Publication detail

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

Authors: Hanusek Jiří | Verner Jiří | Potáček Milan

Year: 2003

Type of publication: ostatní - přednáška nebo poster

Name of source: 13th European Symposium on Organic Chemistry (sborník str. 260)

Publisher name: Croatian Chemical Society

Place:

Page from-to:

Titles:

Language	Name	Abstract	Keywords
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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