Methanediol CH2(OH)2 and hydroxymethyl CH2OH+: key organic intermediates on the path to complex organic molecules

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Table 1.

Chemical pathways obtained from a (CH₃OH)₁₀ ice mantle in collision with a OH⁺ projectile with kinetic energy of 10–22 eV.

Reaction N^o	Steps	Products	Impact Energy [eV]

(CH₃OH)₁₀ + OH⁺
1	1.1	CH₂(OH)₂ + H⁺^(a)	10, 15, 18
2	2.1	CH₂(OH)₂ + H⁺
	2.2	:C(OH)₂ + H₂ + H⁺	20
3	3.1	CH₃OH…OH⁺^[1]
	3.2	H₂CO…OH⁺^[2] + H₂ + CH₃OH ^[2]
	3.3	CH₃OH ^[2] + OH⁺^[2]
	3.4	CH₂(OH)₂ + H⁺^[2]
	3.5	HCOH^[2] + H₂O^[2] + H₂CO+H^+[2] + H₂	22

4	4.1	CH₂OH⁺^[1] + H₂O + CH₃OH ^[2]
	4.2	[CH₃O − − − −CH₂OH]⁺ + H₂O
	4.3	CH₃OCH₂OH + H₂O + H⁺^(a)	10, 12, 15, 18
5	5.1	CH₂OH⁺ + H₂O
	5.2	HCO⁺ + H₂ + H₂O
	5.3	CO + H₂ + H₂O + H⁺^(a)	12, 18, 20

Notes. ^[1]Indicates the OH⁺ projectile. ^[2]Indicate the second methanol molecules involved in the reactions, as well as the origin of their products.

^(a)

Corresponds to a proton stabilized by hydrogen bonds with methanol molecules of the ice mantle in a [H...OH...OH...OH]⁺ fashion.

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