A convenient preparative method of obtaining 2,2,4,5,5-pentaalkyl-δ- valerolactones 2a-d or 2,2,4,4-tetraalkyl-γ-butyrolactones 4a-e by the acid-catalyzed lactonization of 3-cyclopropylalkanoic acids, and for obtaining bicyclo-γ-lactones 6a-d from bicyclic 2-cyclopropylalkanoic acids 5a-d is presented.