... Advanced search. Other users also viewed these articles. Opens document download manager. Do not show again. Downloading zip file containing 3 articles... JavaScript is disabled on your browser. Please enable JavaScript to use all the features on this page. Tetrahedron Letters. Volume 21, Issue 12, 1980, Pages 1169–1172. Cover image Cover image. A direct three-carbon annelation to cyclopentenone derivatives. ... T. Imoto; Tetrahedron Lett. (1979), p. 3457 ...