Di(1-naphthyl)ketals of 1, n-diols show couplet effects allied to the (1)B naphthalene transition in their CD spectra. This means that they assume a conformation with a prevailing sense of twist of the naphthalene rings, imposed by the absolute configuration (AC) of the starting diols and by the nature of the R 1 groups. A positive couplet for aliphatic diols is a probe of ( R, R), AC while the opposite sign is found for ( R, R) aromatic diols.
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