Page 1. SYNTHETIC COMMUNICATIONS, 22(5), 773-782 (1992) ... The ether was distilled off to the reduced volume of the reaction mixture ca 10ml. ... 5-Cyclopropyl-2-thiouracil 5-Cyclopropyl- 2-thiouracil (256mg, 18%) was prepared from 1,14g of 111 (97% purity) according to ...