(b) Treating cyclohexene with HBr in the presence of acetic acid gives bromocyclohexane (85%) and cyclohexyl acetate (15%). Propose a mechanism for the formation of the latter product using curly arrows. Lon, Br оссн, CH,COH + HBr 85% 15%
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- A step in a synthesis of PGE1 (prostaglandin E1, alprostadil) is the reaction of a trisubstituted cyclohexene with bromine to form a bromolactone. Propose a mechanism for formation of this bromolactone and account for the observed stereochemistry of each substituent on the cyclohexane ring. Alprostadil is used as a temporary therapy for infants born with congenital heart defects that restrict pulmonary blood flow. It brings about dilation of the ductus arteriosus, which in turn increases blood flow in the lungs and blood oxygenation.In a strongly acidic solution, cyclohexa-1,4-diene tautomerizes to cyclohexa-1,3-diene.Propose a mechanism for this rearrangement, and explain why it is energetically favorable.PWhen buta-1,3-diene (CH2 = CH – CH = CH2) is treated with HBr, two constitutional isomers are formed, CH3CHBrCH = CH2 and BrCH2CH = CHCH3. Draw a stepwise mechanism that accounts for the formation of both products.
- 1. Deduce the structure of each compound from the information given. All unknowns in this problem have molecular formula C8H12. (a) Upon catalytic hydrogenation, unknown W gives cyclooctane. Ozonolysis of W, followed by reduction with dimethylsulfide, gives octanedioic acid, HOOC—(CH2)6—COOH. Draw the structure of W. (b) Upon catalytic hydrogenation, unknown X gives cyclooctane. Ozonolysis of X, followed by reduction with dimethyl sulfide, gives two equivalents of butanedial, O=CH—CH2CH2—CH=O. Draw the structure of X.Deduce the structure of each compound from the information given. All unknowns in this problem have molecularformula C8H12.(a) Upon catalytic hydrogenation, unknown W gives cyclooctane. Ozonolysis of W, followed by reduction with dimethylsulfide, gives octanedioic acid, HOOC¬(CH2)6¬COOH. Draw the structure of W.(b) Upon catalytic hydrogenation, unknown X gives cyclooctane. Ozonolysis of X, followed by reduction with dimethylsulfide, gives two equivalents of butanedial, O“CH¬CH2CH2¬CH“O. Draw the structure of X.(c) Upon catalytic hydrogenation, unknown Y gives cyclooctane. Ozonolysis of Y, followed by reduction with dimethylsulfide, gives a three-carbon dialdehyde and a five-carbon dialdehyde. Draw the structure of Y.*(d) Upon catalytic hydrogenation, unknown Z gives cis-bicyclo[4.2.0]octane. Ozonolysis of Z, followed by reductionwith dimethyl sulfide, gives a cyclobutane with a three-carbon aldehyde (¬CH2¬CH2¬CHO) group on C1 and aone-carbon aldehyde (¬CHO) group on C2. Draw the…Give to all parts? (a) Give the complete mechanism for the reaction of trans-2-butene with Br2 in excess H2O. (b) Name the products (including stereochemistry). (c) Give the complete mechanism for the reaction of trans-2-butene with Br2 in excess H2O. (d) Name the products (including stereochemistry).
- Compound A (C7H11Br) is treated with magnesium in ether to give B (C7H11MgBr) which reacts violently with D2O to give 1-methylcyclohexene with a deuterium atom on the methyl group (C). Reaction of B with acetone (Ch3COCH3) followed by hydrolysis gives D (C10H18O). Heating D with concentrated H2SO4 gives E (C10H16), which reacts with 2 equivalents of Br2 to give F (C10H16Br4). E undergoes hydrogenation with excess H2 and Pt catalyst to give 2-methylpropylcyclohexane. Determine the structures of compounds A through F, and show your reasoning throughout.Compound A (C7H11Br) is treated with magnesium in ether to give B (C7H11MgBr), which reacts violently with D2O togive 1-methylcyclohexene with a deuterium atom on the methyl group (C). Reaction of B with acetone (CH3COCH3)followed by hydrolysis gives D (C10H18O). Heating D with concentrated H2SO4 gives E (C10H16), which decolorizestwo equivalents of Br2 to give F (C10H16Br4). E undergoes hydrogenation with excess H2 and a Pt catalyst to giveisobutylcyclohexane. Determine the structures of compounds A through F, and show your reasoning throughoutDraw the mechanisms Treatment of ‘1-butene’ with HCl/H2O gives ‘B’ Treatment of ‘1-butene’ with cold KMnO4/ -OH gives ‘C’ Treatment of ‘1-butene’ with Hot KMnO4/-OH gives ‘D’ followed by acidification of the mixture to give ‘E’
- 2-bromopentane, when treated with alcoholic KOH yields a mixture of three alkenes A, B and C. Identify A, B and C. Which is predominant?Deduce the structure of each compound from the information given. All unknowns in this problem have molecularformula C8H12.(a) Upon catalytic hydrogenation, unknown W gives cyclooctane. Ozonolysis of W, followed by reduction with dimethylsulfide, gives octanedioic acid, HOOC¬(CH2)6¬COOH. Draw the structure of WCompound A (C7H11Br) is treated with magnesium in ether to give B (C7H11MgBr), which reacts violently with D2O to give 1-methylcyclohexene with a deuterium atom on the methyl group (C). Reaction of B with acetone (CH3COCH3) followed by hydrolysis gives D (C10H18O). Heating D with concentrated H2 SO4 gives E (C10 H16), which decolorizes two equivalents of Br2 to give F (C10H16 Br4). E undergoes hydrogenation with excess H2 and a Pt catalyst to give isobutylcyclohexane. Determine the structures of compounds A through F, and show your reasoning throughout.