(Solved): 2. After work-up, the product of the Wittig reaction was recrystallized from hot isopropanol. You w ...

2. After work-up, the product of the Wittig reaction was recrystallized from hot isopropanol. You were told to do a gravity filtration using a heated stemless funnel if the solution appeared cloudy. What was the likely identity of compound that caused the cloudiness? It was also indicated that the filter should be washed with hot isopropanol if crystals started to form on the stemless funnel. Why would hot isopropanol be used instead of cold isopropanol?