Hydrocarbons Flashcards
NH2NH2-H2O2
reduces only C=C bonds
LiAlH4 gives
H- anion
P+HI or
hot HI
hot HI or
P+HI
Hot HI or P+HI:
R-OH+HI------->RI+H2O
|
| (HI)
vR-H
for one mole of alcohol,x moles of hot HI is required
x=?
2
medium for wolff kishner reduction and what it means to you
base medium
OH- will attack the EWG groups present in substrate
meanwhile, C=O will reduce to single bond CH2-CH2
Wurtz reaction
1) Mg/Et2O
2) Mg/THF
differences in two reagents used and which is preferred
1) cannot break resonance stabilized bonds
2) breaks resonance stabilized bonds
THF is preffered
intermediate type formed in wurtz reaction
negative charge on carbon with leaving group
grignard reagent is unstable in _____ solvent. Why?
In PROTIC reagent. because,H of protic solvent will react with the reagent and hence leading to formation of an alakane
highly undesirable
Aromatisation?
using Cro3/Al2O3
H3C-CH2-CH2-CH2-CH2-CH3 undergoing aromatization
also mention how many moles of H2 will be release
benzene+ 4 H2
Octane number
efficiency of a fuel
BTX?
used?
Benzene
Toluene
Xylene
increases efficiency of a fuel/increases octane number
non-terminal alkynes are
(no hydrogen at end)
\_\_\_\_\_(reduced/non-reduced)
[BY LIQ.NH3/Na)
terminal alkynes are not \_\_\_\_(""""")reduced
non-reduced
terminal alkenes can be ____ by liq.NH3/Na
reduced
eg. CH3-CH=CH2—–> CH3-CH2-CH3
DEHYDRATION USING CONC.____
WRITE MECHANISM
Intermediate formed?
H2So4
write reaction
A carbocation
two charecterstics of dehydration by Al2O3
1) no carbocation formed
2) E2 rn
3) saytzeff major product
Dehydration by ThO2
a) type of mechanism?
b) major product formed
a) E2
b) Hoffman
CH3CH2CH(OH)CH3
- —————>
a) reagent: ThO2/heat
b) reagent: Al2O3
write it on your own
a) hoffman major
b) saytzeff major
relation between attacking reagent in dehydration and basicity
chances of getting hoffman product increases as crowding increases
pyrolysis of ester
heating of ester
WITH MECHANISM
CH3-CH2-O-C=O-CH3————>
heat
solution
https://www.youtube.com/watch?v=AlA46WFt9HA
VERY IMPORANT
HUGH PRIORITY
CO+H2+CH2=CH2——->?
step 1: from CO & H2 we get HCHO
and then prins reaction goes on
