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Yelwande, Ajeet A.,Navgire, Madhukar E.,Tayde, Deepak T.,Arbad, Balasaheb R.,Lande, Machhindra K. Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.6
$SnO_2/SiO_2$ nanocomposite has been synthesized by using sol-gel method. Prepared catalytic materials has been well characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmer-Teller (BET) surface area, and temperature-programmed desorption of ammonia ($NH_3$-TPD). $SnO_2/SiO_2$ nanocomposite catalyzed synthesis of 2-arylbenzothiazoles by the cyclocondensation of 2-aminothiophenol and aromatic aldehydes under reflux condition in 1:1 EtOH:$H_2O$. After completion of the reaction, catalyst can be recovered efficiently and reused with consistent activity.
SnO2/SiO2 Nanocomposite Catalyzed One-Pot Synthesis of 2-Arylbenzothiazole Derivatives
Ajeet A. Yelwande,Madhukar E. Navgire,Deepak T. Tayde,Balasaheb R. Arbad,Machhindra K. Lande 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.6
SnO2/SiO2 nanocomposite has been synthesized by using sol-gel method. Prepared catalytic materials has been well characterized by using X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FT-IR), Brunauer-Emmer-Teller (BET) surface area, and temperature-programmed desorption of ammonia (NH3-TPD). SnO2/SiO2 nanocomposite catalyzed synthesis of 2-arylbenzothiazoles by the cyclocondensation of 2-aminothiophenol and aromatic aldehydes under reflux condition in 1:1 EtOH:H2O. After completion of the reaction, catalyst can be recovered efficiently and reused with consistent activity.
Yelwande, Ajeet A.,Arbad, Balasaheb R.,Lande, Machhindra K. Korean Chemical Society 2011 대한화학회지 Vol.55 No.4
Polyaniline/$SiO_2$ 촉매를 이용하여, acetophenone, aromatic aldehydes와 aromatic amines을 에탄올 용매 속에서 반응시켜서 다양한 various ${\beta}$-amino ketones을 one-pot mannich 반응을 수행하였으며, 이 반응을 위해 silica가 충진된 여러 가지 종류의 wt% polyaniline을 화학적인 산화방법에 의해 합성하였다. 합성한 촉매는 thermal analysis(TG-DTA), X-ray diffraction (XRD), scanning electron microscopy(SEM) energy dispersive spectroscopy(EDS), 및 Fourier transform infrared spectroscopy (FT-IR) 방법으로 확인하였으며, 촉매의 용매에 대한 안정도 UV-Visible spectroscopy로 측정하였다. Polyaniline/$SiO_2$ 촉매를 이용하는 합성 방법은높은 수율로 얻어지며, work up이 쉽고, 독성이 없으며, 쉽게 회수하여 재사용이 가능하다. Polyaniline/$SiO_2$ catalyzed one-pot mannich reaction of acetophenone, aromatic aldehydes and aromatic amines are carried out in ethanol to afford various ${\beta}$-amino ketones. The various wt% of polyaniline were supported on pure silica synthesized by using chemical oxidative method. The catalyst prepared has been characterized by means of thermal analysis (TG-DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM) energy dispersive spectroscopy (EDS), and Fourier transform infrared spectroscopy (FT-IR). Solvent stability of catalyst was tested using UV-Visible spectroscopy. This protocol has several advantages such as high yield, simple work up procedure, non-toxic, clean, easy recovery and reusability of the catalyst.
Machhindra Lande,Madhukar Navgire,Sandip Rathod,Santosh Katkar,Ajeet Yelwande,Balasaheb Arbad 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
A series of carbon-doped MoO3–TiO2 (CMT) material were prepared by sol–gel method. The catalyst prepared has been characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and Fourier transform infrared spectroscopy (FT-IR). The natural wood plant Acacia arabica used as a source for carbon substrate. The effect of variation of wt.% of carbon doping was successfully evaluated for the preparation of quinoxalines by the condensation of benzil and 1,2-diamine under ultra-sonication in EtOH:water (3:1). The merits of the present investigation are extremely short reaction times, mild reaction conditions, excellent yield, simple workup and environmentally benign process.