ethyl 4-[2-(4-ethoxycarbonylphenyl)ethynyl]benzoate

trimethyl-[2-[2-(3-methylbut-2-enyl)phenyl]ethynyl]silane

5-methyl-5-prop-1-en-2-yl-2-trimethylsilylcyclopent-2-en-1-one

5-(1-chlor-1-methylaethyl)-5-methyl-2-(trimethylsilyl)-2-cyclopenten-1-on

5-(1-chlor-1-methylaethyl)-3,5-dimethyl-2-cyclopenten-1-on