Other organosulphur compounds

In Scheuer (1973), investigations concerning sulphur-containing compounds in lipids of brown algae are reviewed which are biogenetically related to the dictyopterenes (Moore et al., 1972). The spectroscopically identified compounds belong to the classes of alkyl thioacetates, open-chain disulphides, and l,2-dithiepin-5-ones as well as organic tri- and tetra-sulphides. 

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In a method described by Bates and Carpenter [8] for the characterization of organosulphur compounds in the lipophilic extracts of marine sediments these workers showed that the main interference is elemental sulphur (S8). Techniques for its elimination are discussed. Saponification of the initial extract is shown to create organosulphur compounds. Activated copper removes S8 from an extract and appears neither to create nor to alter organosulphur compounds. However, mercaptans and most disulphides are removed by the copper column. The extraction efficiency of several other classes of sulphur compounds is 80-90%. Extracts are analyzed with a glass capillary gas chromatograph equipped with a flame photometric detector. Detection limit is lg S and precision 10%. 

Recent work ( ) with model organosulphur compounds has shown that at temperatures above 350 C and pressures in excess of 100 atm (1500 psig), the hydrolytic desulphurisation reaction occurs readily with thioethers, mercaptans and other non-thio-phenic types of organosulphur compounds. Thiophene itself is more resistant to this type of reaction but desulphurisation is significant in the 450 - 500 C range. More complex fused ring sulphur containing aromatic structures, can, however, be more reactive. 

Table 15.10 presents a summary of the applications of gas chromatography to the determinations of other organic compounds, including chlorofluoroparalfins, carboxylic acids, monosaccharides, organosulphur compounds, polychlorobiphenols and azine herbicides in seawater. 

Books published recently include several that are wholly devoted to organosulphur compoundsand others " in which specific chapters are relevant to the coverage in this chapter. Reviews have appeared that deal with applications of organosulphur compounds in synthesis " (including uses of yff-keto-sulphides, vinyl sulphones, and vinyl sulphides ) and the synthesis of organosulphur compounds,sulphenyl compounds, indolethiols, allenic sulphides and sulphenamides, organosilyl sulphides, selenides, and tellurides, optically active... 

Other organic compounds, including organosulphur compounds such as mercap-toethanol or organic amines, have very unpleasant odors. Others are highly reactive and must be handled with appropriate care. 

Recent developments in organosulphur chemistry have been broadly reviewed, and other more general reviews cover applications of electron spectroscopy and dynamic conformational analysis of organosulphur compounds. ... 

Like the preceding section, relatively little beyond a statement of the content of each paper is provided for most of the citations dealing with spectroscopic and other physical studies of organosulphur compounds in the following paragraphs. However, all the references include interpretation of the data in terms of conformation, bonding, or insight into reactivity mere data compilations are excluded. 

Theoretical Aspects of Organosulphur and Organoselenium Compounds is a review for the period April 1970 to March 1974, with emphasis in this volume on conjugated systems. A review of the chemistry of Thiepins, Dithiins, and Thiazepines has been omitted. A review of these subjects, covering the four-year period April 1972 to March 1976, will appear in Volume 4. Reviewing of all other material covered in this Volume is for the two-year period April 1972 to March 1974. 

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