Alexander S. Sigeev

New approaches to the synthesis of unsymmetrical diaryl selenides

Abstract Unsymmetrical diaryl selenides PhSeAr were obtained by the palladium catalysed reactions of aryl (heteroaryl) iodide or triflate with Bu 3 SnSePh in high yields. The same compounds can be obtained by the non-catalytic reactions of Bu 3 SnSePh with ArN 2 BF 4 or (ArN 2 ) 2 ZnCl 4 .

Copper(I)-catalyzed arylselenylation of aryl bromides and iodides

A new protocol to prepare unsymmetrical diarylselenides using the reaction of aryl bromides and iodides with easily available Bu3SnSeAr catalyzed by Cu(I) complexes under rather mild conditions and with a very high yield is described.

Tributylstannyl Aryl Selenides as Efficient Arylselenating Agents in the Synthesis of Seleno Esters

Tributyltin aryl selenides are convenient and highly efficient arylselenating agents in reactions with acyl chlorides. The activity of acetic anhydride is considerably lower but it can be involved into the arylselenation reaction in the presence of PdCl2(PPh3)2 or boron trifluoride etherate as catalysts.

Cu(I)/Cu(II)/TMEDA, new effective available catalyst of sandmeyer reaction

The system Cu(I)/Cu(II)/N,N,N′,N′-tetramethylethylenediamine is a highly efficient and accessible catalyst of Sandmeyer reaction. The reaction of aryldiazonium salts with chlorides, bromides,, cyanides, and thiocyanates of alkaline metals in the presence of this catalytic system leads to the formation of the corresponding aryl halides, nitriles, and thiocyanates in high yields.

Tributyltin Aryl Selenides as Efficient Arylselenating Agents. Synthesis of Diaryl and Aryl Organyl Selenides

Tributyltin aryl selenides are highly efficient arylselenating agents in reactions with aryl iodides and aryl triflates under catalysis with Pd and Ni complexes respectively. They also may be used as efficient source of active arylselenolate anion in the presence of fluoride ions in reaction of arylselenation of alkyl halides and activated aryl fluorides.

Flash photolysis investigation of the reaction of phenylselanyl radicals with hexabutyldistannane

The reaction of the phenylselanyl radical with hexabutyldistannane was studied by flash photolysis and the rate constants and activation parameters were determined.