The first step involves a ring enlargement, where the smaller cyclic structure is transformed into a larger one. This can be achieved by using a cationic catalyst, which initiates the expansion of the ring. The cationic catalyst might be an acid, such as sulfuric acid, or another Lewis acid.
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6-(trimethylsilyl)-1-(1'-phenylthiocyclopropyl)hex-5-yn-1-ol
(5S)-5,6-dideoxy-1,2-O-isopropylidene-5-C-<(RS)-phenylphosphinyl>-α-D-xylo-hexofuranose
5,5-dimethyl-1-phenylcyclopentene
