OMG. You are my new favorie

Subscribed already. Thank you so much

Thank you sir.. Tomorrow is my che. Mid term exam 😂😂

Hi Joe , just a quick question : you said in a previous video that when using the Double Switch , the assignment before the switch had to be conserved (R -> S -> R) - during the second stereoisomer example , the second stereo center in the the left molecule was an S configuration before making the Double Switch , but it comes out R ? I’m just confused on how that happened , thanks and I love the videos

Hi Joe! Love your videos! Quick questions - is the point of the double switch to conclude that a hydrogen on the same plane always results in the same R/S configuration as a hydrogen on a dash?

@jOeCHEM

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Thanks for watching and being a jOeCHEMist! To answer your question, the point of the double switch is to make assigning R/S easier. The convention for assigning R/S REQUIRES that the lowest priority group (aka the "lightest" group in terms of molecular weight) be facing away from you, which is a dash (when we draw molecules on paper). If a hydrogen (or whatever your lowest priority group may be) is on a straight line, it can be a bit hard to visualize the perspective necessary to view the molecule with that lowest priority group facing away from you. As a result, the double switch gives us an easy, procedural way to rearrange groups around a stereocenter, without changing the configuration & saving us from having to visualize the molecule from a certain vantage point, so that we can put the lowest priority group as a dash & assign R/S straight up. Let me know if that made sense, and I apologize if that was what you were asking and that explanation was overkill.