Reactions of 2-methylcyclopentanone and of 2-methylcyclohexanone with formaldehyde

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  • 2-メチルシクロペンタノン,2-メチルシクロヘキサノンとホルムアルデヒドとの反応
  • 2 メチルシクロペンタノン 2 メチルシクロヘキサノン ト ホルムアルデヒド トノ ハンノウ

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The acid-catarized reaction of 2-methylcyclopentanone[1]and that of 2-methyleyclohexanone[2]with formaldehyde were investigated. The reaction of[1]with formaldehyde gave only methylol compounds and the formation of ring-ether compounds were not recognized at all. The reaction of[2]with formaldehyde afforded the methylol compounds and the ring-ether compounds. It is believed to be due to the ringstructure of cycloalkanone and the substituent that the reaction of[1]with formaldehyde did not give a ring-ether compund. Moreover by fixing the enolic double bond of[2], the preparing amounts of the ring-ether compounds were greatly increased.

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