... Tetrahedron Letters. Volume 32, Issue 11, 11 March 1991, Pages 1503–1506. Cover image Cover image. ... 10; HC Brown, US Racherla, PJ Pellechia; For a recent example of the use of 11 B NMR to follow the conversion of boronate to borate, see J. Org. Chem., 55 (1990), p. 1868 ...