Discussion and conclusion-Organometallics

Discussion and conclusion-Organometallics - Marta...

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Marta Gebregziabher Discussion: Organometallic reaction: Preparation of Benzoic Acid 1. Organometallics are compounds that are made up of carbons and metals. Some examples of organometallic compounds include Gilman Reagents, which contain copper and lithium. Another example of an organometallic compound is all of the Grignard Reagents; this includes butyllithium, and lithium dimethylcuprate. Grignard Reagents are prepared by using an alkyl- or aryl-halide, mixing it with a Magnesium metal in an ether solvent. Grignard reactions is where the nucleophile which is the Grignard Reagent (which is an aryl- or alkyl-magnesium halide), reacts with the electrophile. This reaction is very important because it generates a new carbon-carbon bond. When making Grignard reagents, which are strong bases, or nucleophiles, the reaction must be in aprotic solvents. Protic solvents can donate H+ where as aprotic solvents cannot donate H+. The best and most inexpensive solvent is diethyl ether, and this solvent is aprotic so it will not donate a H+. When making the Grignard Reagent, there are 3 common side reactions and one of them is more important than the others. One of the side reactions is the R-MgX + O2 r-O2MgX. Another side reaction is R-MgX + CO2
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This note was uploaded on 12/04/2009 for the course CHE 210 taught by Professor Swinnea during the Spring '08 term at University of Texas at Austin.

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Discussion and conclusion-Organometallics - Marta...

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