Why does the first product go through elimination? How do you know what\'s a wea

Question

Why does the first product go through elimination? How do you know what's a weak base/ strong base? When do you have the combination of sn1 and e1 or just elimination? 22. (20 pts, 4 pts each) Provide ALL of the organic productis) for each of the reactions below. If more than one organic product is formed, provide them all. Also indicate the stereochemistry of the products and the major product where appropriate. For free radical halogenation reactions, provide only the monohalogenated products. Br NaOMe, MeOH heat E/2 meyor Cl EtOH NaN3 DMSO Cl 29

Explanation / Answer

Answer – We are given the reaction of elimination and substitution.

We know the elimination reaction has needed base, so it can abstract the proton and from the double bond with leaving the group. For the elimination of E1 we need weak base and heat.

For the identified elimination or substitution reaction we need to look for the substrate, given is either nucleophile or base, solvent and temp.

For SN1 or E1 both needed tertiary alkyl halide and for the SN2 or E2 we need secondary or primary alkyl halide.

When we are given the polar aprotic solvent and heating then there is elimination reaction rather than substitution. In the first reaction there is given polar aprotic solvent and heating, so it undergoes with E1 reaction. When the compound is given with less electronegative then it act as strong base and if there is given high electronegativity element in the reagent then it is act as weak base. So more electronegative group like -OCH3, -CN, -X (halogen) acts as nucleophile than base. So there is substitution reaction. If thre is strong base then reaction goes with elimination reaction.

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