Organic Chemistry: NMR Spectroscopy, Nomenclature, and Reactions of Alcohols, Ethers, Epoxides, and Organometallics

Vocabulary flashcards covering 1H and 13C NMR spectroscopy concepts, IUPAC rules for naming alcohols, amines, and ethers, and key synthetic reactions involving substitution, elimination, oxidation, ring-opening, and organometallic reagents.

IUPAC Alcohol Nomenclature

The systematic naming method for alcohols where the parent alkane name suffix "-e" is replaced with "-ol", and the carbon chain is numbered to give the carbon bearing the $\text{-OH}$ group the lowest possible number.

Primary ($1^\circ$) Alcohol

An alcohol in which the hydroxyl-bearing carbon atom is directly attached to only one other carbon atom.

Secondary ($2^\circ$) Alcohol

An alcohol in which the hydroxyl-bearing carbon atom is directly attached to two other carbon atoms.

Tertiary ($3^\circ$) Alcohol

An alcohol in which the hydroxyl-bearing carbon atom is directly attached to three other carbon atoms.

IUPAC Amine Nomenclature

The systematic naming method for amines where the parent alkane suffix "-e" is replaced with "-amine", and substituents bonded directly to the nitrogen atom receive the prefix "$N-$".

Alkoxy Group

An alkyl group attached to an oxygen atom ($\text{R-O-}$), designated as a substituent prefix (e.g., methoxy, ethoxy) when naming ethers attached to a longer carbon chain.

Hydroxy Group

The name given to the $\text{-OH}$ functional group when it acts as a substituent on a molecule containing a higher-priority functional group.

Amino Group

The name given to the $\text{-NH}_2$ (or substituted nitrogen) functional group when designated as a substituent on a parent molecule containing a higher-priority functional group.

Alcohol Substitution with Mineral Acids

A reaction in which an alcohol reacts with $\text{HCl}$, $\text{HBr}$, or $\text{HI}$ to protonate the poor leaving group ($\text{HO}^-$) into a good leaving group ($\text{H}_2\text{O}$), converting it into an alkyl halide via $S_N1$ (for $2^\circ$ and $3^\circ$) or $S_N2$ (for $1^\circ$).

Phosphorus Tribromide ($\text{PBr}_3$)

A reagent that converts primary and secondary alcohols into alkyl bromides exclusively via an $S_N2$ mechanism without undergoing carbocation rearrangements.

Thionyl Chloride ($\text{SOCl}_2$)

A reagent used with pyridine to convert primary and secondary alcohols into alkyl chlorides exclusively via an $S_N2$ mechanism without carbocation rearrangements.

Phosphorus Oxychloride ($\text{POCl}_3$)

A reagent used with pyridine under non-acidic/basic conditions to convert primary alcohols into terminal alkenes through an $E2$ elimination mechanism.

Chromic Acid ($\text{H}_2\text{CrO}_4$)

A strong oxidizing reagent formed in situ from $\text{CrO}_3$ or $\text{K}_2\text{Cr}_2\text{O}_7$ in $\text{H}_2\text{SO}_4$ that oxidizes primary alcohols to carboxylic acids and secondary alcohols to ketones.

Pyridinium Chlorochromate (PCC)

A mild oxidizing agent composed of a pyridinium cation and a chlorochromate anion ($\text{CrO}_3\text{Cl}^-$) that selectively oxidizes primary alcohols to aldehydes and secondary alcohols to ketones.

Ether Cleavage

A substitution reaction in which an unreactive ether reacts with strong halogen acids ($\text{HBr}$ or $\text{HI}$) via $S_N1$ or $S_N2$ pathways to yield an alcohol and an alkyl halide.

Epoxide

A highly reactive cyclic ether containing a three-membered ring with significant angle strain that undergoes ring-opening reactions upon nucleophilic attack.

Acidic Epoxide Ring Opening

An epoxide ring-opening reaction under acidic conditions where protonation precedes nucleophilic attack, causing the nucleophile to preferentially attack the more substituted carbon atom through a hybrid $S_N1/S_N2$ mechanism.

Basic Epoxide Ring Opening

An epoxide ring-opening reaction under basic conditions where a strong nucleophile attacks the less hindered carbon atom strictly through an $S_N2$ mechanism.

Organometallic Compound

A compound containing a direct carbon-metal bond, in which the carbon atom acts as a strong nucleophile and base due to the lower electronegativity of the metal (e.g., $\text{C}=2.5$ vs $\text{Mg}=1.2$).

Grignard Reagent

An organomagnesium halide ($\text{RMgX}$) that acts as a powerful carbon nucleophile and strong base, widely used for carbon-carbon bond formation.

Grignard Epoxide Reaction

A synthetic reaction where a Grignard reagent attacks the less hindered carbon of an epoxide under basic conditions, forming a new carbon-carbon bond and yielding an alcohol with the hydroxyl group located two carbons away from the new bond.