a cis-alkene + CO2 => a cis-3-alkyl-4-alkyloxetan-2-one
a cis-alkene + co2 => a cis-3-alkyl-4-alkyloxetan-2-one
a cis-alkene + CO2 => a cis-3-alkyl-4-alkyloxetan-2-one
a cis-alkene + co2 => a cis-3-alkyl-4-alkyloxetan-2-one