 4H-1,2,3-Dioxazines. Due to delocalization of the ylidic negative charge one of the C–C bonds acquires a double bond character, the consequence of which is the existence of E/Z-isomerism in these compounds.
Kostiantyn Turcheniuk - One of the best experts on this subject based on the ideXlab platform.
-
nucleophilic activation of a nitrile group synthesis of trifluoromethyl substituted 4h 1 3 5 Dioxazines
ChemInform, 2012Co-Authors: Kostiantyn Turcheniuk, Igor V ShevchenkoAbstract:The negatively charged carbon atom of phosphorus ylides (III) activates the nucleophilicity of the nitrile group which enables the addition of two molecules of hexafluoroacetone (IV) to give Dioxazines (V).
-
nucleophilic activation of a nitrile group synthesis of trifluoromethyl substituted 4h 1 3 5 Dioxazines
Journal of Fluorine Chemistry, 2012Co-Authors: Kostiantyn Turcheniuk, Igor V ShevchenkoAbstract:Abstract The negatively charged carbon atom of phosphorus ylides is capable of increasing the nucleophilicity of the triple CN bond. The nitrile group activated in this way can add two equivalents of hexafluoroacetone with the formation of trifluoromethyl substituted 4H-1,2,3-Dioxazines. Due to delocalization of the ylidic negative charge one of the C–C bonds acquires a double bond character, the consequence of which is the existence of E/Z-isomerism in these compounds.
Tao Zhang - One of the best experts on this subject based on the ideXlab platform.
-
the methods for creating building energy efficient cool black coatings
Energy and Buildings, 2014Co-Authors: Jianrong Song, Jingfang Li, Lihong Jiang, Jian Qu, Zhongnan Song, Weidong Zhang, Tao ZhangAbstract:Abstract The optical and thermal properties of black coatings pigmented with different black colorants were systematically investigated, and their surface temperature reduction values and cooling energy savings were estimated relative to the black coating pigmented with carbon black in Shanghai, China. The black coatings separately pigmented with NIR-transmitting perylene black and Dioxazine purple colorants were identified to be real cool black coatings. The addition of chrome titanium yellow to the black coating pigmented with Dioxazine purple re-establishes the true black coatings. Over white basecoats, the estimated surface temperature reduction values and annual cooling energy savings in Shanghai are 13.8 °C and 3.9 kW h m −2 yr −1 , respectively, for the black coating pigmented with perylene black colorant; these two values are 10.2 °C and 2.24 kW h m −2 yr −1 , respectively, for the black coating pigmented with Dioxazine purple colorant.
-
the methods for creating energy efficient cool gray building coatings part i preparation from white and black pigments
Solar Energy Materials and Solar Cells, 2014Co-Authors: Jianrong Song, Jingfang Li, Lihong Jiang, Jian Qu, Zhongnan Song, Weidong Zhang, Tao ZhangAbstract:We describe the method for creating nominally cool gray coatings by mixing titanium dioxide rutile and black pigments that include chromite iron nickel black, manganese ferrite black spinel, perylene black and Dioxazine purple. Although the solar reflectance of the gray coatings prepared by adding chromite iron nickel black and manganese ferrite black spinel pastes separately into a white coating are higher than that of the standard gray coating of colors of similarly lightness with the mixtures of carbon black and titanium dioxide rutile, they are actually not qualified cool gray coatings. The light gray coatings colored with a mixture of perylene black and titanium dioxide rutile are eligible cool gray coatings with a green shade. The gray coatings produced by mixing titanium dioxide rutile and Dioxazine purple and chrome titanium yellow are also real cool coatings with a violet shade.
Jianrong Song - One of the best experts on this subject based on the ideXlab platform.
