Chirochromic triggers: 3,3′-Disubstituted-2,2′-binaphthalene-1,1′-diols and 2-methylindoline derived phosphoramidates

Diastereomeric binaphthalenes with an appropriate barrier to atropisomerization were sought in an effort to develop possible chirochromic switches that photochemically control the pitch magnitude and sense in an induced cholesteric liquid crystal.