✍ Scribed by Joseph N. Noah; Robert E. Prud'Homme
No coin nor oath required. For personal study only.
P. 81 2, Yaoudi., Cameroun, and 'Centre d e Recherche e n Sciences e t IngGnierie d e s Macromolkcules, Departement d e Chimie, Universiti. Laval, Sainte-Foy (Quebec) GI K 7P4, Canada
Fraki., a tropical wood species from Cameroon, was reacted with 1% periodic acid solution at room temperature for 24 h. Untreated and treated woods were analyzed by ESCA. As expected, O,, and CtS were the predominant species in the spectra. While the 01, peak is featureless, the CIS peak can be decomposed into several components. These contributions were calculated, and it was observed that untreated and treated woods exhibit carbon atoms in classes C, (carbon atoms bonded by a C -C or a C -H bond), C, (carbon atoms bonded by a C -0 bond), and C3 (carbon atoms bonded by a C = 0 or by a 0 -C -0 bond). Class C,, which refers to carbon atoms bonded by 0 -C = 0 bonds, is completely absent. The periodic acid treatment produces a reduction in C, , an increase in C p , with C3 remaining relatively small. Accordingly, the expected oxidation of hydroxyl groups to carbonyl groups is not observed. It can be postulated that wood-periodic acid intermediates, which are believed to be cyclic periodic esters, do not decompose to form carbonyl groups but rather remain as stable complexes.
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