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Briefly indicate the structural differences between isopolianions and heteropolianions.
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- why is cyclopentadiene more acidic than cycloheptatriene?Which of the following statements is/are True? A. The addition of Br2 to a cis-alkene would result to the formation of a pair of enantiomers B. The addition of Br2 to a trans-alkene would result to the formation of a pair of enantiomers C. The addition of Br2 to a cis-alkene would result to the formation of a meso compound D. The addition of Br2 to a trans-alkene would result to the formation of a meso compound.Give evidence, through specific examples (research on the internet), to support the carbocation mechanism. include Markovnikov’s rule and Hammond’s postulate when providing the examples.
- Draw the structure of chloric and chlorous acid and predict their pKa values using Pauling's rules.Draw the structure of zinc (E)-3-cyclohexylacrylate. • Consider E/Z stereochemistry of alkenes. Draw cations and anions in separate sketchers.In 1935, J. Bredt, a German chemist, proposed that a bicycloalkene could not have a double bond at a bridgehead carbon unless one of the rings contains at least eight carbons. This is known as Bredt’s rule. Explain why there cannot be a double bond at this position.
- The synthesis of carbohydrates can be particularly difficult because of the large number of chiral centers and OH functional groups present. Epoxides can be useful synthetic intermediates in carbohydrate synthesis. Draw the product of the reaction of a phenyl Gilman reagent with this epoxide. Aa • Use the wedge/hash bond tools to indicate stereochemistry where it exists. Explicitly define the cis/trans stereochemistry of fused rings using wedge or hash bonds. If enantiomers are formed, draw both. Separate multiple products using the sign from the drop-down menu. .The synthesis of carbohydrates can be particularly difficult because of the large number of chiral centers and OH functional groups present. Epoxides can be useful synthetic intermediates in carbohydrate synthesis. Draw the product of the reaction of a phenyl Gilman reagent with this epoxide. QAO • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Explicitly define the cis/trans stereochemistry of fused rings using wedge or hash bonds. • If enantiomers are formed, draw both. • Separate multiple products using the sign from the drop-down menu. + e./ 8) 16224 000. ItEncircle the functional groups found in Betacarotene and explain each of their purposes in the compound thoroughly
- For the formula C6H₁4, calculate the index of hydrogen deficiency (IHD) and select all the types of unsaturation that might be present in the molecule based on the IHD. The IHD is Which types of unsaturation might be present? three double bonds or three ring closings; or two double bonds and one ring closing; or one double bond and two ring closings; or one triple bond and one double bond; or one triple bond and one ring closing no unsaturation; no multiple bonds or ring closings one double bond or one ring closing many possibilities; most likely a benzene ringWhich of the following distinguished scientists is correctly identified? There may be more than one correct answer. Adolf von Baeyer proposed the importance of ring strain Louis Vuitton separated crystals of tartaric acid and hence isolated enantiomers of tartaric acid Vladimir Prelog worked with Robert S. Cahn and Sir Christopher Ingold to establish the Cahn-Ingold-Prelog priority system for nomenclature Emil Fischer invented the Fischer projection to facilitate the depiction of stereochemical relationships.Which of the following is not an electrophile * AIB13 BF3 SnCl4 NH3
