formic acid

<b>Multi-step reaction with 3 steps<br /> </b>1: 71 percent<br />2: 85 percent / NaBH₃CN / acetic acid<br />3: 57 percent / Na₂WO₄*2H₂O, 30percent H₂O₂ / methanol; H₂O<br /> <br /> &nbsp;