Tetrahydrofuran → CID 3084433

Temperature

250 °C

Into a 300 ml vessel equipped with a stirrer and a reflux condenser, 200 g of THF with a water content of 2.0 wt. % was charged and 100 g of an anhydrous 12-tungstosilicic acid which had been prepared by heating in an electric furnace at a temperature of 250° C. for 3 hours was added thereto (the molar ratio of water existing in the catalyst phase to the heteropoly-acid corresponds to 5.8). After stirring was continued at 50° C. for 4 hours, according to the same procedure as described in Example 1, a PTMG with a number-average molecular weight of 1100 was obtained at a yield of 8%.

1. customInto a 300 ml vessel equipped with a stirrer and a reflux condenser
2. additionwas added

ORD record

ord-bdf8c8f68999490ba969e4fc49b4b5e6

Source dataset

uspto-grants-1986_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04568775