DAT Booster Test IV (Organic Chemistry)

What does the reagent PBr3 do?

It replaces an OH with a Br

Bromination of isopropyl occurs via what type of intermediate?

A radical intermediate

What is the difference between anomers and epimers?

Anomers are a specific type of epimer because they differ in configuration at one SPECIFIC carbon called the anomeric carbon

D-Glucose and D-Mannose are examples of...

Epimers

In a boat conformation, which positions do substituents prefer to occupy?

Equatorial positions (like chair conformations)

When will the E2 mechanism operate contrary to Zaitsev's rule and form the least substituted alkene?

If that is the only anti-coplanar hydrogen from the leaving group

Dieckmann condensation

Intramolecular claisen condensation Reaction of a diester with a base to give a B-ketoester

Epimers

Stereoisomers that differ in configuration at only ONE stereocenter

What is the major requirement of E2 reactions?

The H and the leaving group (halogen) MUST be in an anti-coplanar position (180 degrees apart in the Newman projection)