9-t-Butyl-9,10-Dihydroanthracene; Modified Tangent Procedure
The modified tangent procedure (VII, (2.4)) has been shown to result in more accurate phasing than the simple tangent formula (VII, (1.15)) when applied to the data for three solved steroid crystal structures (VII, §3 and §4). However, the simple tangent formula had been adequate to solve these structures and, based on these results alone, it was questionable whether the modified tangent procedure would allow for a structure solution in a case where the tangent formula itself was unsuccessful. The analysis of 9-t-butyl-9,10-dihydroanthracene (C18H20), a hydrocarbon crystallizing in space group P212121, provided an example where this situation occurred.
KeywordsTriple Product Average Absolute Deviation Phase Assignment Pair Relationship Chapter XIII
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