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Có 21 đồng phân este mạch hở:
HCOO-CH2-CH2-CH=CH2
HCOO-CH2-CH=CH-CH2 (Cis-Trans)
HCOO-CH=CH-CH2-CH3 (Cis-Trans)
HCOO-CH2-CH(CH3)=CH2
HCOO-CH=C(CH3)3
HCOO-CH(CH3)-CH=CH2
HCOO-C(CH3)=CH-CH3 (Cis-Trans)
HCOO-C(C2H5)=CH2
CH3-COO-CH2-CH=CH2
CH3-COO-CH=CH-CH3 (Cis-Trans)
CH3-COO-C(CH3)=CH2
CH3-CH2-COO-CH=CH2
CH2=CH-COO-CH2-CH3
CH2=CH-CH2-COO-CH3
CH3-CH=CH-COO-CH3 (Cis-Trans)
CH2=C(CH3)-COO-CH3
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