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SCAN0002 - Ch 6 Reactions of Alkenes Addition Reactions 6...

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Unformatted text preview: Ch. 6: Reactions of Alkenes: Addition Reactions 6 The characteristic reaction of alkenes is addition to the double bond. \__/ I | 0—0 + E-Y --—-> E—C—C—Y /\ || \___/ ll C-—-—C + A—B —-—> A—C-“C—B / \ | l 1)Hydrogenation (Addition of H-H) Add M +13 MW % $6.3 Z -_-———'——’ _ Conditions: H2, Pt, EtOH (Also Pd, Ni, Rh, Ru) OLX‘KOL NA Heats of Hydrogenation vs. Alkene Stability T6.1, F6.1 Heats of hydrogenation can be measured and used to assess the stability of various types of double bonds (relative stability of isomeric alkenes). See table 6.1 ¥$ yr“ mfl. dccrcasin heat of h drocnation an increasin stabili \. CH2=CH2 RCH=CH2 RCH=CHR R20=CHR R20=CR2 of the double bond ethylene Monosubstituted Disubstituted Trisubstituted Tetrasubstitutcd more substituted = more stable trans more stable than cis Hydrogenation is a stereospecific syn addition 6.3, M6.1 . @ addition of both H atoms to double bond (both hydrogens add on the -of the double bond. 002C2H5 H2, Pt _—._+ 002C2H5 ...
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