2.6 What is the IUPAC name for the product of (R)-3-iodo-2,3-dimethylpentane with the anion of acetylene? 2.7 What is the IUPAC name for the product of (S)-2-iodopropanenitrile (aka (S)-1-cyano-1- iodoethane) with (CH3),CuLi?
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- Explain why heats of hydrogenation cannot be used to determine the relative stability of 2-methylpent-2-ene and 3-methylpent-1-ene. A, B, and C, each subjected to hydrogenation. The number of rings and π bonds refers to the reactant (A, B, or C) prior to hydrogenation.A chiral alkyne A with molecular formula C6H10 is reduced with H2 and Lindlar catalyst to B having the R conguration at its stereogenic center. What are the structures of A and B?Write a structural formula and give two acceptable IUPAC names for each alkene of molecular formula C7H14 that has a tetrasubstituted double bond.
- It is sometimes necessary to isomerize a cis alkene to a trans alkene in asynthesis, a process that cannot be accomplished in a single step. Usingthe reactions , devise a stepwise method to convert cis-but-2-ene to trans-but-2-ene.Explain why the addition of HBr to alkenes A and C is regioselective, forming addition products B and D, respectively.Explain why the addition of HBr to alkenes A and C is regioselective,forming addition products B and D, respectively.
- What alkene yields A and B when it is treated with Br2 in CCl4?(a) What is the major alkene formed when A is dehydrated with HS2O4? (b) What is the major alkene formed when A is treated with POCl3 and pyridine? Explain why the major product is different in these reactions.In addition to using CHX3 and base to synthesize dihalocarbenes, dichlorocarbene (:CCl2) can be prepared by heating sodium trichloroacetate. Draw a stepwise mechanism for this reaction.
- Write IUPAC names including the configuration (R or S in parenthesis, case sensitive) for the following newman's structure.Give the IUPAC name for the following compound. Be sure to indicate stereochemistry where necessary.Write an example where you can illustrate the application of the Cahn Ingold Prelog rules to assign the stereochemistry around a C = C double bond