A methoxymethyl group (CH 3 OCH 2 -) can exert the polar effect on the physical and electrochemical properties. We have investigated the effect of the substitution of a methyl group with a methoxymethyl group on the physical and electrolytic properties of propylene carbonate (PC or 4-methyl-1,3-dioxolan-2-one). The molar concentration of methoxypropylene carbonate (MetPC or 4-methoxymehyl-1,3-dioxolan-2-one) in an electrolytic solution was lower than that of PC. The viscosities of the electrolytic solutions in MetPC were considerably higher than those of the counterparts in PC. The ionic conductivity of the electrolytic solution was lower in MetPC. Nevertheless, the use of MetPC as an alternative single solvent led to the gravimetric capacitance comparable to that obtained for PC in the discharge of a measurement cell.