Butane thiol

The pressure dependence of the reaction between butane-1-thiol and hydrogen atoms at 133, 266, 532, 2660, and 5320 Pa, using two types of fast-flow discharge reactors, have been studied. Butane and but-l-ene were the main products. Pressure dependence indicated decomposition through vibrationally activated species. 

Cognate preparation. Butane-1-thiol. Use 51 g (40 ml, 0.372 mol) of butyl bromide (Expt 5.54), 38 g (0.5 mol) of thiourea and 25 ml of water. Reflux, with stirring, for 3 hours the mixture becomes homogeneous after 1 hour. Allow to cool and separate the upper layer of the thiol (A). Acidify the aqueous layer with a cold solution of 7 ml of concentrated sulphuric acid in 50 ml of water, cool and saturate with salt remove the upper layer of butane-1-thiol (B) and combine it with (A). Extract the aqueous liquid with 75 ml of ether, dry the ethereal extract with sodium sulphate or calcium sulphate and distil off the ether from a water bath through a fractionating column. Combine the residue with A) and (B), and distil. Collect the butane-1-thiol at 97-99 °C. The yield is 24 g (72%). 

IUPAC name methanethiol butane-1-thiol but-2-ene-l-thiol 2-mercaptoethanol... 

Initial rates and product distributions in thiophen hds and in reaction of possible intermediates over sulphided M0/AI2O3 and C0-M0/AI2O3 catalysts (521 K, < 1 atm) were also consistent with reaction via tetrahydro-thiophen according to Scheme 4 butane-1-thiol was not an intermediate. Relative initial rates were (i), 1 (ii), 5-10 (v), to butenes 20, and then to butane 0.1. Co promoted the desulphurization rate and, to a lesser extent, the olefin hydrogenation rate. Desulphurization [C-S scission, step (zY)] occurred on a site involving Co and Mo and hydrogenation on a Mo site. 

Components 1. C4H10S, Butane-1-thiol [109-79-5] 2. C7H1S, Heptane [142-82-5]... 

---