Considering which of the OH groups should be more accessible to MsCl, suggest a mechanism for the rearrangement of the cyclobutane to the cyclopentane. Me Me Me Me Et3N, MSCI OH -30 to 4 °C OH Me Me
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- Cembrene, C20H32, is a diterpenoid hydrocarbon isolated from pine resin. Cembrene has a UV absorption at 245 nm, but dihydrocembrene (C20H34), the product of hydrogenation with 1 equivalent of H2, has no UV absorption. On exhaustive hydrogenation, 4 equivalents of H2 react, and octahydrocembrene, C20H40, is produced. On ozonolysis of cembrene, followed by treatment of the ozonide with zinc, four carbonylcontaining products are obtained: Propose a structure for cembrene that is consistent with its formation from geranylgeranyl diphosphate.+ H3C- CH₂ - CH2 - COR and have undergone McLafferty rearrangement and Ortho effect respectively. What are the possible fragments obtained as a result of these processes ? COOCH3 OH + (A) [R-CH₂-C (A) R-CH₂-CH₂ - CH₂ - COH @E OH]: [c C6H4 O and CO (B) H₂C=CROH and H₂C = CH₂ [2] : [ C₂H4O3 and CH4 (C) (D) H₂CCROH and C₂H4; [(C6H4O), CO and CH₂OH] RH, C₂H4 and CH₂CO; [(C₂H4O), CO and CH₂OH]QII: Give plausible mechanism for the following reaction: HCI Н ииии Он Н ииии CI + H mmCI ZnCl,
- Qa 18. Bromination of 5a-cholestan-3-one occurs at C-2 or C-4 to give 2 regioisomers. Two unsaturated ketones with lambdamax = 230 nm and lambdamax = 241 nm are yielded during dehydrobromination. Use Woodward-Fieser rules to distinguish between the two.Identify the major prouct of the folowing sololvsi reaction of 3bromo-1-methyiycopentene with methanol, Br CH,OH toThe reaction of 1- methylcyclopentene with mercuric trifluoroacetate in ethanol followed by reduction with sodium borohydride gives 1-ethoxy-1- methylcyclopentane. The -OH peak in the IR shows up at 1700 cm-1 as a sharp peak. (S)-2-bromohexane is the product of the reaction of (S)-2-hexanol with PBr3. The 1H NMR spectrum of 1- pentanol will show a peak for the H atom of the -OH group at 10 ppm delta. A tosylate is a great protecting group for an alcohol. The Williamson ether synthesis is an SN2 reaction of an alkoxide ion with a primary alkyl halide. Thionyl chloride converts ketones into alkyl halides. In an oxidation reaction, the oxygen content of our organic molecule decreases. ✓ [Choose ] False True [Choose ] [Choose ] [Choose ] [Choose ] [Choose ] [Choose ] [Choose ]
- Butanone is formed when an alkyne is passed through a dil sol of H2SO4at 330K in presence of mercuric sulphate. Write the possible structure of the alkyne.(a) Provide the missing reagents and line structures of the products (C- E) for the following reactions. Include stereochemistry for products Cand E as indicated. No mechanisms are required. (5) C H,0 Show stereochemistry any one diastereomer OH PCC. CH;Cla D H. Pd/C Show stereochemistry any one enantlomer> acetone > ethane - Two molecular ions H3C-CH₂-CH₂-COR and have undergone McLafferty rearrangement and Ortho effect respectively. What are the possible fragments obtained as a result of these processes ? COOCH3 OH + -COH]: [CH₂O and Co] CO (A) (B) x] : [GH₂C (C) RH, C₂H₂ and CH₂CO: [(CH₂O), CO and CH₂OH] (D) H₂CCROH and C₂H4; [(CH₂O), CO and CH₂OH] R-CH₂-CH₂ - CH₂ - COH H₂C=CR = CROH and H₂C = CH₂ C₂H403 and CH4 P.T.O.
- The dragmacidin class of natural products has been isolated from various marine sponges. They have been shown to have many interesting biological properties, including anti-viral, anti-fungal, and anti-bacterial activity. (+)- Dragmacidin D, shown below, was also made in the laboratory, which allowed the structure to be confirmed (Org. Lett. 2015, 17, 1529-1532). Part 1 ΗΘΗ H-N N-H * (-6) R (+)-Dragmacidin D R = "N-H The positive charge in dragmacidin D is delocalized. Draw all resonance structures that show delocalization of this charge, by modifying the given structures as needed. Include the original structure as one of the possible resonance forms, and include relevant formal charges in your structures. Do not add any resonance arrows or curved arrows. Use the + and - tools to add/remove charges to an atom, and use the single bond tool to add/remove double bonds. Br -H1) In the following reactions, give the nature and possibly the stereochemistry of A1, A2 and B and justify the proportions obtained. 4 1=3 |=1 CI ull OH KOtBu 3 DMSO H₂SO4 majority A1 A1 + 2)When the first compound is treated with MeONa in methanol, compounds A1 and B are also obtained, as well as a higher molecular weight compound C, which has a higher molecular weight. B are also obtained as well as a higher molecular weight compound C whose 1H NMR spectrum is given below. Justify the formation of C. 2 PPM equimolar mixture + isomere of A1 1=3 mobilie B A2 1=3 1=3 1 1=3 O(10pts) Compound A, C10H16, was found to be optically active. On catalytic reduction over a palladium catalyst, 2 equivalents of hydrogen were absorbed, yielding compound B, CioH2o. On ozonolysis of A, two fragments were obtained. One fragment was identified as acetic acid (CHCOOH). The other fragment, compound C, was an optically active carboxylic acid, C8H14O2. Write reactions, and draw the correct structures for A-C, explain your answer in detail.
