4-hydroxy-3,6-dimethoxy-5H-benzo[7]annulen-5-one

6-methoxy-9-vinyl-5H-benzo[7]annulen-5-one

1-(2-ethynylphenyl)-2,2-dimethoxypent-4-en-1-one

2,2-dimethoxy-1-(2-vinylphenyl)pent-4-en-1-one