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Subsitution via SN1 mechansim help solve
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- Which type of reaction – addition, elimination, rearrangement, substitution,- best describes each of the following? OLi (а) MeLi + Me H (Б) Me2NOH + (c) to (d) H2O -ОН +Simple substitution reactions, CR3X + Z CR3Z + X often occur by one of two pathways, either a one-step mechanism or a two-step mechanism. (The R in the reaction can be a wide variety of C-containing groups that do not participate in the reaction.) Researchers run a substitution reaction in which an intermediate is observed. What, if anything, did they learn about the mechanism?In a time-resolved picosecond spectroscopy experiment, Sheps, Crowther, Carrier, and Crim (Journal of Physical Chemistry A, Vol. 110, 2006; pp. 30873092) generated chlorine atoms in the presence of pentane. The pentane was dissolved in dichloromethane, CH2C12. The chlorine atoms are free radicals and are very reactive. After a nanosecond the chlorine atoms have reacted with pentane molecules, removing a hydrogen atom to form HCl and leaving behind a pentane radical with a single unpaired electron. The equation is Cl (dcm) + C5H12(dcm) HCl(dcm) + C5H11 (dcm) where (dcm) indicates that a substance is dissolved in dichloromethane. Measurements of the concentration of chlorine atoms were made as a function of time at three different concentrations of pentane in the dichloromethane. These results are shown in the table. (a) Determine the order of the reaction with respect to chlorine. (b) Determine whether the reaction rate depends on the concentration of pentane in dichloromethane. If so, determine the order of the reaction with respect to pentane. (c) Explain why the concentration of pentane in dichloromethane does not affect the data analysis that you performed in part (a). (d) Write the rate law for the reaction and calculate the rate of reaction for a concentration of chlorine atoms equal to 1.0 M and a pentane concentration of 0.23 M. (e) Sheps, Crowther, Carrier, and Crim found that the rate of formation of HCl matched the rate of disappearance of Cl. From this they concluded that there were no intermediates and side reactions were not important. Explain the basis for this conclusion.
- 2,3-Dibromoprop-1-ene (C3H4Br2) has four H atoms. Suppose that any of these H atoms can be replaced by a Cl atom to yield a molecule with the formula C3H3Br,Cl. (a) Identify two H atoms where this substitution would yield constitutional isomers of C3H3Br,CI; (b) enantiomers of C3H3Br,Cl; (c) diastereomers of C3H3Br,Cl. H нн H Br Br 2,3-Dibromoprop-1-ene(a) NaBH4 (CH3)2CHCH2CH2CH CH3CH,OH (b)We have a hydrocarbon, C16H26. The compound has two triple bonds and the acids produced by ozonolysis are CH3(CH2)4CO2H and H2OCCH2CO2H. What is a likely structure for this hydrocarbon?
- Please help2) (4pts) Classify each reaction as addition, elimination, substitution, or rearrangement. A) CH;CH2B LIOH CH;CH2OH LiBr B) CH;CH2CH,Cl CH-CH-CH2 + + HCl C) CH;CH=CH2 H2 CH;CH2CH3 Verdana 10pt B IU A vClassify each of the following reactions as a substitution, elimination or addition reaction: Br Нeat (a) Br2 + HBr Br CN (b) + CN + Br Br (c) + Br2 Br