5299-35-4Relevant articles and documents
Generation and trapping of ketenes in flow
Henry, Cyril,Bolien, David,Ibanescu, Bogdan,Bloodworth, Sally,Harrowven, David C.,Zhang, Xunli,Craven, Andy,Sneddon, Helen F.,Whitby, Richard J.
, p. 1491 - 1499 (2015/03/04)
Ketenes were generated by the thermolysis of alkoxyalkynes under flow conditions, and then trapped with amines and alcohols to cleanly give amides and esters. For a 10 min reaction time, temperatures of 180, 160, and 140 °C were required for >95% conversion of EtO, iPrO, and tBuO alkoxyalkynes, respectively. Variation of the temperature and flow rate with inline monitoring of the output by IR spectroscopy allowed the kinetic parameters for the conversion of 1-ethoxy-1-octyne to be easily estimated (Ea = 105.4 kJ/mol). Trapping of the in-situ-generated ketenes by alcohols to give esters required the addition of a tertiary amine catalyst to prevent competitive [2+2] addition of the ketene to the alkoxyalkyne precursor.
Tighter ion pair effect and scale-up study in microwave assisted aminolysis of enolizable esters using potassium tert-butoxide (t-BuOK)
Polshettiwar, Vivek,Kaushik
, p. 773 - 777 (2007/10/03)
The tighter ion pair effect and scale-up study in aminolysis of enolizable esters using potassium tert-butoxide (t-BuOK) under microwave irradiations is described. This method provides synthetic advantages in terms of reaction time, product yields, eco-friendly environment and scale-up feasibility over the conventional heating method.
