Dear Shri. Mohan Wadekar

For this you have to go for partial/low pressure hydrogenation by using suitable hydrogenation catalyst e.g. nickel catalyst. With this only double bond get converted in to single bond i.e. we will convert unsaturated fatty acids to saturated fatty acid.keeping -COOH group unaffected.

Shripad Joshi

Thanks a lot for the answer, Sir! I have been looking for doing hydrogenation using hydrogen transfer agents such as, formic acid, formate salts.... Hydrogen gas is not allowed in this case. 

Regards

Mohan

Thanks for your reply. Sir you may please try sodium borohydrid to do catalytic transfer hydrogenation of molecule.

Best Wishes

Shripad Joshi