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Figure 1
Projection diagrams of the isopropyl substituents in (IV)[link], showing that the average methyl vector (arrow) for one of the isopropyl groups resides in the −anti­clinal region of torsional space (left), while the other isopropyl group resides in the +anti­clinal region (right). Hence, the use here of the designation (+ac,−ac), where the + and − signs indicate positive and negative torsion angle values.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 65| Part 10| September 2009| Pages m391-m394
doi:10.1107/S0108270109034647
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