Hydrotalcite-like compounds for aldol condensation of cyclopentanone and valeraldehyde

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F19%3A43918219" target="_blank" >RIV/60461373:22310/19:43918219 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Hydrotalcite-like compounds for aldol condensation of cyclopentanone and valeraldehyde

Popis výsledku v původním jazyce

Aldol condensation is an important and useful reaction in C-C bond formation. It is commonly catalysed by NaOH, KOH etc. solutions. Using homogeneous catalysts in this process brings some negative aspects1. Developing a new active heterogeneous base catalyst, such as hydrotalcite-like materials (HT)2, can simplify it in comparison with traditional homogeneous catalysts. 2 Pentylidenecyclopentanone (Fig.1, III) can be obtained by aldol condensation of cyclopentanone (I) and valeraldehyde (II). This compound can be subsequently hydrogenated to a fragrance 2 pentylcyclopentan-1-one (IV), commercially also known as Delphone (Firmenich). This work focuses on the possible utilization of unmodified Mg/Al hydrotalcite-like compounds and also HT modified by palladium, which could serve as a hydrogenation component, in this fragrance synthesis. The activity of prepared catalysts by coprecipitation method with different Mg:Al molar ratios and HT modified by Pd by impregnation method has been studied in aldol condensation of cyclopentanone and valeraldehyde. Reaction conditions were optimized in order to improve selectivity to 2 pentylidenecyclopentanone (reactants ratio, the method of the catalyst activation (calcination or rehydration), the reaction temperature and the catalyst amount).

Název v anglickém jazyce

Hydrotalcite-like compounds for aldol condensation of cyclopentanone and valeraldehyde

Popis výsledku anglicky

Aldol condensation is an important and useful reaction in C-C bond formation. It is commonly catalysed by NaOH, KOH etc. solutions. Using homogeneous catalysts in this process brings some negative aspects1. Developing a new active heterogeneous base catalyst, such as hydrotalcite-like materials (HT)2, can simplify it in comparison with traditional homogeneous catalysts. 2 Pentylidenecyclopentanone (Fig.1, III) can be obtained by aldol condensation of cyclopentanone (I) and valeraldehyde (II). This compound can be subsequently hydrogenated to a fragrance 2 pentylcyclopentan-1-one (IV), commercially also known as Delphone (Firmenich). This work focuses on the possible utilization of unmodified Mg/Al hydrotalcite-like compounds and also HT modified by palladium, which could serve as a hydrogenation component, in this fragrance synthesis. The activity of prepared catalysts by coprecipitation method with different Mg:Al molar ratios and HT modified by Pd by impregnation method has been studied in aldol condensation of cyclopentanone and valeraldehyde. Reaction conditions were optimized in order to improve selectivity to 2 pentylidenecyclopentanone (reactants ratio, the method of the catalyst activation (calcination or rehydration), the reaction temperature and the catalyst amount).

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10401 - Organic chemistry

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 7th International Conference on Chemical Technology

ISBN

978-80-88307-00-6

ISSN

—

e-ISSN

—

Počet stran výsledku

5

Strana od-do

254-258

Název nakladatele

Czech Society of Industrial Chemistry

Místo vydání

Prague

Místo konání akce

Mikulov

Datum konání akce

15. 4. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000515696600046