... Page 7. 2608 HELVETICA CHIMICA ACTA - Vol. 76 (1993) 2. Starting Materials. I+)- trans-I-Azido-2-iodocyclopentune (4a). ... 100° gave a total volume of cu. 90 ml of distillate which was extracted with Et20 (6 x 80 ml) and CH2C1, (40 ml). The combined org. ...