Diazaphospholane is a related term of phospholane.

In organic compound terms the difference between phospholane and diazaphospholane

is that phospholane is a saturated, five-membered heterocycle having four carbon atoms and one phosphorus atom; any derivative of this compound while diazaphospholane is a saturated, five-membered heterocycle having two carbon atoms, two nitrogen atoms and one phosphorus atom; any derivative of this compound.