Jk. Mukhopadhyaya et al., ELECTRON-TRANSFER-INDUCED REDUCTIVE CLEAVAGE OF GAMMA-LACTONES TO CARBOXYLIC-ACIDS BY SODIUM-HEXAMETHYLPHOSPHORIC TRIAMIDE (HMPA), Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 33(2), 1994, pp. 132-136
Sodium-hexamethylphosphoric triamide (HMPA) mediated electron transfer
induced reductive cleavage of 1-->3 and 1-->2 lambda-lactones fused i
n cyclohexane ring gives the corresponding carboxylic acids in good yi
elds.