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The reaction of the octadienylether of xylosyle and of its peracetylated form in the presence of Grubbs catalysts has led to O-allyl carbohydrates, and from the protected carbohydrate, to the bolaform with a C 4 tether. The concomitant formation of cyclopentene, highlighted from analysis of the crude reaction by mass spectroscopy, led to propose a mechanistic scheme involving both double bonds...
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