THE KINETICS OF SPECIFIC ORGANIC-REACTIONS IN THE ZONE OF CATAGENESIS
THE KINETICS OF SPECIFIC ORGANIC-REACTIONS IN THE ZONE OF CATAGENESIS
复制标题
DOI：
10.1098/rsta.1985.0032
复制
发表时间：
1985-01-01
期刊：
影响因子：
5
通讯作者：
MAXWELL, JR
中科院分区：
文献类型：
--
作者：
ABBOTT, GD;LEWIS, CA;MAXWELL, JR
Recently it has been shown that the measured extent of reactions in sedimentary biological marker compounds during catagenesis (for example, steroid aromatization, sterane isomerization) can assist in providing information about the extent of maturation of sedimentary organic matter before and during oil generation and also the thermal history of sediments. In the present study, aromatization of a C27C-ring aromatic steroid and isomerization at the chiral centres of an isoprenoid alkane, 6(R),10(S)-pristane, have been brought about under laboratory conditions, elemental sulphur being used as the source of radicals. Precise rate laws have been determined and rate coefficients measured at different temperatures. The pre-exponential factors and activation energies were found to be 6.7 x 1012s-1and 145 kJ mol-1for the aromatization, and 2.1 x 107s-1and 120 kJ mol-1for the configurational isomerization of pristane. These values reflect the relative behaviour of the two types of reactions in sediments, the aromatization being the more temperature-dependent reaction.
