1256 J. Org. C'hent., Vol. 43, No. 6, 1978 Notes generated using the direct method program MULTAN. 5 All nonhydrogen atoms were located on the first E map. Full matrix least- squares refinement of positional and isotropic thermal parameters of nonhydrogen atoms reduced R to 0.184. Anisotropic refinement brought R down to 0.065. A difference map at this stage revealed all the hydrogens and two more cycles of refinement (anisotropic for ...
