Is halohydrin anti addition?
Formation of the Halohydrin Water must approach from the opposite face of the molecule given that the bromonium bridge will stand in the way of attack from the same face of the molecule. This is the anti-addition.
Where does Cl2 add to an alkene?
Reaction Overview: The alkene halogenation reaction, specifically bromination or chlorination, is one in which a dihalide such as Cl2 or Br2 is added to a molecule after breaking the carbon to carbon double bond. The halides add to neighboring carbons from opposite faces of the molecule.
Is a halohydrin an alcohol?
In organic chemistry a halohydrin (also a haloalcohol or β-halo alcohol) is a functional group in which a halogen and a hydroxyl are bonded to adjacent carbon atoms, which otherwise bear only hydrogen or hydrocarbyl groups (e.g. 2-chloroethanol, 3-chloropropane-1,2-diol).
What does THF do in a reaction?
In the presence of a solid acid catalyst, THF reacts with hydrogen sulfide to give tetrahydrothiophene.
Is epoxidation syn or anti?
The epoxidation reaction is believed to occur in a single step with a transition state incorporating all of the bonding events shown in the equation. Consequently, epoxidations by peracids always have syn-stereoselectivity, and seldom give structural rearrangement.
What happens when chlorine is added to an alkene?
Explanation: As the non polar chlorine molecule approaches the alkene double bond a dipole is induced in the halogen molecule. The pi bond in the alkene double bond breaks and forms a bond to the delta positive Cl atom, causing the Cl – Cl Bond to break a generating a chloride ion.
What is the purpose of electrophilic addition?
Electrophilic addition reactions are an important class of reactions that allow the interconversion of C=C and C≡C into a range of important functional groups including alkyl halides and alcohols. Conceptually, addition is the reverse of elimination (see Chapter 5) which can be used to prepare alkenes.
Is hydration syn or anti?
Acid-Catalyzed Hydration (syn + anti addition) Since this mechanism is carbocation-based we expect our H 2O nucleophile to attack the planar sp 2 carbocation from the top and bottom face with equal probability, which results in equal syn + anti addition.
What is an anti addition?
Anti addition: An addition reaction in which two substituents are added to opposite sides (or faces) of a double bond or triple bond. Electrophilic addition of Br2 to 1,2-dimethylcyclohexene is an anti addition reaction, resulting in trans-1,2-dibromocyclohexane. Related terms: Syn addition. Wikipedia entry.