3: CrO3, Py View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 74 percent / triphenylphosphine dibromide / CH₂Cl₂ / 0.5 h / Ambient temperature<br />2: 91 percent / NaI / acetone / 10 h / Ambient temperature<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: conc. H₂SO₄ <br />2: pyridine<br />3: NaI / acetone<br /> <br /> &nbsp;

<b>Multi-step reaction with 4 steps<br /> </b>1: 95 percent / pyridinium p-toluenesulfonate / CH₂Cl₂ / 12 h / Ambient temperature<br />2: 1) MeLi / 1) THF<br />3: 74 percent / triphenylphosphine dibromide / CH₂Cl₂ / 0.5 h / Ambient temperature<br />4: 91 percent / NaI / acetone / 10 h / Ambient temperature<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: 1) MeLi / 1) THF<br />2: 74 percent / triphenylphosphine dibromide / CH₂Cl₂ / 0.5 h / Ambient temperature<br />3: 91 percent / NaI / acetone / 10 h / Ambient temperature<br /> <br /> &nbsp;

<b>Multi-step reaction with 5 steps<br /> </b>1: NaNH₂, NH₃ <br />2: 1) n-BuLi<br />3: conc. H₂SO₄ <br />4: pyridine<br />5: NaI / acetone<br /> <br /> &nbsp;