Knowledge Bank

The microwave spectrum of 2,2-difluoro-1-methylcyclopropane has been studied in the range 8-38 gHz. Both ground and first excited methyl torsional states were assigned, and from splittings of the latter, the barrier to internal rotation was found to be $2260\pm 150$ calories/mole. The dipole moment components are $|\mu a|=2.03D,|\mu e|=1.19D$, and $|\mu e|=0.31D$.