To give an oil, was added n-heptane (129.6kg) at 5-10 deg.] C to cooling crystallization, stirred for 2 hours, filtered to give a pale yellow solid 85kg. Yield: 75%. (5h)
The oil was obtained by adding n-heptane (129.6kg) to cool to 5-10 ℃, crystallizing, stirring for 2 hours, filtering, and obtaining 85kg light yellow solid. Yield: 75%. (5H)