16.1 Synthetic Routes Flashcards
Alkene -> Haloalkane
Hydrogen halide at RTP (halogenation)
Alcohol -> Haloalkane
Substitution reaction
Heated under reflux
Sodium halide + H2SO4
(Hydrogen halide formed in situ, which reacts with alcohol to form haloalkane)
Alkane -> Haloalkane
Radical substitution
Halogen + UV
Alkene -> Alkane
H2, in the presence of Ni catalyst at 423K
Hydrogenation reaction
Haloalkane -> Alcohol
NaOH (Aq), heat under reflux
Hydrolysis (nucleophilic substitution)
Alcohol -> Alkene
Heated under reflux
Concentrated H3PO4
Dehydration elimination reaction
Alkene -> Alcohol
H2O (g) + H3PO4 / Phosphoric (V) acid Catalyst
300 degrees C, 60-70 atm
Hydration reaction
Primary alcohol -> Carboxylic acid
K2Cr2O7/H2SO4 + heat under reflux
Colour change orange -> green
Primary alcohol -> Aldehyde
K2Cr2O7/H2SO4 + heat gently, distil immediately
Colour change orange -> green
Secondary alcohol -> Ketone
K2Cr2O7/H2SO4 + Heat under reflux
Colour change orange -> green
Aldehyde -> Primary alcohol
Warmed in an aqueous solution with a reducing agent, e.g. Sodium tetrahybridoborate
NaBH4/H2O
Ketone -> Secondary alcohol
Warmed in an aqueous solution with a reducing agent, e.g. Sodium tetrahybridoborate
NaBH4/H2O
Aldehyde -> Hydroxynitrile
Sodium cyanide + sulfuric acid (H2SO4/NaCN)
Forms HCN, then CN- nucleophile in situ
Ketone -> Hydroxynitrile
Sodium cyanide + sulfuric acid (H2SO4/NaCN)
Forms HCN, then CN- nucleophile in situ
Acyl chloride -> Ester
Nucleophilic acyl substitution
Heat with alcohol or phenol under reflux
Acyl chloride -> carboxylic acid
Nucleophilic acyl substitution
Heat with water under reflux
Acyl chloride -> amide
Nucleophilic acyl substitution
Heat with ammonia or amine under reflux, depending on target molecule.
Acid anhydride -> Ester
Nucleophilic acyl substitution
Heat with alcohol/phenol under reflux.
Acid anhydride -> Carboxylic acid
Nucleophilic acyl substitution
Heat with water under reflux.
Acid anhydride -> amide
Nucleophilic acyl substitution
Heat with ammonia/amine under reflux.
Ester -> carboxylic acid
Acid hydrolysis
Nucleophilic acyl substitution
Reflux with dilute aqueous acid
Ester -> carboxylate salt
Saponification/alkaline hydrolysis
Heat with NaOH under reflux
Primary Haloalkane -> Primary amine
Reagents: Excess ammonia, ethanol solvent, NaOH
Step 1: Primary haloalkane + ammonia -> alkylammonium salt
Step 2: Alkylammonium salt + NaOH -> primary amine + water + sodium halide
Haloalkane -> Nitrile
Nucleophilic substitution
NaCN/KCN in ethanol solvent
Optionally heat under reflux to increase rate
Nitrile -> Amine
React with 2 H2 (per nitrile group) in the presence of a nickel catalyst
High temperature and pressure
Nitrile -> carboxylic acid
Hydrolysis reaction
Heat with dilute aqueous acid, e.g. HCl (aq)
Amino acid -> Ester
React with alcohol and strong acid catalyst (Usually H2SO4)