Organic Chemistry II - The Diels-Alder reaction, Syn Dihydroxylation and Oxidative Cleavage

Dericyclic Reaction

A concerted reaction in which all of the electron involves in bond breaking and bond formation are delocalized in a ring in the transition state

Cycloaddition reaction

A concerted reaction in two separate species come together produce new ring

Diene

Compound wiht pair conjugated pi bonds contribute four pi electorn in Diels Alder reaction

Dienophile

compound contributes single pi bond in Diels Alder reaction

4+2 Cycloaddition

Specific type of cycloaddition reaction in which four electron are supplied by one specier and two electron are supplied by other species

Thermally allowed

Describes a reaciton that takes place readily when the reactants are in their ground state electorn configuration

2+2 cycloaddition

Specific type of cycloaddition reaction in which two electron are supplied by each species

Thermally forbidden

reaction that does not take place readily when the reaction are in their ground state electron configuration

S-cis conformation

A rotational conformation in which substituents are on the same side single bond

S-trans conformation

rotational conformation in which substitutents are on opposite sides of single bond

Endo approach

the orientation of the dienophile in which the substituents on the dienophile point toward diene

Exo Approach

The orientation of dienophile in which sub on dienophile point away from diene

4+2 cycloelimination

Concerted reaction a cyclic molecule cleaved into two separate species, and recieves four electron other two electrons

Photochemically allowed

reaction placed at reasonable rate when irriated wiht UV light

Photochemically forbidden

reaction that does not take place readily when one or more reactant have excited electron configuration

Syn dihydroxylation

a reaction in which two OH groups add across a C=C or C triple bond in syn fashion

Omate ester

compound bonding arrangement Ro-Os=O A cyclic omate ester is an intermediate in the oxidation of an alkene with OsO4

Oxidative Cleavage

Oxidation reaction results in severing of C=C bonds or C triple bonds into separate carbonyl containing functional groups

Periodate Anion

IO4 used as reagent in oxidative cleave of 1,2 dioles to produce aldehydes and ketones

Periodic Acid

The reagent HIO4 used to introduce periodate anion in oxidative cleave 1,2 diols

Peridate ester

Characterized by bonding arrangement RO-I=O

Ozonlysis reaction

Reaction in which ozone react with alkene to cleave C=C bond