The condensate from Curie-point pyrolysis of cellulose has been examined as the permethylated derivative and as the borodeuteride-reduced permethylated derivative. The main complete sugar peaks were identified as levoglucosan and cellobiosan. Fragments were also identified which were derived from reverse aldolisation cleavage of a sugar ring to leave acetaldehyde fragments on the reducing and non-reducing ends of intact sugar units. No peaks of significant intensity could be identified as anhydrosugar units with attached ring cleavage fragments.

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Journal J. Anal. Appl. Pyrolysis
Lomax, J. A, Commandeur, J. M, Arisz, P. W. F, & Boon, J. J. (1991). Characterisation of oligomers and sugar ring-cleavage products in the pyrolysate of cellulose. J. Anal. Appl. Pyrolysis, 19, 65–79. doi:10.1016/0165-2370(91)80035-7