Cycloaddition reactions are useful tools for building rings by using electrons to form o bonds between atoms. For the products below, identify a reasonable set of starting materials to make each product. NH₂ O g O Which of the two sets of starting materials you proposed above do you think would react more quickly? Think about what makes a cycloaddition fast or slow and justify your answer.
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- Consider the mechanism for 1,2 and 1,4 addition reactions. If the cation intermediate is the same in energy on the reaction coordinate diagram, how do different products form selectively? Alkene stability dictates the reaction. Reaction conditions control which product is formed. The transition state: once the new bonds start to form, the cations are no longer in resonance and the transition states become different in energy. Activation energy distinguishes the products.You determine the bimolecular rate constant k for a set of SN2 reactions. Based on your understanding of how the nucleophile effects the rate constant for an SN2 reaction, drag and drop the nucleophiles into the correct rows in the table below. Alkyl halide Nucleophile k / L mol-1 s-1 CI 0.011 -CI 0.045 0.074 0.095 -NH2 -NH2 >-NH2 -NH2 -NH2There are two mechanisms by which each of the C1 atoms in the following molecule can be replaced by another group: ⚫ Mechanism 1: The C1 atom can be replaced with a concerted, bimolecular step. Mechanism 2: The C1 atom can be replaced in several steps, the slowest of which is unimolecular. Highlight in red the C1 atom that would be replaced the fastest if the reaction went Mechanism 1. Highlight in blue the C1 atom that would be replaced the fastest if the reaction went Mechanism 2. If you would choose the same C1 to be replaced fastest by both mechanisms, highlight it in green instead. C1 cl. C1
- 1. OH ??? Br + B ОН For the above reaction identify the catalyst and reagents and also show the catalytic cycle.didentify the Allowry reactions, as substitution, elimination, or addition DrawWelection arrows to show how the in each reactors Circle and identify any reactive bands break & form intermediates of carbon. Ħ Br Br → AH-Br →→ → XB²Br OH", H2O A + Br HO B / SH¯, CH3SH HS' + Br Br Which reaction is predicted to be faster (A or B)? Reactions A and B are of the same type. Classify the reactions shown in A and B as SN1 or Sn2 (write 1 if SN1, write 2 if SN2)?
- Write the mechanism for the following reaction: `Br ELOH Write the mechanism and predict if the reaction above be faster or slower than the following reaction? Explain. Br ELOHConsider the reaction and answer the questions that follow. CH-CH2- CH2-I • CH,S° CH3- CH2- CH2-S– CH; + CH3-CH= CH2 Product A Product B O Explain which type or types of mechanisms (Sw1, SN2, E1, and E2) are applicable to this reaction. [") How can you increase the percentage of Product A? [ui) How can you obtain Product B as almost the only product? A. [i] SN2 & E2 [ii] Use better nucleophile [iii Use a non-nucleophilic base B. [i] SN2 & E2 [ii] Use higher Temperature [iii] Use a non- nucleophilic base C. [i] SN2 & E2 [ii] Use lower Temperature [iii] Use a non-nucleophilic base D. [i] SN1 & E1 [ii] Use lower Temperature [iii] Use a non-nucleophilic baseFor a reaction that generates both kinetic and thermodynamic products, which of the following is associated with the thermodynamic product? O It involves the lower energy transition state. O tis formed faster. O Itis favored with cold reaction conditions. O It is the more stable product.
- Q6: Consider the following reaction: (CH3) 3CBR + H20 (CH3) 3COH + HBr 1. a: What will happen to the rate of the reaction if [ (CH3) 3CBr] is doubled b: What will happen to the rate of the reaction if [H0] is doubled c: What will happen to the rate of the reaction if both [ (CH3) 3CB1] and [H20] are doubledFor the following reaction there are three (3) possible products. Two of the products are expected to be minor and one product is expected to be a major product. Br H₂O Name and draw out the step-by-step mechanisms by which each of the products is formed. Briefly explain why one of the three products is expected to be a major product.78:-Sketch an energy diagram for a one-step reaction that is fast and highly exergonic.