Review Reports

Round 1

Reviewer 1 Report

The authors have compiled this review very diligently and I feel it is a good addition to the scientific community.

Author Response

Thanks to your useful suggestion. We have checked the manuscript again and improved the language.

Reviewer 2 Report

The Review titled” Recent Progress in Application of Molybdenum-based Catalysts for Epoxidation of Alkenes” is an interesting work summarizing in a complete and detailed form recent progresses in the specific topic.

 

The following minor changes are needed to make more readable and understandable data reported in the Review:

1)      To make more understandable the catalysts activities one more Table (or more Tables), in addition to Table 1, should be added to summarize the reaction conditions as well as, conversions and selectivity obtained  from the scientific papers cited as  References 81, 82, 83, 86, 88, 89, 91. Although often the results are shown in the form of graphics (Figure b and c), or other graphical tools (Figure 6 b and 6 d) for the reader is difficult to compare clearly the efficiency of the different catalysts. Some more Tables are needed.

 

2)      Table 1 needs to be formatted in order to avoid : “acetonitr- ile”, etc.

Line 123: “porous silica and transition metal oxides, etc.” changed into “porous silica, transition metal oxides, etc.”

Line 189: “Molecule sieve materials” changed into “Molecular sieve materials”

Author Response

1. Thanks to your useful suggestion. We have added another three tables in the manuscript to clearly show the reactivity of different catalysts.

Table 1. Results of epoxidation reactions by using homogeneous molybdenum-based catalysts.

Table 2. Results of epoxidation reactions by using polyoxometalates (POMs) catalysts.

Table 4. Results of epoxidation reactions by using different types of heterogeneous molybdenum-based catalysts.

2. Thanks to your useful suggestion. We have changed "porous silica and transition metal oxides, etc." into "porous silica, transition metal oxides, etc." (line 123).

3. Thanks to your useful suggestion. We have changed "Molecule sieve materials" into "Molecular sieve materials" (line 189).

Reviewer 3 Report

This review is well organized and authors systematically reviewed on the "Mo-based catalysts for alkene epoxidation". I think this manuscript can be published as it is.

Author Response

Thanks for your useful suggestions. We have checked the manuscript again and polished the language.

Reviewer 4 Report

The authors reported the recent progress in application of molybdenum-based catalysts for epoxidation of alkenes. Chemistry is interesting and the recent progress is written well. After the correction of a few concerns described below, I wish to recommend this manuscript for "Catalysts".

1) p. 7, line 211, I cannot understand the sentence "residual Si-OH groups by Si-CH3".  Is Si-CH3 correct?   Does it mean Si-OTMS?

2) p.9, Table 1, entries 15 and 16, I cannot understand the word "AcN". Is this CH3CN or CH3CONH2?

3) p.18, line 502, IUPAC name of the OH group is not hydroxyl but hydroxy. Hydroxyl should be used for radicals.

Author Response

1. Thanks to your useful suggestions. "Si-OTMS" is more precise to depict the change. We have changed "Si-CH₃" to "Si-OTMS" according to your valuable suggestion. Me₃SiCl was used to improve the hydrophobicity of the silica surface and the surface Si-OH was replaced by Si-O-Si(CH₃)₃ (p. 7, line 211).

2. Thanks to your useful suggestions. After careful certification, we think AcN should be acetonitrile (CH₃CN) and we have labeled in the manuscript (p. 9, Table 1, entries 15 and 16).

3. Thanks to your useful suggestions. We have changed "hydroxyl" to "hydroxy" (p. 18, line 502).