Kinetic study of thermal isomerisation of 25,26,27,28?tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene.

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Kinetic study of thermal isomerisation of 25,26,27,28?tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene.

Popis výsledku v původním jazyce

Thiacalix[4]arenes, analogues of the popular building blocks in supramolecular chemistry - calix[4]arenes, possess new chemical features with respect to the parent compounds, for instance due to possible oxidation of sulphur atoms to sulfone or sulfoxidegroups or due to their high affinity to transition-metal cations.These compounds can, in principle, adopt four basic conformations - cone, partial cone, 1,2?alternate and 1,3-alternate (Fig. 1) - that can in some cases interconvert. The interconversion barriers depend on size of substituents at lower rim. 25,26,27,28-Tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene 1 undergoes conformational transitions only at elevated temperature yielding equilibrium mixture of all four conformers. [4] This process was continuously monitored by 1H NMR spectroscopy. Reaction rate and equilibrium constants were computed using an iterative procedure that involves a numerical solution of the set of kinetic differential equations. The calculation procedure ut

Název v anglickém jazyce

Kinetic study of thermal isomerisation of 25,26,27,28?tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene.

Popis výsledku anglicky

Thiacalix[4]arenes, analogues of the popular building blocks in supramolecular chemistry - calix[4]arenes, possess new chemical features with respect to the parent compounds, for instance due to possible oxidation of sulphur atoms to sulfone or sulfoxidegroups or due to their high affinity to transition-metal cations.These compounds can, in principle, adopt four basic conformations - cone, partial cone, 1,2?alternate and 1,3-alternate (Fig. 1) - that can in some cases interconvert. The interconversion barriers depend on size of substituents at lower rim. 25,26,27,28-Tetrapropoxy-2,8,14,20-tetrathiacalix[4]arene 1 undergoes conformational transitions only at elevated temperature yielding equilibrium mixture of all four conformers. [4] This process was continuously monitored by 1H NMR spectroscopy. Reaction rate and equilibrium constants were computed using an iterative procedure that involves a numerical solution of the set of kinetic differential equations. The calculation procedure ut

Druh

D - Stať ve sborníku

CEP obor

CC - Organická chemie

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2001

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Central European NMR Discussion Groups

ISBN

80-210-2566-2

ISSN

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e-ISSN

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Počet stran výsledku

1

Strana od-do

41

Název nakladatele

Masarykova univerzita Brno

Místo vydání

Brno

Místo konání akce

Valtice, ČR

Datum konání akce

23. 4. 2001

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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