Synthesize a racemic sample of trans-2,3-diphenyloxirane (shown) using ethylene oxide and bromobenzene as your only sources of carbon.

7. Answer ALL parts of this question. (a) Answer BOTH parts of this question Reaction of the carboxylic acid below (Scheme Q7(a)) with bromine in the presence of dibenzoylperoxide gives rise to an unstable compound A (CSH&BR2O2) that gives a stable compound B on treatment with a base. The stable compound has IR peaks at 1735 and 1645 cm and NMR peaks at &H (ppm) 6.18 (1H, s), 5.00 (2H, s) and 4.18 (2H, s). Br. Base (PhCO, Scheme Q7(a) (1) What is the structure of the unstable compound A? (i) Show the mechanisms for the two steps in the reaction (b) Answer BOTH parts of this question Tetraphenylporhyrin (TPP) is a singlet sensitiser that reacts with oxygen and can engage in pericyclic reactions (Scheme Q7(b). OH O. TPP hv Scheme Q7(b) (i) Explain the difference between a singlet and a triplet state. (ii) Show the mechanism for the reaction shown in Scheme 07(b) (ii) Consider the below reaction (figure Q7(c)), Show the structure of the product (C) anc the mechanism Scheme Q7 (b)

Give detailed Solution with explanation needed..please explain

(c) Starting from benzene, propose a viable synthesis so that the ortho product formed below is the only product observed. For each step, show all necessary reagents/conditions and draw the major product expected after each step in your proposed synthesis.. ortho-product (only product observed)

Choose the right reagent or series of reagents from the ones listed to synthesize the following molecule (see picture) from benzene (C6H₁) or toluene (C6H5 CH₂). COOH NH₂ C6H₁ and HNO3, H₂SO4 followed by CH3 Cl, AlCl3 then KMnO4, A ○ C₁H₂CH3 and KMnO4, A, followed by HNO3, H₂SO4 ○ C6H₂ CH3 and HNO3, H₂SO4, followed by KMnO4, A, then Zn, HCI C6H₁ and CH3OH followed by KMnO4, A, then HNO3, H₂SO4 C6H₁ CH3 and HNO3, H₂SO4, followed by Zn, HC1

s) Propose a reasonable mechanism for the following reaction. 1) ONa 2) H3O+ js

(4) Provide the reagents necessary to carry out the following synthesis. + enantiomer (A) (1) (i) BH3, (ii) H₂O2, NaOH; (2) NaOEt JATOT (B) (1) (i) BH3, (ii) H₂O2, NaOH; (2) TsCl, pyridine; (3) KOC(CH3)3 (C) (1) H3O+, (2) TsCl, pyridine, (3) KOC(CH3)3 (D) (1) HBr (no peroxides); (2) NaOEt

Chemistry Please help explain this textbook question: Although N, N -dimethylaniline is extremely reactive toward electrophilic aromatic substitution and is readily substituted by weak electrophiles, such as diazonium and nitronium ions, this reactivity is greatly diminished by the introduction of an alkyl substituent in an ortho position.

Give detailed Solution with explanation

Give detailed Solution with explanation needed...don't give Handwritten answer