Sulfur, diatomic sources

Insertion of a two-sulfur unit into the S-S bond of the tailor-made polysulfides was studied by Harpp and Rys <2000TL7169>. Triphenylthiosulfenyl chloride 134 was used as a source of diatomic sulfur to produce the tetra-thiocines 135 from the disulfides 118 in high yield (Equation 41). 

Several diatomic ligands similar to CO are worth brief mention. Two of these, CS (thio-carbonyl) and CSe (selenocarbonyl), are of interest in part for purposes of comparison with CO. In most cases, synthesis of CS and CSe complexes is somewhat more difficult than for analogous CO complexes, because CS and CSe do not exist as stable, free molecules and do not, therefore, provide a ready ligand source.Therefore, the comparatively small number of such complexes should not be viewed as an indication of their stability. Thiocarbonyl complexes are also of interest as possible intermediates in certain sulfur transfer reactions in the removal of sulfur from natural fuels. In recent years, the chemistry of complexes containing these ligands has developed more rapidly as avenues for their synthesis have been devised. 

The high-intensity continuum source offers a number of advantages over narrow line sources. Secondary lines (nomesonance lines) can be used in order to reduce sensitivity, thereby avoiding dilntions. All spectral lines are available, including lines for which no HCL or EDL sources are available, such as fluorine and chlorine. In addition, molecular absorptions, such as those of diatomic fragments like CS or PO, can be used to measure sulfur and phosphorus (Huang et al.)... 

First Storable Source of Diatomic Sulfur S2. Access to diatomic sulfur (a very reactive sulfur species) was limited to methods involving deconposition of reactive intermediates like triph-enylphosphane ozonide or bis(thiobenzoyl)biphenyl (generated in situ from BCI3 and 2,2 -dibenzoylbiphenyl). Their spontaneous decomposition produced the 2-sulfur-transfer reagent. The inconveniencies of this approach lead to a series of ingenious... 

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