-
the methods for creating building energy efficient cool black coatings
Energy and Buildings, 2014Co-Authors: Jianrong Song, Jingfang Li, Lihong Jiang, Jian Qu, Zhongnan Song, Weidong Zhang, Tao ZhangAbstract:Abstract The optical and thermal properties of black coatings pigmented with different black colorants were systematically investigated, and their surface temperature reduction values and cooling energy savings were estimated relative to the black coating pigmented with carbon black in Shanghai, China. The black coatings separately pigmented with NIR-transmitting perylene black and Dioxazine purple colorants were identified to be real cool black coatings. The addition of chrome titanium yellow to the black coating pigmented with Dioxazine purple re-establishes the true black coatings. Over white basecoats, the estimated surface temperature reduction values and annual cooling energy savings in Shanghai are 13.8 °C and 3.9 kW h m −2 yr −1 , respectively, for the black coating pigmented with perylene black colorant; these two values are 10.2 °C and 2.24 kW h m −2 yr −1 , respectively, for the black coating pigmented with Dioxazine purple colorant.
-
the methods for creating energy efficient cool gray building coatings part i preparation from white and black pigments
Solar Energy Materials and Solar Cells, 2014Co-Authors: Jianrong Song, Jingfang Li, Lihong Jiang, Jian Qu, Zhongnan Song, Weidong Zhang, Tao ZhangAbstract:We describe the method for creating nominally cool gray coatings by mixing titanium dioxide rutile and black pigments that include chromite iron nickel black, manganese ferrite black spinel, perylene black and Dioxazine purple. Although the solar reflectance of the gray coatings prepared by adding chromite iron nickel black and manganese ferrite black spinel pastes separately into a white coating are higher than that of the standard gray coating of colors of similarly lightness with the mixtures of carbon black and titanium dioxide rutile, they are actually not qualified cool gray coatings. The light gray coatings colored with a mixture of perylene black and titanium dioxide rutile are eligible cool gray coatings with a green shade. The gray coatings produced by mixing titanium dioxide rutile and Dioxazine purple and chrome titanium yellow are also real cool coatings with a violet shade.
Weidong Zhang - One of the best experts on this subject based on the ideXlab platform.
-
the methods for creating building energy efficient cool black coatings
Energy and Buildings, 2014Co-Authors: Jianrong Song, Jingfang Li, Lihong Jiang, Jian Qu, Zhongnan Song, Weidong Zhang, Tao ZhangAbstract:Abstract The optical and thermal properties of black coatings pigmented with different black colorants were systematically investigated, and their surface temperature reduction values and cooling energy savings were estimated relative to the black coating pigmented with carbon black in Shanghai, China. The black coatings separately pigmented with NIR-transmitting perylene black and Dioxazine purple colorants were identified to be real cool black coatings. The addition of chrome titanium yellow to the black coating pigmented with Dioxazine purple re-establishes the true black coatings. Over white basecoats, the estimated surface temperature reduction values and annual cooling energy savings in Shanghai are 13.8 °C and 3.9 kW h m −2 yr −1 , respectively, for the black coating pigmented with perylene black colorant; these two values are 10.2 °C and 2.24 kW h m −2 yr −1 , respectively, for the black coating pigmented with Dioxazine purple colorant.
-
the methods for creating energy efficient cool gray building coatings part i preparation from white and black pigments
Solar Energy Materials and Solar Cells, 2014Co-Authors: Jianrong Song, Jingfang Li, Lihong Jiang, Jian Qu, Zhongnan Song, Weidong Zhang, Tao ZhangAbstract:We describe the method for creating nominally cool gray coatings by mixing titanium dioxide rutile and black pigments that include chromite iron nickel black, manganese ferrite black spinel, perylene black and Dioxazine purple. Although the solar reflectance of the gray coatings prepared by adding chromite iron nickel black and manganese ferrite black spinel pastes separately into a white coating are higher than that of the standard gray coating of colors of similarly lightness with the mixtures of carbon black and titanium dioxide rutile, they are actually not qualified cool gray coatings. The light gray coatings colored with a mixture of perylene black and titanium dioxide rutile are eligible cool gray coatings with a green shade. The gray coatings produced by mixing titanium dioxide rutile and Dioxazine purple and chrome titanium yellow are also real cool coatings with a violet shade.