Potassium ethylxanthate

This chemical does not meet GHS hazard criteria for 2.3% (2 of 88) of reports.

Danger

H228 (52.3%): Flammable solid [Danger Flammable solids]

P210, P240, P241, P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P317, P319, P321, P330, P332+P317, P337+P317, P362+P364, P370+P378, P403+P233, P405, and P501 (click each P-code to see the statement)

Aggregated GHS information provided per 88 reports by companies from 16 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.

Danger

Chemical: Carbonodithioic acid, O-ethyl ester, potassium salt

Carbonodithioic acid, O-ethyl ester, potassium salt (1:1) is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Carbonodithioic acid, O-ethyl ester, potassium salt (1:1) are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)

Status: Active Update: 21-08-2018 https://echa.europa.eu/registration-dossier/-/registered-dossier/11851

Causes somnolence and respiratory depression in oral lethal-dose studies of mice; Causes excitement and muscle contraction or spasticity in oral lethal-dose studies of rats; Causes changes in erythrocyte counts in 26-week oral studies of rats; [RTECS] A skin and strong eye irritant; Toxic by ingestion; [Alfa Aesar MSDS]

Flam. Sol. 1 (52.3%)

Skin irritation - category 2

CSL00205

3-[Ethoxylthiocarbonylthio]quinoline; Carbonodithioic acid, O-ethyl S-3-quinolinyl ester + Potassium ethylxanthate + 3-Aminoquinoline

I was attempting to prepare 3-[ethoxy(thiocarbonyl)thio]quinoline by reacting the diazonium salt of 3-aminoquinine with potassium ethyl xanthate when an explosion occurred. Thankfully, the injury I received was minor. I was following the procedure described in the Journal of the Chemical Society, Part III [3, 2384 (1959)] on twice their scale. Jerry March's book "Advanced Organic Chemistry: Reactions, Mechanisms, Structure" (New York: John Wiley & Sons, 1992, 4th edition, page 670) lists the procedure as a customary route for the desired aryl xanthate ester and a convenient method for producing thiophenols. The same procedure is also described in "Organic Syntheses, Collective Volume III" (New York: John Wiley & Sons, page 809. DOI: 10.15227/orgsyn.027.0081), which contains a cautionary note about a reported explosion, although the editors found no unusual reactivity. Since diazo esters were present, the explosion most likely resulted from the diazo ester's tendency to decompose explosively. It is unclear whether the diazo ester is a precursor of the desired product or whether the diazo ester forms through a competitive reaction. The reaction proceeded without event. But unlike the literature preparations, precipitation occurred during product extraction with diethyl ether and was isolated by filtration. A 1H NMR of the wet cake was consistent with the desired structure. The solid was air-dried overnight and weighed 17 g. The detonation occurred when a metal spatula was inserted into the solid. Related work in Tetrahedron Letters [26, 6365 (1985)] successfully demonstrated the safe preparation of diaryl sulfides. However, this was done at 25 ºC (mine at 45 ºC) with care taken to avoid heat, since a reference is cited of an explosion at 60 ºC. Also, the disappearance of the suspected diazo sulfide was monitored by thin layer chromatography, and sluggish reactions were not pushed to conversion. Instead, chromatography was used to remove any intermediates." (reprint of full text)

Explosive

Not Available

In the safety letter above, one substance name - - 3-aminoquinine- may be misspelled. The correct name is 3-Aminoquinoline. See Discussion section of: Cragoe, Edward J., Jr.; Robb, Charles M. 3-Hydroxyquinoline. Org. Synth. 1960, 40, 54. DOI: 10.15227/orgsyn.040.0054