Publikace detail

Kinetics and Mechanism of Criss-cross Cycloaddition of 1,4-Disubstituted 1,4-Diazabuta-1,3-dienes With Potassium Isocyanate and Isothiocyanate

Autoři: Hanusek Jiří | Verner Jiří | Potáček Milan

Rok: 2003

Druh publikace: ostatní - přednáška nebo poster

Název zdroje: 13th European Symposium on Organic Chemistry (sborník str. 260)

Název nakladatele: Croatian Chemical Society

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Strana od-do:

Tituly:

Jazyk	Název	Abstrakt	Klíčová slova
cze	Kinetika a mechanismus criss-cross cykloadice 1,4-disubstituovaných 1,4-diazabuta-1,3-dienů s isokyanátem, isothiokyanátem draselným		Kinetika, mechanismus, criss-cross cykloadice, 1,4-disubstituované 1,4-diazabuta-1,3-dieny
eng	Kinetics and Mechanism of Criss-cross Cycloaddition of 1,4-Disubstituted 1,4-Diazabuta-1,3-dienes With Potassium Isocyanate and Isothiocyanate	We have focused our attention on kinetics and mechanism of reaction mentioned in the title. It was found that the observed rate constant increases linearly with the concentration of KNCX (X = O,S) and the slope is giving bimolecular rate constant k which varies from 6.7 to 36.6 l?mol?s?1 depending on substitution at benzene ring. From slopes of Hammett correlation (positive value for KNCS and negative for KNCO) it is evident that reaction is strongly affected by nucleophilicity of NCX? anion.	Kinetics, mechanism, criss-cross cycloadittion, 1,4-disubstituted 1,4-diazabuta-1,3-dienes

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