반응 #214333

반응 방정식

2-methyl-2-hydroxy-butan-3-one

aniline

acetic acid

toluene

→

2,3,3-trimethyl-indolenine

용매

water

water

반응 조건

후처리

1. 1
   workup.DISTILLATIONThe volatile constituents are then distilled off until the internal temperature
2. 2
   기타reaches 220° C
3. 3
   workup.ADDITION40 parts of concentrated hydrochloric acid are added
4. 4
   온도After heating for a further three hours, during which the water
5. 5
   기타formed
6. 6
   기타distils off
7. 7
   workup.DISTILLATIONdistilled

실험 절차

408 parts of 2-methyl-2-hydroxy-butan-3-one, 558 parts of aniline and 20 parts of acetic acid in 650 parts of toluene are heated, with removal of water from the system, until no more water separates off. The volatile constituents are then distilled off until the internal temperature reaches 220° C. The distillate can be re-used, without further treatment, in a subsequent batch. The residue is kept for 5 hours at 220° C. and is then cooled to 160° C., and 40 parts of concentrated hydrochloric acid are added. After heating for a further three hours, during which the water formed distils off, the reaction is complete. The product is either directly processed further or distilled. 498 parts of 2,3,3-trimethyl-indolenine are obtained, corresponding to 78.5% of theory, based on 2-methyl-2-hydroxy-butan-3-one.

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