Alkenes and Alkynes - URI Department of Chemistry

More documents

Recommendations

Info

10/29/2010Electrophilic Addition Reactions of AlkenesAlternatively, we might write the same reaction in a format toemphasize that 2-methylpropene is the reactant whosechemistry is of greater interest. The second reactant, HCl, isplaced above the reaction arrow together with notes aboutsolvent and reaction conditions:Electrophilic Addition Reactions of AlkenesAlkynes also undergo electrophilic addition reactions• Reactivity is substantially less than that of alkenes7.7 Orientation of Electrophilic Addition:Markovnikov’s RuleRegiospecific reactions - reactions where only one oftwo possible orientations occursMarkovnikov’s Rule (Vladimir Markovnivov,1869)• In the addition of HX to an alkene, the H attaches to thecarbon with fewer alkyl substituents and the X attaches tothe carbon with more alkyl substituents6
10/29/2010Orientation of Electrophilic Addition:Markovnikov’s RuleOrientation of Electrophilic Addition:Markovnikov’s Rule• When both double-bond carbon atoms have the samedegree of substitution, a mixture of addition products resultsOrientation of Electrophilic Addition:Markovnikov’s Rule (Restated)Markovnikov’s rule (restated)• In the addition of HX to an alkene, the more highly substitutedcarbocation is formed as the intermediate rather than the less highlysubstituted one7
Page 1 and 2: 10/29/20107.5 Stability of AlkenesS
Page 3: 10/29/2010Stability of AlkenesAlken
Page 8 and 9: 10/29/2010Orientation of Electrophi
Page 10: 10/29/2010Carbocation Structure and

Alkenes and Alkynes - URI Department of Chemistry

Create successful ePaper yourself

Delete template?

Save as template?