Multi-step reaction with 7 steps 1: 3.5 g / hydrazine hydrate / ethane-1,2-diol / 140 deg C, 1 h then 195 deg C, 6 h2: pyridine3: 3.62 g / lead tetraacetate, iodine / CCl4 4: 1.5 g / Zn/HCl / dioxane5: perchloric acid6: 1.2 g / CrO3/pyridine / CH2Cl2 / 0.25 h / 20 °C7: 1.) Mg,I2 / 1 h, reflux  

Multi-step reaction with 8 steps 1: 3.5 g / hydrazine hydrate / ethane-1,2-diol / 140 deg C, 1 h then 195 deg C, 6 h2: pyridine3: 3.62 g / lead tetraacetate, iodine / CCl4 4: 1.5 g / Zn/HCl / dioxane5: perchloric acid6: 1.2 g / CrO3/pyridine / CH2Cl2 / 0.25 h / 20 °C7: 1.) Mg,I2 / 1 h, reflux8: 0.675 g / pyridine / 0 °C  

Multi-step reaction with 9 steps 1: 3.5 g / hydrazine hydrate / ethane-1,2-diol / 140 deg C, 1 h then 195 deg C, 6 h2: pyridine3: 3.62 g / lead tetraacetate, iodine / CCl4 4: 1.5 g / Zn/HCl / dioxane5: perchloric acid6: 1.2 g / CrO3/pyridine / CH2Cl2 / 0.25 h / 20 °C7: 1.) Mg,I2 / 1 h, reflux8: 0.675 g / pyridine / 0 °C9: 1.) sodium iodide, zinc; 2.) dilute acid / 1.) reflux, glyme