Concept explainers
(a)
Interpretation:
Newman projections must be utilized to explain why trans-stilbene is the major product when (S)-1-bromo-1,2-diphenylethane is used.
Concept Introduction :
During the elimination reaction, anti-periplanar groups are removed to form a double bond. Newman projection is the representation of a molecule when it is viewed through a particular bond between two atoms.
(b)
Interpretation:
Newman projections must be utilized to explain why trans-stilbene is the major product when (R)-1-bromo-1,2-diphenylethane is employed.
Concept Introduction :
During the elimination reaction, anti-periplanar groups are removed to form a double bond. Newman projection is the representation of a molecule when it is viewed through a particular bond between two atoms.
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- Draw the products of the following reactions. If the products can exist as stereoisomers show what stereoisomers are formed. a. cis-2-pentene + Br2/CH2Cl2 b. trans-2-pentene + Br2/CH2Cl2 c. 1- butene + HCl d. methylcyclohexene + HBr e. trans-3-hexene + Br2/CH2Cl2 f. cis-3-hexene + Br2/CH2Cl2 g. 3,3-dimethyl-1-pentene + HBr h. cis-2-butene + HBr i. (Z)-2,3-dichloro-2-butene + H2, Pd/C j. (E)-2,3-dichloro-2-butene + H2, Pd/C k. (Z)-3,4-dimethyl-3-hexene + H2, Pd/C l. (E)-3,4-dimethyl-3-hexene + H2, Pd/Carrow_forward3. Draw the structures of the products, showing stereochemistry where relevant. a) 1-methylcyclohexene HBr b) Br2 1-methylcyclohexene Br2 1-methylcyclohexene → H2O 4. When bromine adds to the double bond in cyclohexene, the resulting dibromide is trans. This stereochemistry is due to: a) The intermediate bromonium ion d) Markovnikov's rule b) the intermediate carbocation d) IUPAC rulesarrow_forwardDraw the product of each electrocyclic reaction.a. the thermal electrocyclic ring closure of (2E,4Z,6Z)-nona-2,4,6-trieneb. the photochemical electrocyclic ring closure of (2E,4Z,6Z)-nona-2,4,6-trienec. the thermal electrocyclic ring opening of cis-5-ethyl-6-methylcyclohexa-1,3-diened. the photochemical electrocyclic ring opening of trans-5-ethyl-6-methylcyclohexa-1,3- dienearrow_forward
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