Summary
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1.
Phenyllithium and 1-naphthyllithium undergo 1,2-addition to the conjugated system of 3-methyl-6-phenyl-3, 5-hexadien-2-one with formation of the corresponding tertiary alcohols, which give arylhexatrienes by further reaction, on the other hand, 9- fluorenyllithium undergoes 1, 6-addition with this ketone with formation of the un saturated ketone 6 -fluorenyl-3-methyl-6-phenyl-5 -hexen-2 -one.
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2.
By the dehydration of 3-methyl-2,6-diphenyl-3,5-hexadien-2-ol, four stereoisomeric 4-methyl-1,5 diphenyl-1, 3,5-hexatrienes can be prepared.
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Mikhailov, B.M., Ter-Sarkisyan, G.S. Polyenic compounds communication 1. Synthesis of 1,5-diaryl-1,3,5-hexatrienes. Russ Chem Bull 5, 1095–1099 (1956). https://doi.org/10.1007/BF01177362
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DOI: https://doi.org/10.1007/BF01177362