[ 16 ] which of following compound(s) is/are neither acetal nor hemiacetal ? он Но Он осH-CHз CHз ОН OCH3 (1) ( II ) ( III ) (IV ) (V) (a ) compounds III and V (b) compounds Il and II (c) compounds I and V (d ) compounds IV and V (e) compounds I and IV
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- Provide IUPAC names for the following compounds. (a) -OH (b)Phenylethanol can be oxidised to phenylethanal or phenylethanoic acid, depending on the reagents used (both the alcohol and the aldehyde are of interest for their antimicrobial properties, while the acid is used to treat type II hyperammonemia): A (a) (b) (c) CoH,CH,CHO phenylethanal B C6H5CH₂CH₂OHC₂H₂CH₂CO₂H phenylethanol Suggest reagents (shown as A and B in the scheme above) that could be used to carry out the oxidation of the alcohol to the aldehyde and the acid, respectively. C6H5CH₂- Suggest two other syntheses of phenylethanoic acid, in each case indicating the starting materials and other reagents required, but not giving details of mechanism. One of your proposed syntheses must start with a compound which only contains seven carbon atoms (the acid product contains eight carbon atoms). phenylethanoic acid Phenylethanal can be converted to a hydrate in the presence of aqueous acid, though the position of equilibrium is very far to the left: H H+/H₂O OH C6H5CH₂-C-H OH Explain why…For each pair of compounds, predict which compound has a higher boiling point. then explain why that compound has a higher boiling point. (a) isopropyl bromide and n-butyl bromide (b) isopropyl chloride and tert-butyl bromide (c) 1-bromobutane and 1-chlorobutane
- ive the structure and the correct IUPAC name for a compound that is representative of each of the following: (i) Acetal (ii) Alkoxide salt (iii) Cyanohydrin (iv) Secondary Amine (v) Tertiary Alcohol(A) Which of the following ethers is the least soluble in water? (B) Which produces ethanol and methyl iodide after treatment with dilute HI?Which of the following pure compounds can form hydrogen bonds? Which can form hydrogen bonds with water? Which ones do you expect to be soluble in water?(a) (CH3CH2CH2)2O (b) CH3(CH2)3CH3 (c) CH2“CH¬CH2CH3
- 19.62 Naltrexone is used to help recovering narcotic addicts stay drug free. HO O OH naltrexone LO1,6,7 (a) Label and name all the functional groups. Where relevant, indicate whether the group is primary, secondary or tertiary. (b) Upon addition of dilute hydrochloric acid solution, naltrexone forms a water-soluble salt. Draw the structure of this salt.Attenol A and pinnatoxin A are natural products isolated from marine sources. (a) Locate the acetals, hemiacetals, imines, and enamines in both compounds. (b) Draw the hydrolysis product formed when attenol A is treated with aqueous acid. Include stereochemistry at all stereogenic centers.Describe how would you distinguish the following pairs, (a) Benzene and cyclohexane (b) Phenol and toluene (c) Phenol and benzoic acid
- Which of the following is an acceptable name for the compound shown below? (A) meta-ethoxyacetophenone (B) meta-ethoxybenzaldehyde(C) meta-formylanisole (D) meta-ethylacetophenone5-Hydroxyhexanal forms a six-membered cyclic hemiacetal, which predominates at equilibrium in aqueous solution. (a) Draw a structural formula for this cyclic hemiacetal. (b) How many stereoisomers are possible for 5-hydroxyhexanal? (c) How many stereoisomers are possible for this cyclic hemiacetal? (d) Draw alternative chair conformations for each stereoisomer and label groups axial or Also predict which of the alternative chair conformations for each stereoisomer is more stable.The cis ketone A is isomerized to a trans ketone B with aqueous NaOH. A similar isomerization does not occur with ketone C. (a) Draw the structure of B using a chair cyclohexane. (b) Label the substituents in C as cis or trans, and explain the difference in reactivity.