NDLI: Prins cyclization of isoprenol with various aldehydes using MoO$_{3}$/SiO$

Content Provider	Springer Nature Link
Author	Sekerová, Lada Vyskočilová, Eliška Červený, Libor
Copyright Year	2017
Abstract	MoO$_{3}$/SiO$_{2}$ was used as a catalyst of the Prins cyclization of isoprenol with various aldehydes, with isovaleraldehyde chosen as a model substance. Two catalyst preparation methods, impregnation and sol–gel, were applied and the differences between their structure and catalytic activity were studied. The prepared catalysts were characterized by available methods (XRD, XRF, N$_{2}$ adsorption, SEM and TGA). The catalyst prepared by sol–gel has a better dispersion of molybdenum oxide on the support and contains a lower amount of MoO$_{3}$ crystallites compared to the impregnation method. A higher yield of the desired product (substituted tetrahydropyranol) was achieved using the catalyst prepared by sol–gel (51%) in comparison with the impregnation method (45%). Changing the molybdenum oxide amount in the catalyst had no effect on the activity or selectivity but an increase of the total catalyst amount in the reaction mixture increased the reaction rate. The addition of water had a positive effect on the selectivity of the desired product (a yield up to 60%) but decreased the reaction rate. The prepared catalyst can be reused at least four times in this reaction without any loss of activity or selectivity and it can also be used in the Prins cyclization of isoprenol with various aldehydes. The advantages of MoO$_{3}$/SiO$_{2}$ are its heterogeneous state in the reaction, simple preparation, availability and low cost of raw materials, reusability and activity. The activity is comparable with other heterogeneous catalysts used previously in this reaction.
Starting Page	83
Ending Page	95
Page Count	13
File Format	PDF
ISSN	18785190
Journal	Reaction Kinetics and Catalysis Letters
Volume Number	121
Issue Number	1
e-ISSN	18785204
Language	English
Publisher	Springer Netherlands
Publisher Date	2017-01-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Prins cyclization Molybdenum oxide Silica Isoprenol Aldehydes Catalysis Physical Chemistry Industrial Chemistry/Chemical Engineering
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Catalysis

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