Rahul Sharma (Editor)

1,3,5 Trithiane

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Formula  C3H6S3
Appearance  Colourless solid
Density  1.64 g/cm³
1,3,5-Trithiane wwwsigmaaldrichcomcontentdamsigmaaldrichstr

1,3,5-Trithiane is the chemical compound with the formula (CH2S)3. This heterocycle is the cyclic trimer of the otherwise unstable species thioformaldehyde. It consists of a six-membered ring with alternating methylene bridges and thioether groups. It is prepared by treatment of formaldehyde with hydrogen sulfide.

Trithiane is a building block molecule in organic synthesis, being a masked source of formaldehyde. In one application, it is deprotonated with organolithium reagents to give the lithium derivative, which can be alkylated.

(CH2S)3 + RLi → (CH2S)2(CHLiS) + RH (CH2S)2(CHLiS) + R’Br → (CH2S)2(CHR’S) + LiBr (CH2S)2(CHR’S) + H2O → R’CHO + ….

Trithiane is the dithioacetal of formaldehyde. Other dithioacetals undergo similar reactions to the above.

It is also a precursor to other organosulfur reagents. For example, chlorination in the presence of water affords the chloromethyl sulfonyl chloride:

(CH2S)3 + 9 Cl2 + 6 H2O → 3 ClCH2SO2Cl + 12 HCl


Trithiane is the parent of a class of heterocycles called trithianes. The species often arise from thiation of ketones and aldehydes. The incipient thioketones and thioaldehydes suffer trimerization. The reaction is reversed thermally.


1,3,5-Trithiane Wikipedia

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