Solvent-free Michael addition of 2-cyclohexenone under ultrasonic irradiation in the presence of long chain dicationic ammonium salts


Öge A., Maviş M. E. , YOLAÇAN Ç. , AYDOĞAN F.

TURKISH JOURNAL OF CHEMISTRY, cilt.36, ss.137-146, 2012 (SCI İndekslerine Giren Dergi)

  • Cilt numarası: 36 Konu: 1
  • Basım Tarihi: 2012
  • Doi Numarası: 10.3906/kim-1104-63
  • Dergi Adı: TURKISH JOURNAL OF CHEMISTRY
  • Sayfa Sayısı: ss.137-146

Özet

Long chain dicationic ammonium salts (1a-1c), easily prepared from tert-amines and dihaloalkanes, were successfully used as efficient phase-transfer catalysts in the Michael addition reaction of various active methylene compounds to 2-cyclohexenone without solvent under ultrasonic irradiation. The investigated dicationic salts were more effective than monocationic tetrabutylammonium bromide, with short reaction times and high yields. This methodology was established under phase-transfer catalytic conditions and ultrasonic effects with many advantages, including the easy and cost-effective synthesis of the catalyst, mild reaction conditions, short reaction times, good yields, simple work-up procedures. and environmental friendliness.