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��
|
|
H2 / Lindlar |
H3C |
|
|
CH3 |
|
CH C
3
|
C CH3 |
Catalyst |
H |
C |
C |
H |
Na / NH 3 ( liq .) H3C CH3C C CH3 C C
H
H
CH3
Addition of Halogens : -
|
|
|
Br Br |
HC |
CH |
2Br 2 |
| |
H C C H
|
Addition of hydrogen halides : -
| | Br Br
HC
CH2HBr
CH3 CH Br2
Addition of water ( Hydration ): - Acid catalyzed addition of water
HC CH + H O
|
|
H O / H +
2
|
CH3C |
C CH3 |
HgSO
4
|
2
HgSO4
CH2 CHOH CH CHO
3
H2SO4 Unstable O
CH3 C CH2CH3
O O
H O / H +
CH3C CCH CH 2 CH CH CCH CH + CH3CCH2CH2CH3
2 3 3 2 2 3
HgSO4 ( Major ) ( Minor )
5 . Polymerisation-
Linear polymerisation : of ethyne gives polyacetylene or polyethyne which is a high molecular weight polyene containing repeating units of ( CH = CH – CH = CH ) and can be represented as —( CH = CH – CH = CH ) n —