Tetrahydrofuran → CID 3084433

Temperature

-10 °C

In the same reaction apparatus as in Example 1, to 500 g of tetrahydrofuran was dropwise added, while maintaining the same at -10° C., a solution prepared by dissolving 0.75 g of sodium borofluoride in 105 g of 25% fuming sulfuric acid over a period of 40 minutes. After completion of this dropwise addition, the mixture was further subjected to reaction at -10° C. for one hour. The conversion of tetrahydrofuran in this reaction was 40%. Then, the reaction mixture was heated to 30° C. and further reacted for 2 hours. The conversion upon the termination of this reaction was 55%. There was observed neither solidification nor coloration of the reaction system throughout the reaction. Then, the polymerization product was treated in the same manner as in Example 1 to obtain colorless PTMG. The results of the analyses of this product and the catalytic efficiency α were as shown in Table 1.

1. customa solution prepared
2. additionAfter completion of this dropwise addition
3. customthe mixture was further subjected to reaction at -10° C. for one hour
4. temperatureThen, the reaction mixture was heated to 30° C.
5. customfurther reacted for 2 hours
6. customsolidification nor coloration of the reaction system throughout the reaction
7. additionThen, the polymerization product was treated in the same manner as in Example 1

ORD record

ord-2b7cf24105a44d698ef5fff6ab8d4578

Source dataset

uspto-grants-1983_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04371713