tert-butyl (2E,4E)-octa-2,4,6-trienoate

tert-butyl (E,E)-6-formylpenta-2,4-dienoate

(+)-isopropyl 2α-bromomethyl-5β-hydroxy-7-(hydroxymethyl)-4aβ,5,8,8a-tetrahydro-4H-1,3-benzodioxin-8aβ-carboxylate

tert-butyl (2R,4aR,7S,8aS)-2-bromomethyl-8a-isopropoxycarbonyl-4a,7,8,8a-tetrahydro-4H-1,3-benzodioxin-7-carboxylate