Benzophenone Lab Report

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Grignard reagent can be used to make alcohols. Grignard reagents are nucleophiles that add to a carbonyl of a ketone or aldehyde. A nucleophile donates a pair of electrons to an electrophile , to form a chemical bond (James). The nucleophile that will be used is phenylmagnesium bromide. They react with aldehydes to form secondary alcohols or react with ketones to form tertiary alcohols. Since benzophenone is a ketone, a tertiary alcohol will be formed. Benzophenone is the electrophile. A Grignard reagents is important to organic synthesis and can be easily prepared using an organic halide, turnings, and an ether solvent Weldergirma). Grignard reagents are also strong bases and will react with any acid hydrogen so a synthesis that involves…show more content…
Molar Mass=157.01 g/mol. Density=1.475 g/cm3. Melting Point= -30.8°C. Boiling Point= 156°C. Very hazardous in case of eye contact, ingestion, or inhalation.  Anhydrous diethyl ether-Ethoxyethane. C4H10O. Molar mass=74.12 g/mol. Density=0.7134 g/cm3. Melting point=-116°C. Boiling Point=34.6°C. This product is extremely flammable in presence of open flames. Do not induce vomit, if ingested.  HCl- 36.46 g/mol . Boiling point=103°C. Melting point= 18°C. This chemical is very hazardous in case of skin, eyes or ingestion. HCl is a lung sensitizer and may produce tissue damage in the mucous membranes.…show more content…
The melting point that was recorded was 140°C. The melting point was about twenty-two degrees off. Hot isopropanol was not used to dissolve the crude product which may explain why the melting point was so low. The crystal may not have been in its purest form due to the faults of not washing it correctly. Only .28 grams of Triphenylmethanol was collected, which placed the percent yield at 18.7%. An error could have error by allowing some water into this dry experiment. Also, more crystals could have been collected but some of the compound was stuck on the side of the beaker. An aprotic solvent had to be used because a strong base would react with a protic solvent readily and cause the product that is wanted would not be

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