865-36-1

Basic information

• Product Name: thioformaldehyde
• Synonyms: thioformaldehyde;Formthialdehyde;Methanethione;Thioxomethane
• CAS NO: 865-36-1
• Molecular Formula: CH₂S
• Molecular Weight: 46.0916
• Mol File: 865-36-1.mol
• Article Data: 33

Chemical Properties

• Boiling Point: 3.3°Cat760mmHg
• Flash Point: °C
• Appearance: /
• Density: 0.891g/cm³
• CAS DataBase Reference: thioformaldehyde(CAS DataBase Reference)
• NIST Chemistry Reference: thioformaldehyde(865-36-1)
• EPA Substance Registry System: thioformaldehyde(865-36-1)

Safety Data

• Hazardous Substances Data: 865-36-1(Hazardous Substances Data)

Upstream product

• 287-27-4 trimethylene sulphide 
• 10304-16-2 3-thietanol 
• 505-23-7 1,3 dithiane 
• 18555-26-5 methylene trithiocarbonate 
• 289-16-7 1,2,4-trithiolane 
• 5813-48-9 Methanesulfenyl chloride 
• 10152-76-8 allylmethyl sulfide 
• 81214-73-5 2-Methylen-1,3-dithietan 
• 81214-76-8 2-Cyclopentadienyliden-1,3-dithietan 
• 5650-74-8 5-methyldihydrothiophen-2(3H)-one 
• 434-45-7 2,2,2-Trifluoroacetophenone 
• 71928-47-7 CH₂S^(1-) 
• 75-15-0 carbon disulfide 
• 64-19-7 acetic acid 

Downstream Products

• 10019-24-6 1,1,2,2-tetrakis(4-methoxyphenyl)ethene 
• 126797-41-9 (3aS,4aR,7R,8aR,9S,9aR)-9-Methoxy-7-phenyl-hexahydro-[1,3]dioxolo[4',5':5,6]pyrano[3,2-d][1,3]dioxine-2-thione 
• 126797-40-8 (3aR,4aR,7R,8aR,9S,9aR)-9-Methoxy-7-phenyl-hexahydro-[1,3]dioxolo[4',5':5,6]pyrano[3,2-d][1,3]dioxine-2-thione 
• 89000-82-8 1,2-O-thiocarbonate-3,5-di-O-benzyl-α/β-D-xylofuranose 
• 137812-07-8 4-methoxy-2H-thiopyran-6(3H,6H)-one 

Relevant articles and documents

Thermal Decomposition Mechanism for Ethanethiol

The thermal decomposition of ethanethiol was studied using a 1 mm x 2 cm pulsed silicon carbide microtubular reactor, CH3CH2SH + Δ → Products. Unlike previous studies these experiments were able to identify the initial ethanethiol decomposition products. Ethanethiol was entrained in either an Ar or a He carrier gas, passed through a heated (300-1700 K) SiC microtubular reactor (roughly ≤100 μs residence time) and exited into a vacuum chamber. Within one reactor diameter the gas cools to less than 50 K rotationally, and all reactions cease. The resultant molecular beam was probed by photoionization mass spectroscopy and IR spectroscopy. Ethanethiol was found to undergo unimolecular decomposition by three pathways: CH3CH2SH → (1) CH3CH2 + SH, (2) CH3 + H2C=S, and (3) H2C=CH2 + H2S. The experimental findings are in good agreement with electronic structure calculations. (Chemical Equation Presented).

Thermal reactions of regioisomeric 1,2,4-trithiolane s-oxides

The products of the gas-phase pyrolysis of two regioisomeric 1,2,4-trithiolane S-oxides were collected in an argon matrix at 1OK and studied by means of spectroscopic as well as computational methods. Whereas the main products of the pyrolysis of the symmetrical S-oxide were identified as thioformaldehyde S-oxide and thioformaldehyde S-sulfide, the non-symmetrical S-oxide gave predominantly dithioformic acid, which exists as a mixture of s-cis and s-trans conformers. We present a rationalization of the reaction pathways including density functional theory computations.

Thioformaldehyde S-sulfide (Thiosulfine)

Matrix isolation spectroscopy allows the direct identification of ylide 1 and its cyclic isomer 2. They were obtained by pyrolysis of 1,2,4-trithiolane under high vacuum; the cyclic compound forms from 1 by thermal ring closure in a kinetically controlled reaction.