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- Qiu, Yanling (author)
An improved method for assessing relative nucleophilic substitution reactivities of polychlorinated benzenes
- Article/chapterEnglish2009
Publisher, publication year, extent ...
- Elsevier BV,2009
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:su-26801
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-26801URI
- https://doi.org/10.1016/j.chemosphere.2008.11.045DOI
Supplementary language notes
- Language:English
- Summary in:English
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Notes
- An existing substitution reaction method was improved as part of a system to measure the persistency of selected chemicals in the environment by evaluating their chemical reactivity. Hexachlorobenzene (HCB), pentachlorobenzene, 1,2,4,5-tetrachlorobenzene and 1,2,4-trichlorobenzene were selected as model compounds. Sodium methoxide in methanol was used as a nucleophile and found to be stable for at least 35 days after preparation. The substitution reaction system was modified so that nitrogen protection was not necessary to avoid oxidation and hydrolysis effects, which led to improved results. The reactivity of polychlorinated benzenes (PCBz), which substituted chlorine for methoxide according to a second-order rate constant, increased as the number of chlorine atoms on the benzene ring increased. HCB was selected as a standard for the k2 calculations of the substitution reactions. A normalized k2 (kN) was calculated as kN = kPCBz/kHCB. GC–MS analysis confirmed that the reactions were pure nucleophilic aromatic substitutions without side reactions.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Miljövetenskap hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Environmental Sciences hsv//eng
- Nucleophilic substitution
- Polychlorinated benzenes
- Nucleophile
- Reactivity
- Persistency
- Chemical stability
- Environmental chemistry
- Miljökemi
Added entries (persons, corporate bodies, meetings, titles ...)
- Eriksson, JohanStockholms universitet,Institutionen för miljökemi,Percistency(Swepub:su)johaner (author)
- Granelli, LisaStockholms universitet,Institutionen för miljökemi,Percistency(Swepub:su)lgran (author)
- Bergman, ÅkeStockholms universitet,Institutionen för miljökemi(Swepub:su)alb (author)
- Stockholms universitetInstitutionen för miljökemi (creator_code:org_t)
Related titles
- In:Chemosphere: Elsevier BV75:1, s. 78-820045-65351879-1298
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