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(http://www.lp.org/drugwar/)https://www.thevespiary.org/rhodium/Rhodium/archive/cooh-2-ch3.pdf (https://www.thevespiary.org/rhodium/Rhodium/archive/cooh-2-ch3.pdf)
they say that their method is the first known direct reduction of an aliphatic carboxyl function to a methyl group.