Patil

You may use reusable binaphthyl stabilized Pt nanoparticles (Pt-BNP) as catalyst in water, the procedure reported by

--- Rajib Saha and Govindasamy Sekar Applied Catalysis B: Environmental 250, 325-336 (2019).

Good luck

Nitin Dnyandeo Patil yes, nickel hydroxide has been reported as a green and easily prepared catalyst for benzylic oxidation. For more information see the attached article.

Dear all, a wide range of methodologies are available, any search engine will generate hundreds of documents. All claiming Green processes, though at least using toxic heavy metals! The following are only samples. My Regards

https://doi.org/10.1039/C3GC42135J

10.2174/2211544706666170117122325

https://doi.org/10.1016/j.arabjc.2020.01.017

https://doi.org/10.1039/C9GC03000J

https://www.researchgate.net/publication/339751230_Hydrogen_Peroxide_as_a_Green_Oxidant_for_the_Selective_Catalytic_Oxidation_of_Benzylic_and_Heterocyclic_Alcohols_in_Different_Media_An_Overview

https://www.researchgate.net/publication/11156753_Green_Catalytic_Oxidations_of_Alcohols

https://doi.org/10.1016/j.arabjc.2013.05.012

https://doi.org/10.1021/acs.joc.9b02997

Catalyst for benzylic oxidation under green condition using N-Hydroxy phthalimide, , Oxygen(3 mole) and COCl2, 6H2O and di-n-decyl dimethyl ammonium bromide and using phase transfer catalyst tetrabutyl ammoniun bromide is possible to give carbonyl compound(aldehyde or ketone)depending up on staring material.

Madhukar Baburao Deshmukh I assume / hope you mean CoCl2, not COCl2 ! 🤣

Thanks everybody for your suggestions. it will help me lot

Hi;

Please see attached documents

With my best regards

Dear Nitin Dnyandeo Patil I fully agree with Abdelkader BOUAZIZ and Doufnoune RACHIDA Rachida in that numerous "green" catalysts for benzylic oxidation have been reported in the literature, but some of them are rather fancy and not easily prepared. I suggested Ni(OH)2 in my first answer because it can be prepared in a very simple manner by precipitation from aqueous solution. It is also perfect in a double sense because it is a green solid.

Dear Nitin Dnyandeo Patil, Doufnoune RACHIDA Rachida and Abdelkader BOUAZIZ to me the question remains which heavy metals are allowed in a "green" catalyst?

Dear Prof. Frank T. Edelmann, I checked literature about Ni(OH)2, yes you are Wright it is a green catalyst, but it instable under some conditions mainly acidic ones. It is for this unstability that the question of toxicity arises again, mainly when in direct contact with. I am not contrarying you Sir, I have a special respect to you and to all German Scientists, but to enlarge the discussion and to make the author of the question a litle bit aware by the potential toxicology of metals. For this I invite you to take a look at the attached files. My Regards

Abdelkader BOUAZIZ I think it's the insolubility of Ni(OH)2 in neutral and basic medium that justifies it's use as "green" catalyst. However, when it is dissolved in acidic medium, the toxicity of Ni2+ comes into play.

Dear Prof. Frank T. Edelmann, the best choice to enhance to a great deal the green feature of nickel catalysts is to use them as supported on inorganic substrat (SiO2, Al2O3, ...), organic supports (polymers, complex cage molecules such as Salen, ...), and others. My Regards