Electron Transfer Reactions in Pulping Systems (IV): An Example of a Large Reactivity Difference for Fragmentation of a β-ARYL Ether Bond by AHQ−2and HS−
- 1 January 1987
- journal article
- research article
- Published by Taylor & Francis in Journal of Wood Chemistry and Technology
- Vol. 7 (1) , 97-113
- https://doi.org/10.1080/02773818708085255
Abstract
A lignin model (3E) with a propanol group on the β-carbon has been heated In alkali with no additives and with NaSH and anthrahydroquinone (AHQ) additives. The β-aryl ether bond of the model is efficiently fragmented by AHQ, but not by NaSH or simple NaOH. A competing cyclization of the propanol group with the quinonemethide of the model interferes with NaOH and NaSH fragmentation reactions. The data suggest that AHQ reacts by way of a mechanism different from that of NaSH - the AHQ by an electron transfer mechanism and the NaSH by an adduct mechanism. The reactions of β-allyl (3D) and β-propyl trityloxy (3F) models were also performed. The fragmentation efficiencies In these cases ware: AHQ > NaSH > NaOH.This publication has 11 references indexed in Scilit:
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