This preview shows page 1. Sign up to view the full content.
Unformatted text preview: powder, a series of aqueous washes, and a final recrystallization from methanol. Here, a yield of 28% was recovered from an initial mass of 100 mg of recrystallized material. The melting point of the off-white crystalline final product was 146-148 o C, which is very close to the literature value for cholesterol of 148.5 o C. From both the melting points and the physical appearances, it is apparent that the final bromination/debromination procedure did in fact further purify the product. The percent of cholesterol in egg yolks was calculated using the mass of the recrystallized product. This calculation does not seem to be valid, as the melting points demonstrated that the recrystallized product was not as pure as the final product. The goal of the experiment was accomplished; cholesterol was isolated and purified from the egg yolks. Signature/Date...
View Full Document
- Fall '11
- Organic chemistry