... Please enable JavaScript to use all the features on this page. Tetrahedron Letters. Volume 52, Issue 51, 21 December 2011, Pages 6968–6970. Cover image Cover image. ... 3, i PrBisoxa/Cu(OAc) 2, IPA, 25/48, 62:29:4:5, 76. 4, t BuBisoxa/Cu(OAc) 2, IPA, 25/48, 52:38:01: ...