| abstract |
According to one embodiment, the present invention provides a refrigerator oil containing a lubricant base oil and a compound represented by formula (A), the refrigerator oil being used together with refrigerants that contain unsaturated hydrofluorocarbons. [Formula 1] [In the formula, R 1 and R 2 each independently represent a monovalent hydrocarbon group, and R 3 and R 4 each independently represent a hydrogen atom or alkyl group.] |