Alkenes Reactions Flashcards
How can an alkene produce a hologenoalkane
HX polar conditions or HX peroxides
What is the Markovnikov rule
The favoured product is the hydrogen attached to the least sub carbon
What sort of reaction is the addition of HX with peroxides
Free radical
Anti markovnikov
What forms a dibromoalkane from alkene
Br2
What addition is bromination
Anti
What does bromination produce a racemic mixture
The bromide ion can attack either side of the bromonium ion
What conditions form a bromohydrin from alkene
Br2/ H2o
What step is reversible in addition of bromine water
1st and 3 rd
How can an alcohol be formed from an alkene
Hydroxylation - H2o and acid catalyst
Oxymercuration - mercury accetate
Hydroboration - bh3, h2o2
Why is hydroxylation of alkene not the favoured method for producing an alcohol
All steps are reversible
In oxymercuration what is required at each step
Mercury acetate
Water
Sodium borahydride
What is the product of hydroboration
3 mol of alcohol from 3 mol of alkene and 1 mol bh3
What sort of addition is hydroboration
Anti markovnikov
At which carbon does the BH2 addition occur in hydroboration
The least hindered
What are the reagents for epoxidation
Percarboxylic acid and water and acid
What is formed in epoxidation
Trans diol
What colour change is observed in dihydroxylation
Purple to brown +7 to +4
What is the product of dihrdoxylation
Syn diol
What are the reagents of dihydroxylation
KMnO4 and water
What is another name for dihydroxylation
Baeyer test
What is another reagent for dihydroxylation
OsO4 and NaHSO3
What is the name of the intermediates produced in dihydroxylation
Manganate Ester and osmate ester
What is the specificity / selectivity of dihydroxylation
Stereospecific
What are the reagents of ozonlysis
O3 and Me2S
