A dicobalt hexacarbonyl(a1kyne) moiety is used as a stereocontrol element in Friedel-Crafts cycloalkylation reactions that deliver cis-4a-ethynyl-1,2,3,4,4a,9,10,1 Oa-octa hydrop henanth renes exclusively.
Reaction of the N‐acylimidazoles (I) with the sodium salt (II) derived from nitromethane gives the nitro ketones (III) which are transformed into a mixture of the (phenylthio)nitroalkenes (VI) and (VII) via the nitro dithioacetals (V).
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