... A VERSATILE AN0 CONCISE ROUTE TO FUNCTIONALLY SUBSTITUTE0 Y-BUTYRO- LACTONES ANO SPIRO- X-BUTYROLACT~NES (LACT~NE ANNELATION) Arun K. Mandal* and OG Jawalkar Alchemie Research Centre, CAFI Site, PO Box 155, Thane-Belapur Road, Thane 400 601, Maharashtra, India. Summary : A novel route to the synthesis OP Punctionally substituted X-butyro- ...