title: Benzene-1,3,5-triyl tris-(2,2-dimethyl-propanoate).
abstract: In the title compound, C(21)H(30)O(6), the three acet-oxy groups are essentially planar with their normals rotated by -57.75 (4), -62.36 (4) and 63.36 (4)° from the normal to the mean plane of the C(6) ring. The arrangement of carbonyl groups around the ring is of two groups 'up' and one 'down', and the propeller-style arrangement of substituent groups is spoiled with the plane of the 'down' group twisted in the opposite direction; all the C(ring)-O-C-CMe(3 )conformations are trans. In the crystal, aromatic π-π stacking occurs [centroid-centroid separation = 3.320 (1) Å]; the other main inter-molecular inter-action is a C-H⋯π-ring contact on the opposing side from the overlapped ring pairing; there are no short C-H⋯O contacts.
authors.affiliation: School of Chemistry, University of East Anglia, Norwich NR4 7TJ, England.
authors.forename: Alan H
authors.initials: AH
authors.lastname: Haines
authors.forename: David L
authors.initials: DL
authors.lastname: Hughes