Reactivity of a Substituted m-Benzyne Biradical

Autor:	Hilkka I. Kenttämaa, Kami K. Thoen
Rok vydání:	1999
Předmět:	Chemistry Photodissociation Ionic bonding General Chemistry Photochemistry Biochemistry Aryne Catalysis Fourier transform ion cyclotron resonance chemistry.chemical_compound Colloid and Surface Chemistry Reaction rate constant Reactivity (chemistry) Pyridinium Constant (mathematics)
Zdroj:	Journal of the American Chemical Society. 121:800-805
ISSN:	1520-5126 0002-7863
Popis:	Fourier transform ion cyclotron resonance mass spectrometry has been employed to systematically investigate the intrinsic (solvent-free) reactivity of a 1,3-dehydrobenzene (m-benzyne) with a pyridinium charge site in the 5-position. The m-benzyne was generated by using a combination of ion−molecule reactions and photodissociation and isolated prior to examination of its gas-phase reactions. The ionic reaction products and reaction efficiencies (second-order reaction rate constant/collision rate constant) were compared to those measured for the isomeric o-benzyne and the analogous phenyl monoradical. The m-benzyne yields some of the products formed for the o-benzyne but it also reacts via distinct radical pathways characteristic of the corresponding phenyl radical. These radical pathways are not observed for the o-benzyne. However, the reaction efficiencies measured for the m-benzyne are significantly lower than those measured for the analogous phenyl radical or the isomeric o-benzyne. These findings are p...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::0869466d8bbd20018e76e6ea3066de81 https://doi.org/10.1021/ja982627b Zobrazit plný text záznamu