Page 1. SYNTHETIC COMMUNICATIONS, 10(7), 529-540 (1980) AN IMPROVED SYNTHESIS OF S-3,4-DEHYDROPROLINE * John W. Scott , Antonio Focella, Urs 0. Hengartner, David R. Parrish and Donald Valentine, Jr. ... The volume of ca. 650 mL. ... 6. 7. 8. 9. 10. 11. 12, 13. 14. ...