2905-52-4Relevant articles and documents
1-Alkyl-4-ethoxythiocarbonyl-5-hydroxy-3-methylpyrazole: Synthesis, copper complexes and solvent extraction studies
Oliva, Alfonso,Molinari, Aurora,Toro, Carolina
experimental part, p. 329 - 335 (2009/05/31)
1-Alkyl-4-ethoxythiocarbonyl-5-hydroxy-3-methylpyrazole, HETCP, (alkyl = n-octyl ; n-dodecyl) were prepared in high yield by the reaction of 1-alkyl-3-methyl-2-pyrazolin-5-one with bis (ethoxythiocarbonyl)sulfide and sodium acetate in dimethylformamide. These reagents act as O, S bidentate ligands in solvent extraction/reextraction studies of Cu (II) from acid aqueous solutions and the extracted specie resulted to be Cu(ETCP)2.
Kinetics and Mechanism of the Reactions of S-Ethoxycarbonyl O-Ethyl Dithiocarbonate with O-Ethyl Xanthate and O-Ethyl Thiocarbonate Ions
Castro, Enrique A.,Meneses, Beatriz,Santos, Jose G.,Vega, Juan C.
, p. 1863 - 1866 (2007/10/02)
The forward and back reactions of S-ethoxycarbonyl O-ethyl dithiocarbonate (1) with O-ethyl thiocarbonate (4) and O-ethyl xanthate (5) in 95percent ethanol are studied kinetically.The back reaction products are bis(ethoxycarbonyl) sulfide (3) with 5 and bis(ethoxythiocarbonyl) sulfide (2) with 4, respectively.Compound 1 reacts faster than 2 with 4, which means that the carbonyl group is more reactive than the thiocarbonyl toward 4.On the other hand, the reaction of 5 with 1 is faster than that with 3, which indicates that 5 reacts more readily with the thiocarbonyl than the carbonyl group.Two mechanisms are proposed to account for the kinetics results: one through tetrahedral intermediates (two-step reactions) and the other concerted.The reactions of 4 exibit ΔS >0, whereas those of 5 show ΔS 0.These ΔS values are explained by a larger solvation of 4 relative to 5 and similar degrees of solvation of transition states and substrates.The observed activation parameters do not allow discrimination between the two mechanisms.
Pyrothiocarbonates. Part 2. Reaction of S-Ethoxycarbonyl O-Ethyl Dithiocarbonate with some Potassium O-Alkylthiocarbonates
Palominos, Mario A.,Santos, Jose G.,Valderrama, Jaime A.,Vega, Juan C.
, p. 2641 - 2643 (2007/10/02)
The thiolysis of S-ethoxycarbonyl O-ethyl dithiocarbonate (1) has been examined in order to study both its transesterification reaction and the reactivities of its carbonyl and thiocarbonyl groups.The two symmetrical pyrothiocarbonates (EtOCS)2S (4) and (EtOCO)2S (5) are produced by reactions of (1) with EtOCS2K (7) or EtOCOSK (8) in 95percent ethanol at 0 deg C; (4) was always the main product in the reaction with (7) whereas (5) was initially the main product in the reaction with (8).The reaction of (1) with BuOCS2K yielded first BuOCS2CSOEt and then BuOCS2CO2Et and (BuOCS)2S.These results indicate that the thiocarbonyl group of (1) is more reactive than the carbonyl one.
