Abstract
Bismuth(III) salophen as a new catalyst has been synthesized. Structural properties of this complex have been studied by Fourier transform infrared spectroscopy, X-ray diffraction, differential scanning calorimetry, and thermal gravimetric analyses. The average crystalline size of Bi-salophen particles was 86 nm. Thermal analyses show that the complex is stable over 300°C. Catalytic activity of this catalyst has been investigated in oxidation of sulfides. Different kinds of sulfides have been oxidized to the corresponding sulfoxides efficiently in the presence of sodium periodate as oxidant in glacial acetic acid as solvent at room temperature. These sulfides were selectively and completely converted into their corresponding sulfoxides in very short reaction times. Selectivity of this method was excellent, which is another advantage of this method.
Highlights
Schiff base complexes have been extensively used in a variety of applications including biological [1], clinical [2], analytical [3], and catalysis [4,5,6,7,8,9,10,11]
A number of reports have appeared describing the use of a Schiff base complex as a catalyst in the oxidation of sulfides [12,13,14]
Bismuth derivatives have been widely used in medicine [16]. They have attracted much attention because they are easy to handle, low in cost, and relatively insensitive to air and moisture [17]. In combining these two areas of interest, we are encouraged to use a Bi-salophen complex in the selective oxidation of sulfides into the corresponding sulfoxides (Scheme 1) which is an important method in organic synthesis because sulfoxides are useful synthetic intermediates for the construction of various chemically and biologically
Summary
Schiff base complexes have been extensively used in a variety of applications including biological [1], clinical [2], analytical [3], and catalysis [4,5,6,7,8,9,10,11]. A number of reports have appeared describing the use of a Schiff base complex as a catalyst in the oxidation of sulfides [12,13,14]. Bismuth derivatives have been widely used in medicine [16] They have attracted much attention because they are easy to handle, low in cost, and relatively insensitive to air and moisture [17]. In combining these two areas of interest, we are encouraged to use a Bi-salophen complex in the selective oxidation of sulfides into the corresponding sulfoxides (Scheme 1) which is an important method in organic synthesis because sulfoxides are useful synthetic intermediates for the construction of various chemically and biologically
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