The following transformation takes place during synthesis of thiophene, the transformation is considered as H₂C-C H₂C CH₂ CO₂ RO C CO₂R + R Select one: O a. cyclization @ b. condensation Oc isomerization Od elimination Clear my choice H₂C-C RO₂C
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- M 6 write the principal product in a, c & e and the neccesary reactives for b, d & f in the following reactions :For each reaction, decide whether substitution or elimination (or both) is possible, andpredict the products you expect. Label the major products. chlorocyclohexane + NaOC(CH3)3 in (CH3)3COHElimination occurs when (Z)-3-bromohex-3-ene is treated with NaNH2. Under the same conditions, 1-bromocyclohexeneundergoes elimination much more sluggishly. Explain why
- Q7 Consider the reaction, where the alkane shown is subjected to radical bromination at 25 °C. Br₂ light Describe the major monobromination product. productLDA/THF, 78°Clongrightarrow Predict the major product of the following a- halogenation/a - alkylation reactions under the given reaction conditions.Draw the major organic product(s) for each reaction below. Indicate the stereochemistry
- When 3-methyl-1-butene is reacted with 9-borabicyclo[3.3.1]nonane, the "1-ol" product is formed. What is the detailed reactin scheme for the transformation? Describe the purification procedure.Following is a balanced equation for bromination of toluene.(a) Using the values for bond dissociation enthalpies given in Appendix 3,calculate ∆H0for this reaction.(b) Propose a pair of chain propagation steps and show that they add up to theobserved reaction.(c) Calculate ∆H0for each chain propagation step.(d) Which propagation step is rate-determininThere are two isomeric cyclohexa-1,4-diene products when toluene undergoes the Birch reduction (see Problem 25.24). (a) Draw the mechanism that leads to the formation of the major product. (b) Will the Birchreduction of toluene occur faster or slower than the Birch reduction of benzene itself? Hint: Is –CH3 an electron-donating or an electron-withdrawing group?
- There are two isomeric cyclohexa-1,4-diene products when benzoic acid undergoes the Birch reduction (see Problem 25.24). (a) Draw the mechanism that leads tothe formation of the major product. (b) Will the Birchreduction of benzoic acid occur faster or slower than theBirch reduction of benzene itself? Hint: Is –CO2H anelectron-donating or an electron-withdrawing group?d. Reaction with CH3MgI (excess), ether; then H+/H2O e. Reaction with LiAlH4, ether; then H+/H2O f. Reaction with DIBAL (diisobutylaluminum hydride), toluene, low temperature; then H+/H2OWhat is the 1,4-addition product in the reaction eqaution below? What is the 1.2- additional product in the reaction below?