ORGANIC CHEMISTRY 3540

ELIMINATION REACTIONS

ALKYNES

ELIMINATION REACTIONS

DEHYDROHALOGENATION

CH₃CH₂Br + OH^-1 ---> CH₂=CH₂ + Br^-1 + H₂O
GENERALLY GET MIXTURES
(UNLESS HALOGEN IS ON THE END CARBON)

ZAITSEV'S RULE: ELIMINATION REACTIONS GENERALLY GIVE MORE OF THE MORE HIGHLY SUBSTITUTED ALKENE. (MORE STABLE ALKENE)

DEHYDRATION

CH₃CH₂OH + H⁺¹ ---> CH₂=CH₂ + H₂O
ALSO GET MIXTURES.
(EVEN IF -OH IS ON THE END CARBON)

ALKYNES

GENERAL FORMULA, C_nH_(2n-2)

COMMON NAME, THE ACETYLENES
sp HYBRID
180^o BOND ANGLES
SHORTEST AND "STRONGEST" C-C BOND
BUT REACTIVE LIKE ALKENES
CH₃CH₂CH₂CH₂C^_≡CH IS A TERMINAL ALKYNE
CH₃CH₂C^_≡CCH₂CH₃ IS AN INTERNAL ALKYNE

NOMENCLATURE

SAME RULES AS ALKENES EXCEPT "YNE" ENDING

WHAT ARE THE REACTIONS OF ALKENES?

ADDITION REACTIONS OF ALKYNES
REDUCTION/HYDROGENATION
ADDITION OF HX AND X₂
HYDRATION

ANION AS A NUCLEOPHILE

SYNTHESIS