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Draw all the major products resulting from the reactions below, taking into consideration both the regioselectivity and stereoselectivity of the reactions. If pairs of enantiomers form, draw both enantiomers. Br₂ CH3CH₂OH (in large excess) H₂, Pd/C

Draw all the major products resulting from the reactions below, taking into consideration both the regioselectivity and stereoselectivity of the reactions. If pairs of enantiomers form, draw both enantiomers. Br₂ CH3CH₂OH (in large excess) H₂, Pd/C

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**Educational Transcription and Explanation** **Text Explanation:** The image prompts the reader to draw all major products from two separate chemical reactions, taking into account the regioselectivity and stereoselectivity. Additionally, if enantiomers form, the viewer is instructed to draw both. **Reaction 1:** - **Reagents and Conditions:** - Starting Material: Styrene (a benzene ring attached to an ethenyl group, with a methyl group). - Reagent: \( \text{Br}_2 \) (bromine) in large excess of ethanol (\(\text{CH}_3\text{CH}_2\text{OH}\)). **Reaction 2:** - **Reagents and Conditions:** - Starting Material: The same as in Reaction 1, a styrene derivative. - Reagent: Hydrogen gas (\(\text{H}_2\)) with palladium on carbon (Pd/C) as the catalyst. **Graph/Diagram Explanation:** There are no graphs or complex diagrams in the image. The reactions listed involve organic molecular structures where the transformations will need to be written out or drawn based on the chemical reactions provided. For educational purposes: 1. **Bromination Reaction Explanation:** - **Major Products:** Ethanol acts as a solvent and a nucleophile. The bromine will add across the double bond in an anti-addition manner to form the dibromo product. Regioselectivity must be considered to form the stable product. - **Stereochemistry:** The anti-addition of bromine could result in enantiomers, depending on the stereochemistry of the original alkene. 2. **Hydrogenation Reaction Explanation:** - **Major Products:** The alkene group in styrene is reduced to an alkane using hydrogen gas with Pd/C. This reaction typically results in syn-addition. - **Stereochemistry:** Since hydrogenation tends to be stereospecific, anticipate syn addition, but here, as a reduction to an alkene group, stereochemistry might not apply similarly as hydrogenation in cyclic systems. By analyzing both reactions’ regioselectivity and stereoselectivity, one can predict and draw all possible major products.
Transcribed Image Text:**Educational Transcription and Explanation** **Text Explanation:** The image prompts the reader to draw all major products from two separate chemical reactions, taking into account the regioselectivity and stereoselectivity. Additionally, if enantiomers form, the viewer is instructed to draw both. **Reaction 1:** - **Reagents and Conditions:** - Starting Material: Styrene (a benzene ring attached to an ethenyl group, with a methyl group). - Reagent: \( \text{Br}_2 \) (bromine) in large excess of ethanol (\(\text{CH}_3\text{CH}_2\text{OH}\)). **Reaction 2:** - **Reagents and Conditions:** - Starting Material: The same as in Reaction 1, a styrene derivative. - Reagent: Hydrogen gas (\(\text{H}_2\)) with palladium on carbon (Pd/C) as the catalyst. **Graph/Diagram Explanation:** There are no graphs or complex diagrams in the image. The reactions listed involve organic molecular structures where the transformations will need to be written out or drawn based on the chemical reactions provided. For educational purposes: 1. **Bromination Reaction Explanation:** - **Major Products:** Ethanol acts as a solvent and a nucleophile. The bromine will add across the double bond in an anti-addition manner to form the dibromo product. Regioselectivity must be considered to form the stable product. - **Stereochemistry:** The anti-addition of bromine could result in enantiomers, depending on the stereochemistry of the original alkene. 2. **Hydrogenation Reaction Explanation:** - **Major Products:** The alkene group in styrene is reduced to an alkane using hydrogen gas with Pd/C. This reaction typically results in syn-addition. - **Stereochemistry:** Since hydrogenation tends to be stereospecific, anticipate syn addition, but here, as a reduction to an alkene group, stereochemistry might not apply similarly as hydrogenation in cyclic systems. By analyzing both reactions’ regioselectivity and stereoselectivity, one can predict and draw all possible major products.
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