Dj. Collins et al., THE CONFORMATION OF CRYSTALLINE (4'-METHOXYPHENYL)-2,2,4,4-TETRAMETHYLPENTAN-3-YL] OXALATE, Australian Journal of Chemistry, 49(10), 1996, pp. 1171-1174
(4'-methoxyphenyl)-2,2,4,4-tetramethylpentan-3-yl] oxalate (4a) and th
e analogous bis tetrahydropyranyl ether (4b) have been synthesized, an
d X-ray crystallography of the former shows an almost symmetrically st
aggered relationship of the t-butyl groups with respect to the plane o
f the benzene ring.