“…1-Ethynylcyclopent-1-ene, 1-ethynylcyclohex-1-ene, 1-ethynylcyclohept-1-ene, 1-ethynylcyclooct-1-ene, 5,6-dihydro-2 H -pyran-3-carbaldehyde, 1-tosyl-1,2,3,6-tetrahydropyridine-4-carbaldehyde, 9h , 10 , 11 , 9j , and 9k were prepared as previously described. Perillaldehyde and 3-(allyloxy)-1-propyne 9i are commercially available.…”