Interpretation:
The
Concept introduction:
During epoxidation an oxygen atom is transferred to the double bond in alkene with syn stereochemistry. Both C-O bonds are formed o the same face of the double bond. The
The hydroxylation with OsO4 also occurs with syn stereochemistry. The addition of OsO4 to the alkene gives a cyclic osmate which is cleaved by using aqueous NaHSO3 to yield a cis-1,2-diol.
To state:
The alkene from which the alcohol shown can be prepared. Further to state, among epoxide hydrolysis and OsO4, the method which can be used to prepare the diol.
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Chapter 8 Solutions
Organic Chemistry
- When 2-bromo-3-phenylbutane is treated with sodium methoxide, two alkenes result (by E2 elimination). The Zaitsevproduct predominates.(a) Draw the reaction, showing the major and minor products.(b) When one pure stereoisomer of 2-bromo-3-phenylbutane reacts, one pure stereoisomer of the major product results.For example, when (2R,3R)-2-bromo-3-phenylbutane reacts, the product is the stereoisomer with the methyl groups cis.Use your models to draw a Newman projection of the transition state to show why this stereospecificity is observedarrow_forwardThe transformation takes place via two sequential pericyclic reactions. Identify the two reactions and give a critical explanation whether the reactions are allowable or not. Explain the stereochemistry.arrow_forwardIdentify the following pericyclic reaction; explain the course, product distribution and stereochemistry of the reaction. Where the first product is produced 70% and the second product is produced 30%.arrow_forward
- Identify the following pericyclic reaction; explain the course and stereochemistry of the reaction.arrow_forwardThe bicyclic alkene P can be prepared by thermal electrocyclic ring closure from cyclodecadiene Q or by photochemical electrocyclic ring closure from cyclodecadiene R. Draw the structures of Q and R, and indicate the stereochemistry of the process by which each reaction occurs.arrow_forward(a) What product(s) are formed when the E isomer of C6H5CH = CHC6H5 is treated with Br2, followed by one equivalent of KOH? Label the resulting alkene(s) as E or Z. (b) What product(s) are formed when the Z isomer of C6H5CH = CHC6H5 is subjected to the same reaction sequence? (c) How are the compounds in parts (a) and (b) related to each other?arrow_forward
- Consider a reaction where cis-but-2-ene is treated with OsO4 followed by NaHSO3/H2O. Draw the structure of one product that is formed in the reaction, including correct stereochemistry.arrow_forwardWhen treated with NaOH, the bromide below gives an alkene by the E2 mechanism, by elimination of the H atom indicated by the arrow: (a) Draw the Newman projection from which elimination takes place. (b) Draw the mechanism. (c) Draw the product with the proper stereochemistry. (d) Assign the proper stereochemical descriptor to the product. (e) Give the rate equationarrow_forwardDraw the alkene that would react with the reagent given to account for the product formed. ? + H₂O H₂SO4 CH3 CH3 CHCCH3 OH CH3 • You do not have to consider stereochemistry. • You do not have to explicitly draw H atoms. • In cases where there is more than one answer, just draw one. Sn [F ChemDoodlearrow_forward
- МСРВА Alkenes are oxidized to give epoxides on treatment with a peroxyacid, RCO3H, such as metachloroperoxybenzoic acid (MCPBA). Peroxyacids transfer an oxygen atom to the alkene with syn stereochemistry, i.e. both C-O bonds form on the same face of the double bond, through a single step mechanism without intermediates. The oxygen atom farthest from the carbonyl group is the one transferred. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instructions H .CI .CI HOarrow_forward(a) Draw the products (including stereoisomers) formed when 2methylhex-2-ene is treated with HBr in the presence of peroxides. (b) Draw the products (including stereoisomers) formed when (S)-2,4dimethylhex-2-ene is treated with HBr and peroxides under similar conditions.arrow_forwardTwo products are formed when methylenecyclohexane reacts with NBS? Show how each is formed. Disregard stereoisomers.arrow_forward
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