1. Dale, G. H. and McKay, D. L. September 1977.Hydrocarbon ProcessingSeptember, 97–102.
2. 1969.International Tables for X-ray Crystallography, Vol. I, 79Birmingham, England: The Kynoch Press.
3. By flotation in aqueous KI
4. The function minimized was Σw(|Fo| - |Fc|).2Mean atomic scattering factors for all atoms, and real and imaginary dispersion corrections for all atoms except carbon were taken fromInternational Tables for X-ray Crystallography, Vol. IV, the Kynoch Press, Birmingham, England, 1974, p. 71, p. 148. The structural results reported are for the enantiomer having the lowestRw.