CHEM 2211 1nd Edition Lecture 25 Outline of Last Lecture I Alkyne reactions Cont Outline of Current Lecture I Alkyne reactions finished Current Lecture Synthesis using Acetylide ions Only primary alkyl halides or methyl halides should be used in acetylide ion synthesis Reactions CH3CH2C C CH3CH2CH2Br CH3CH2C CCH2CH2CH3 BrThe highlighted area is what the acetylide ion attaches too Br breaks off cause it is more electronegative an shares electrons unevenly After Br breaks off C gets a partial positive charge o This charge attracts the negative charge on C in the acetylide ion o So the C attaches to the C and creates a synthesis combining of the two ions Acidic nature of hydrogen bonded to carbon Relative electronegativities of carbon atoms These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute Most o Sp o Sp2 o Sp3 Least The most acidic compound is the one bonded to the most electronegative atom This applies when the atoms are the same size o Like all carbons So the most acidic compound when comparing carbons would be Most o Hydrogens bonded to sp carbons o Sp2 carbons o Sp3 carbons Least
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