Examination of Alkyl-Halide Formation as a Result of Substitution Reactions of Alcohol-Containing Organic Compounds

This experiment was done to determine the structure of the alkyl halide formed by the substitution reaction and whether the reaction uses the SN1 or SN2 mechanism. The structure of the starting alcohol determines the mechanism of the substitution reaction. Reaction 1 involves the substitution of a primary alcohol to produce a primary alkyl halide by an SN 2 reaction. Reactions 2 and 3 start with a secondary alcohol and form two products by SN1 reaction as a result of direct substitution and / or hydride transfer.

Alkali or wet silver oxide produces alcohol. Since alkyl halides are readily available from alcohols, they are typically prepared from alcohols. It is a nucleophilic substitution reaction in which the hydroxide ion displaces the halide ion. Among the alkyl halides, alkyl iodides are nucleophilically substituted at the fastest rate. The mode of mechanism SN1 and SN2 depends on the nature of the alkyl group. The tertiary alkyl halide is preferably carried out by the SN 1 mechanism, whereas the primary alkyl halide follows the SN 2 mechanism. The secondary alkyl halide can follow any mechanism depending on the reagent used.

Generation of Intermediate Compounds by Nucleophilic Rearrangement of Chloride Ions of Alkoxides With the aid of primary and secondary alcohols, the halides are reacted in the SN 2 process to form halogens with inverse stereochemistry and triphenylphosphine oxide To form alkylated products. The triphenylphosphine oxide formed as a by-product in this reaction is produced by a strong P = O double bond, which is the driving force of the reaction.

II. Reactions involving C - OH bond cleavage: When OH is lost as a nucleophile and another nucleophile is substituted, the C - O bond is cleaved. (I) React with hydrogen halide. Alcohol reacts readily with hydrogen halide to give alkyl halide and water. The reaction is carried out by passing dry hydrogen halide gas through alcohol or by heating alcohol with concentrated aqueous hydrochloric acid solution. HBr can be obtained by concentration reaction in the presence of alcohol. H 2 SO 4 and KBr, and HI can be obtained by reaction between H 3 PO 4 and KI in the presence of alcohol. This reaction is an example of a nucleophilic substitution reaction in which a halide ion is substituted with a hydroxide ion. Hydrogen halide HCl is least reactive and requires the presence of zinc chloride to react with primary and secondary alcohols. The more reactive tert-butanol is converted to the corresponding chloride by simply shaking with HCl at room temperature.