ISSN:
0538-8066
Keywords:
Chemistry
;
Physical Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The reaction of 1-butanethiol with hydrogen atoms was investigated at room temperature under pressures of 133, 266, 532, 2660, and 5320 Pa, using two types of fast-flow discharge reactors; the main products were n-butane and 1-butene with total yields of more than 90%. In the reaction of 1-butanethiol and deuterium atoms, monodeuterated 1-butanethiol was observed by a photo-ionizing mass spectrometer. The relative rate of the two initial reactions of 1-butanethiol with hydrogen atoms was 0.272 (k1/k2). The n-butane and 1-butene are considered to be produced via chemically activated 1-butanethiol on the basis of the pressure dependence of the two main products.\scriptfont4=\seveni \scriptscriptfont4=\fivei \halign{\hfill $#$&$#$\hfill &$#$\hfill &\hfill\qquad\qquad #\cr\rm 1\hbox{-}C_{4}H_{9}S&\rm H&\rm +H\longrightarrow 1\hbox{-}C_{4}H_{9}\cdot +H_{2}S& (1)\cr \rm 1\hbox{-}C_{4}H_{9}S&\rm H&\rm +H\longrightarrow 1\hbox{-}C_{4}H_{9}S\cdot +H_{2}& (2)\cr\rm 1\hbox{-}C_{4}H_{9}S&\rm \cdot &\rm +H\longrightarrow 1\hbox{-}C_{4}H_{9}SH\ast & (3)\cr } \bigskip\rm{}Relative rates of molecular elimination of hydrogen sulfide and C—S bond fission for the chemically activated 1-butanethiol, k5/k4 and k6/k4, were 0.114 and 0.0552 under 532 Pa of pressure at room temperature. Activation energies of the two reactions were calculated to be 228 [kJ/mol] and 297 [kJ/mol], respectively, by use of RRKM on the base of estimated A factors.\scriptfont4=\seveni \scriptscriptfont4=\fivei \halign{\hfill $#$&$#$\hfill &$#$\hfill &\hfill\qquad\qquad #\cr\rm 1\hbox{-}C_{4}H_{9}SH\ast +M&\rm \longrightarrow &\rm 1\hbox{-}C_{4}H_{9}SH& (4)\cr \rm 1\hbox{-}C_{4}H_{9}SH\ast &\rm \longrightarrow &\rm 1\hbox{-}C_{4}H_{8}+H_{2}S& (5)\cr\rm 1\hbox{-}C_{4}H_{9}SH\ast &\rm \longrightarrow &\rm 1\hbox{-}C_{4}H_{9}\cdot +HS\cdot & (6)\cr } \bigskip\rm{}© 1998 John Wiley & Sons, Inc. Int. J. Chem Kinet 30: 923-932, 1998
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
Permalink
