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Title: Preparation of calibrants for speciation studies of organotin and organoarsenic compounds in environmental samples
Author: Uzal Barbeito, Luis Angel
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 1995
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In the first section of this thesis, series of tetraorganotin compounds have been synthesised for their use as calibrants in speciation studies. The preparation of these organotin species involve the combination of alkylation of organotin halides with Grignard reagents and selective cleavage of carbon-tin bonds using iodine as cleavage reagent. Some of the compounds synthesised have been used to carry out a comparative study of derivation of butyltin halides by pentylation using pentylmagnesium bromide, PeMgBr, and by ethylation with sodium tetraethylborate, NaBEt4. The determination of the resulting tetraalkyltin species was made by Gas Chromatography with Flame Photometric Detection, GC-FPD. No significant differences between both procedures were found. The capability of sodium tetraethylborate as ethylating reagent was tested for other organotin compounds such are organotin oxides, carboxylates and mercaptides. It was found that, in some cases, the success of the reaction depends on the volume of the other groups attached to the tin centre. Finally it was study the selectivity of the reaction of sodium tetraethylborate with organotin halides with alkyl chains carrying other functional groups (i.e. carboxylates, phosphines) bonded to the tin atom. In the second section, it is described the synthesis of some arsenoribosides related with the organoarsenic species that so far have been isolated and identified in marine organisms and that are considered of interest for the fully establishment of the biodegradation pathways which lead to the formation of the major organoarsenic species in marine environments, the arsenobetaine.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available