4092-75-5Relevant academic research and scientific papers
PYROTHIOCARBONATES V. SYNTHESIS AND SOME REACTIONS OF S-TRIMETHYLSILYL O-ALKYLDITHIOCARBONATES
Palominos, Mario A.,Vega, Juan C.
, p. 319 - 324 (2007/10/02)
Non-reported S-trimethylsilyl-O-alkyldithiocarbonates (2) are prepared by reaction of O,O-dialkyltrithiodicarbonates with N-methyl-N-trimethylsilylaniline in 87-96percent yield.These air-sensitive liquids which are separated from accompanying phenyl methyl alkylcarbamothioates by fractional distillation.The reaction of 2 with acetyl chloride gives the unsymmetrical dithioanhydrides S-acetyl O-alkyldithiocarbonates in 93-97percent yield.With the less powerfull electrophilic reagent, iodomethane, S-trimethylsilyl O-ethyldithiocarbonate (2a) forms S-methyl O-ethyldithiocarbonate in 30percent yield.When a chloroform solution of 2a is stirred with water the unstable compound O-ethyldithiocarbonic acid is obtained. Key words: Masked O-alkyldithiocarbonic acids; O,O-dialkyltrithiodicarbonates; S-acetyl O-alkyl-dithiocarbonates.
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.
Investigations on the Behaviour of Potassium n-Butyl Xanthate and Benzamidothiosemicarbazide at D.M.E.
Ansari, M. M.,Jain, M. C.,Malik, Wahid U.
, p. 909 - 912 (2007/10/02)
Potassium n-butyl xanthate (PNBX) and benzamidothiosemicarbazide (BTSC) were studied at d.m.e.The polarographic studies carried out on the behaviour of PNBX and BTSC consist of the effect of concentration, pH, supporting electrolytes and mercury column heights.These waves were found to be diffusion controlled.In case of PNBX, E1/2 (-0.22 volts) remained constant with the increase in pH, while in case of BTSC E1/2 increased continuously with the increase in pH.Besides the studies on reversibility of the process, logarithmic analysis of the wave yielded straight lines with mean slope ratio of 0.033 volts (PNBX) and 0.032 volts (BTSC), showing reversible and two electron transfer process.The pK value (8.0) of BTSC has been evaluated from pH vs -E1/2 plot.The mechanism of the dimerisation of these compounds has been proposed.
