... Chemistry – A European Journal: Previous article ... a and 3 b were mildly shielded (Δ∼0.4 ppm) by the ether oxygen atom, whereas the equatorial protons (H 4a ) are strongly deshielded, appearing 1.3 ppm downfield of analogous protons of 1.15 Similar chemical shifts effects ...
[Stoermer, Martin J.; Butler, Douglas N.; Warrener, Ronald N.; Weerasuria; Fairlie, David P. Chemistry - A European Journal, 2003 , vol. 9, # 9 p. 2068 - 2071]
