KINETIC PRESSURE AND SUBSTITUENT EFFECTS ON THE THERMAL ISOMERIZATION OF TRIPHENYLFORMAZANS.

Yoshimi Sueishi, Norio Nishimura

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

The rates of the thermal isomerizations around N equals N (Process A) and C equals N (Process B) of substituted triphenylformazans were followed spectrophotometrically at various temperatures and under high pressures, and the activation parameters were determined. The values of the activation energy, entropy, and volume were found to be ca. 70 kJ mol** minus **1, ca. minus 20 J K** minus **1 mol** minus **1, and ca. minus 5. 0 cm**3 mol** minus **1 respectively for Process A, and ca. 40 kJ mol** minus **1, ca. minus 200 J K** minus **1 mol** minus **1, and ca. minus 10 cm**3 mol** minus **1 respectively for Process B. It is suggested that the thermal isomerizations both for Processes A and B proceed by the inversion mechanism.

Original languageEnglish
Pages (from-to)2598-2604
Number of pages7
JournalBulletin of the Chemical Society of Japan
Volume56
Issue number9
DOIs
Publication statusPublished - Jan 1 1983
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)

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