The ALMA-PILS survey: first detection of the unsaturated 3-carbon molecules Propenal (C2H3CHO) and Propylene (C3H6) towards IRAS 16293–2422 B

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Table B.2

Hydrogenation reactions of CH(O)CHO from Chuang et al. (2016) and CH₃OCHO on grain surfaces.

Reacting species		Produced species	BR
			(%)
s-H^(a) + s-HC(O)CHO	→	s-CH(OH)CHO	50
	→	s-CH₂(O)CHO	50
s-H + s-CH(OH)CHO	→	s-CH₂(OH)CHO	100
s-H + s-CH₂(O)CHO	→	s-CH₂(OH)CHO	100
s-H + s-CH₂(OH)CHO	→	s-CH₂(OH)CH₂O	50
	→	s-CH₂(OH)CHOH	50
s-H + s-CH₂(OH)CH₂O	→	s-(CH₂OH)₂	100
s-H + s-CH₂(OH)CHOH	→	s-(CH₂OH)₂	100
s-H + s-CH₃OCHO	→	s-CH₃OCH₂O	50
	→	s-CH₃OCHOH	50
s-H + s-CH₃OCH₂O	→	s-CH₃OCH₂OH	100
s-H + s-CH₃OCHOH	→	s-CH₃OCH₂OH	100

Notes. ^(a) The prefix “s-” means the species is in the solid phase, which corresponds to the ice surface and the ice mantle.

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