Uploaded April 2026 | Updated September 2026, 1 week ago

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Can't visualize 3D molecules from 2D lines? Moving from a skeletal structure (line structure) to a perspective formula (wedge-and-dash structure) is the first major hurdle in organic chemistry. If you can't "see" the 3D arrangement, assigning R/S configuration becomes a total guessing game later.

In this video, I'm going to give you "3D X-ray vision." Using molecular models, we will convert skeletal structures into perspective formulas step-by-step.

I have graded thousands of organic chemistry exams, and I see students lose easy point on these conversions every single year. I'll show you exactly how to avoid the R/S flip and the alkyne angle trap.

What we cover:
• The bare bones of a skeletal structure: What those lines actually mean
• Wedges vs Dashes: How to show what's coming at you and what's going away
• 2,3-Dibromobutane Walkthrough: A standard zig-zag backbone conversion
• 4-Bromo-2-pentyne Challenge: Why triple bonds (alkynes) trick even the best students

Related Units:
Are you studying chirality and stereochemistry? Here's my full unit: youtube.com/playlist?list=PLvUW25kBaMMupOdw1Wgy8YauiQ40J_5nx
Working on organic chemistry reaction mechanisms? This is what you want: youtube.com/playlist?list=PLvUW25kBaMMtvqt_IBtezyBX_kk447pxZ

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0:00 The "Bare Bones" of Skeletal Structures
1:15 Visualizing 2,3-Dibromobutane in 3D
1:37 What are Perspective Formulas? (Wedges & Dashes)
1:59 Step 1: Drawing the Carbon Backbone
2:18 Step 2: Placing Substituents (Br)
2:29 Step 3: Adding Implicit Hydrogens
3:28 Exam Trap 1: The R/S Flip
5:42 Exam Trap 2: The 180° Alkyne Trap
5:50 Modeling 4-Bromo-2-pentyne
7:40 Perspective to Skeletal Conversion is Different

Citations:
Paula Yurkanis Bruice, "Organic Chemistry" 8th ed
openstax.org/details/books/organic-chemistry
openstax.org/details/books/chemistry-2e

Music: youtu.be/lL6AsbG07xY