ethyl 3-(diethoxymethyl)-7-methylocta-2,6-dienoate

1,1-diethoxy-6-methylhept-5-en-2-one

1,1-diethoxy-6,10-dimethylundeca-5,9-dien-2-one

ethyl 3-amino-4,4-diethoxybut-2-enoate

ethyl 4,4-diethoxy-3-oxo-2-(thiophen-2-ylmethylidene)butanoate