I know two references giving different Low-Temperature baths :
- Baths pouring liquid nitrogen into a solvent : R.E. Randeau, J. Chem.
Eng. Data, 11, 124 (1966)
- Baths involving adition of dry ice : A.M. Phipps and D.N. Hume, J. Chem.
Educ., 45, 664, (1968)

Exemple :
-98°C : Methanol + N2
- 100°C : Diethyl ether + CO2
All the proposed solutions are not very convenient to use....


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