Trapp mixture

The Trapp mixture is a specific mixture of organic solvents for chemical reactions taking place at very low temperatures. The mixture THF:diethyl ether: pentane (4:4:1) is a liquid down to -110 °C and the same (4:1:1) mixture is liquid down to −120 °C. Note that pure THF melts at −108.4 °C.

References

1. Köbrich, G.; Trapp, H. (1966). "Darstellung und thermische Stabilität von 1-Chlor-2.2-diaryl-vinyllithium-Verbindungen". Chem. Ber. 99 (2): 680. doi:10.1002/cber.19660990243.