Abstract
Laboratory heating experiments have been carried out using a mixture of isomeric C 27 monoaromatic steroid hydrocarbons and 6(R), 10(S) pristane as organic substrate, each on a different sediment matrix. Under free radical conditions in the presence of elemental sulphur triaromatic steroid hydrocarbons and the 6(R), 10(R) and 6(S), 10(S) isomers of pristane were formed, respectively. Both the aromatisation and isomerisation reactions follow pseudo-first-order kinetics and rate constants have been measured. A qualitative investigation of the isomerisation of 5α(H)-cholestane shows that a complex mixture of C 27 isomeric steranes is formed.
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