Organosulfur precursors

A rational manipulation of the electrode surface functionality by immobilizing selected types of molecules is an essential key for the development of electrochemical sensors and devices. One of the recent studies in this area has focused on monolayer formation on gold surfaces from organosulfur precursors [11]. Stable attachment of organic molecules to gold... 

SCHEME 1 Modification of double-stranded DNA with organosulfur precursor and immobilization on An surface via chemisorption. 

Thiannulation is used here to designate the formation of a heterosulfur ring from an organosulfur precursor. It may result from the intermolecular condensation of two or more precursors, one bearing the requisite sulfur atom in an acyclic structure. Alternatively, it may involve an intramolecular cyclization. By contrast, sulfur bridging involves inorganic sulfur as the source of the heteroatom. 

Thiophene, benzo[d]thiophene and dibenzo[d,organosulfur compounds formed at Rh- and Ir-mediated thiophene ring opening 97SL643. 

Since (-)-(5 -45 is a common precursor to many chiral organosulfur... 

In Scheme 6.17, two examples of the / -, a-double alkylation of cydopentenone are shown. In the first reaction an organosulfur compound is used as the radical precursor [30] and in the second allyltriphenyllead is used instead of allyltributyltin [31]. 

Nitrogen is usually present in minor amounts, but sulfur can be present in high concentrations, >1%, depending on the precursor that is used to manufacture the carbonaceous material. Besides sulfur that is bonded to carbon, other forms such as elemental sulfur, inorganic sulfate, and organosulfur compounds may be present. The carbon-sulfur surface compounds on carbon blacks are relatively stable, but they desorb as H2S when carbon is heat-treated in H2 between 500 and 1000°C. 

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