(Z)-1,1-dimethoxyoct-3-ene-2,5-dione

2-dimethoxymethyl-5-n-propyl-2,5-dimethoxy-2,5-dihydrofuran

3-dimethoxymethyl-3-hydroxy-2-ethylcyclopentan-1-one

1-[(tert-butyldimethylsilyl)-oxy]-2-pentyne

3-(((tert-butyl)dimethylsilyloxy)methyl)-2-ethylcyclopent-2-enone