“…Pentacarbonyl(η 2 -cis-cyclooctene)chromium (0) (1), [11] 9-diazo-9H-fluorene (2), [10] ethyl α-diazophenylacetate (3), [16] (E)-1-ethoxy-2-methyl-1,3-butadiene (5), [21] 5-ethenyl-3,4-dihydro-2H-pyran (6) [22] (E)-2-methyl-1-(Ϫ)-menthoxy-1,3-butadiene (7), [14] (1E,1ЈR/S)-2-methyl-1-(1Ј-phenylethoxy)-1,3-butadiene (8), [14] were prepared according to literature procedures. All other chemicals were used as received from commercial sources.…”