Determining R and S Configurations of Newman Projections How To Determine R and S Configurations On Newman Projections? Fun Review: Newman Projections Of Cats Eclipsed and Staggered Conformations Converting a Newman Projection To A Line Diagram Determining R and S On Newman … [Read more...]

## Assigning Cahn-Ingold-Prelog (CIP) Priorities (2) – The Method of Dots

Cahn Ingold Prelog Priorities (2): Determining R/S On Rings, Chains, And More This post was co-authored with Matt Pierce of Organic Chemistry Solutions. Ask Matt about scheduling an online tutoring session here. In our first post on the Cahn-Ingold-Prelog (CIP) Rules, we gave a broad overview … [Read more...]

## Chiral Allenes And Chiral Axes

We've met alkenes before - right? Just in case you haven't, let's review the basics, because today's post is going to depend on understanding a few of the most important concepts. Alkenes contain both sigma [ σ] bonding formed through "head-on" orbital overlap [i.e. "single bonds"] and also pi [ … [Read more...]

## What’s a Racemic Mixture?

What do you notice about these three pictures? Count the number of left gloves and right gloves. 6 left and 6 right gloves, correct? What about this one: I count 8 right gloves, 4 left gloves. So there's a slight excess of right gloves here. Finally, this figure: ONLY right hand … [Read more...]

## On Cats, Part 6: Stereocenters

Let's recap what we've talked about so far. Sawhorse cat and Freaky Sawhorse cat are constitutional isocats. But Freaky Sawhorse Cat has a mirror image of himself crawling around somewhere - a cat that is not exactly the same, but in fact a non-superimposable mirror image. An enantiocat, in other … [Read more...]