Trialkyloxonium ion mechanism

Scheme 8 [30] shows that a stereoregular structure entirely consisting of (1 -+5)-a-D-glucofuranosidic units can be obtained by the trialkyloxonium ion mechanism (path c). Probably the selective 1,5-ring opening of 22 occurs from the 1,5-linked... 

Figure 5. Trialkyloxonium ion mechanism in the ring-opening polymerization of 1,6-anhydro sugar derivatives leading to stereoregular (l- )-a-D-glucopyranans.

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