... Please enable JavaScript to use all the features on this page. Tetrahedron Letters. Volume 45, Issue 4, 19 January 2004, Pages 685–687. Cover image Cover image. ... 4-CH 3, 82/18, 99.9/0.1, N/A, 92/8. 4-OMe, 77/23, >99.9/<0.1, 72/28, N/A. N/A: Product and by-product are identical ...