Dear Banchhanidhi Prusti

In addition to the answers afforded by Frank T. Edelmann and Abdelkader BOUAZIZ , I suggest another synthetic way. This includes the formylation of anisole using Vilsmeier–Haack reaction and the product is then oxidized to form the target product.

All the best

Dear Banchhanidhi Prusti, please find attached an article describing the ortho-metalation (lithiation) of various methoxybenzene derivatives. Once you made the lithiated intermediates in situ, you do not need to isolate them. They can be directly converted to the ortho-carboxylates by reaction with CO2 (e.g. slow addition of dry ice), followed by aqueous work up (pouring the reaction mixture on ice, acidifying with HCl and extraction with diethyl ether) to give the desired ortho-carboxylic acids.

Dear Banchhanidhi Prusti, I hope the reference is useful. If you have any further questions regarding this topic, please let me know!

Dear Banchhanidhi Prusti, besides the contribution of Prof. Frank T. Edelmann, I attached two documents mainly the first one going in the same direction. Also I advise you to search with the keyword 'anisole' instead of methoxybenzene, you will endup with fruitfull documents. My Regards

Dear Abdelkader BOUAZIZ, that's a good hint! I also did my literature search by using the keyword "anisole" instead of "methoxybenzene derivatives". 👍

Dear Banchhanidhi Prusti

In addition to the answers afforded by Frank T. Edelmann and Abdelkader BOUAZIZ , I suggest another synthetic way. This includes the formylation of anisole using Vilsmeier–Haack reaction and the product is then oxidized to form the target product.

All the best

Dear all, the attached thesis is a good compilation of CO formylation of aromatics including anisole. My Regards

Thank you all. It really helped me.