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Catalysts
Volume 11
Issue 6
10.3390/catal11060656
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Article
Peer-Review Record

Immobilization of an Iridium(I)-NHC-Phosphine Catalyst for Hydrogenation Reactions under Batch and Flow Conditions

Catalysts 2021, 11(6), 656; https://doi.org/10.3390/catal11060656
by Henrietta Kovács 1,2, Krisztina Orosz 1,2, Gábor Papp 1, Ferenc Joó 1,3 and Henrietta Horváth 3,*
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Catalysts 2021, 11(6), 656; https://doi.org/10.3390/catal11060656
Submission received: 30 April 2021 / Revised: 13 May 2021 / Accepted: 21 May 2021 / Published: 22 May 2021
(This article belongs to the Special Issue Catalysis in Heterocyclic and Organometallic Synthesis)

Round 1

Reviewer 1 Report

The present paper entitled

"Immobilization of an Iridium(I)-NHC-phosphine catalyst for hydrogenation reactions under batch and flow conditions"

by Henrietta Horvath deals with the immobilisation of the Ir-based anionic catalyst Na2[Ir(cod)(emim)(mtppts)] (1)  on ammonium-based anion exchangers. Lewatit MonoPlus MP 500 ion-exchange resin gave excellent results (including leaching) and 1@Lewatit was submitted to catalytic test reactions. The unsaturated substrates for hydrogenation test reactions were chosen reasonably and with relevance. The work has been carried out with a high scientific standard. I am happy to recommend this study for publication and only have minor comments:

i) Some formatting should be done: tables should be centred, caption and figure on the same page....

ii) Figure 1. The spectra should be labelled with time they were taken at, e.g. 5 min, 10 min...

iii) The selectivity of C=C vs. C=O hydrogenation in benzylideneacetone for 1@Lewatit is high. Does the non-immobilised catalyst 1 in homogenous solution display the same selectivity?

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Reviewer 2 Report

Horváth et. al in their article presented immobilization of an Iridium(I)-NHC-phosphine catalyst for hydrogenation reactions under batch and flow conditions. This is a continuation of previous studies concerning catalyst immobilization and its utilization in hydrogenation or related transformation. In my opinon the presented work is suitable for the publication in the Catalysts after major revision. However, some  issues shloud be calrified.

1) Author's used the heterogenous catalysts in batch and flow operations. Did any attempts for the recycling of the catalysts under batch mode were applied?

2) Why did the Authors use spectrophotometric study for the leaching test?  The control of the Ir  in the final products by ICP-MS or ICP-OES analyzes will better show the leaching during the reaction. If it is possible please add this analysis.

 

Author Response

Please see the attachment.

Author Response File: Author Response.pdf

Round 2

Reviewer 2 Report

Accept in present form

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