ethyl 2-(triphenyl-λ⁵-phosphanylidene)pentanoate

ethyl 2-methylbuta-2,3-dienoate

ethyl 9-oxodec-2-enoate

ethyl 3-(5-bromo-1-benzofuran-2-yl)prop-2-enoate

ethyl 2-(3-oxo-1,2-dihydroinden-2-yl)acetate