Reaction of polysulfide anions with α, β, unsaturated isoprenoid aldehydes in aquatic media:: simulation of oceanic conditions

被引：41

作者：

Amrani, A ^{[1
]}

Aizenshtat, Z ^{[1
]}

机构：

[1] Hebrew Univ Jerusalem, Casali Inst Appl Chem, Dept Organ Chem, IL-91904 Jerusalem, Israel

来源：

ORGANIC GEOCHEMISTRY | 2004年 / 35卷 / 08期

关键词：

D O I：

10.1016/j.orggeochem.2004.04.002

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Polysulfide anions react with alpha, beta unsaturated aldehydes in aquatic media. Michael addition mechanisms control the first step, which follows the same pathway as in phase transfer catalysis (PTC) systems. The end products are polysulfide cross-linked oligo-polymers. The kinetic profiles, measured by H-1 NMR and elemental analysis, changed dramatically with the length of the carbon skeleton. The reaction rates are controlled by the concentration of both polysulfides and the substrate. A comparative study revealed the importance of the cation (e.g., sodium or ammonium) and pH conditions, as controlling factors. The mechanism proposed is further elucidated by the detailed study of MeLi/MeI degradation products release from the oligo-polymers formed. These results are important in increasing our understanding the role of polysulfides in sulfur enrichment of organic matter in marine environments. (C) 2004 Elsevier Ltd. All rights reserved.

引用

页码：909 / 921

页数：13

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