Summary
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1.
A general method has been developed for the preparation ofa,β-unsaturated cyclic ketones. There are two stages: bromination of a cyclic ketone in presence of calcium or magnesium carbonate; and elimination of hydrogen bromide from the bromo ketone formed, which is effected by heating it in presence of diethylaniline.
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2.
2-Methyl-2-cyclohexen-1-one (58% yield), 2-methyl-2-cyclopenten-1-one (50% yield), 2-cyclohexen-1-one (35% yield), and 2-cyclopentea-1-one (25% yield) have been prepared by this method.
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3.
It has been proved that, in the bromination of 2-methylpyclohexanone and of 2-methylcyclopentanone, bromine attacks the tertiary carbon atom, and not a secondary carbon, as assured previously by some workers.
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4.
The method of preparing 2,4-dimethyl-2-cyclopenten-1-one has been simplified and improved.
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Nazarov, I.N., Bergelson, L.D., Torgov, I.V. et al. Synthesis of steroid compounds and related substances Communication XVII. Preparation ofa,β-unsaturated cyclic ketones (2-cycloalken-1-ones). Russ Chem Bull 2, 787–798 (1953). https://doi.org/10.1007/BF01178858
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DOI: https://doi.org/10.1007/BF01178858