Generation and Trapping of Ketenes in Flow.
Generation and Trapping of Ketenes in Flow.
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DOI:
10.1002/ejoc.201403603
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发表时间:
2015-03
影响因子:
2.8
通讯作者:
Whitby, Richard J.
中科院分区:
文献类型:
--
作者:
Henry, Cyril;Bolien, David;Ibanescu, Bogdan;Bloodworth, Sally;Harrowven, David C.;Zhang, Xunli;Craven, Andy;Sneddon, Helen F.;Whitby, Richard J.
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.
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影响因子:
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影响因子:
2.8
作者:
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DOI:
10.3891/acta.chem.scand.52-0549
发表时间:
1998-05-01
期刊:
ACTA CHEMICA SCANDINAVICA
影响因子:
--
作者:
Dias, M;Gibson, M;Hammerich, O
通讯作者:
Hammerich, O