Conditions for obtaining of η-dodecylmercaptan (2) by the reduction of di-η-dodecyl disulfide (1) with pressure in the presence of molybdenum trisulfide (MoS
3) catalyst have been investigated.
The cleavage of (1) to (2) began at around 1200C, the yield of (2) reached to above 92% at 120-200°C and dodecane was formed above 250°C. An increase of reaction temperature and initial pressure was effective for acceleration of reaction, gave a slight increase in yield of (2) and decreased the amount of unreacted (1).There was practically no side-reaction product and this method is considered to be an excellent one as the yield of (2) exceeded 95%.
Nearly the same results were obtained by using recovered MoS3, MoS
2 and (NH
4)
2MoS
4 catalysts, while using of MoO
3 was unsatisfactory as it required to heat at high temperature for reaction.
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