Give the IUPAC name for each compound, including any R,S designation.

Name: Problem 42, Chapter 7: Organic Chemistry
Uploaded: 2019-04-13T23:31:29-08:00
Duration: 4 min 54 s
Channel: Catherine Smith
Description: Give the IUPAC name for each compound, including any R,S designation.

Give the IUPAC name for each compound, including any R,S...

Key Concepts

IUPAC Nomenclature

IUPAC nomenclature is a systematic method for naming chemical compounds as established by the International Union of Pure and Applied Chemistry. This standardized approach allows chemists to construct clear and unambiguous names for molecules, detailing aspects such as the type and arrangement of atoms, functional groups, and substituents within the structure.

Chirality and Stereochemistry

Chirality and stereochemistry involve the three-dimensional arrangement of atoms in molecules, which can lead to stereoisomers—molecules that have the same connectivity but differ in spatial orientation. A key aspect is the determination of absolute configuration at chiral centers using descriptors like R and S, which are assigned based on the Cahn-Ingold-Prelog priority rules.

Transcript

00:01 In this problem, we need to give the iupac name for this molecule, including stereochimistry in the name.

00:06 So the first thing you need to do is establish your root, which is the longest chain of carbons that you have.

00:11 And the root for this one is heptane, because we have our longest continuous carbon chain is seven carbon.

00:18 I'm just going to label those real quick, so we don't get them messed up.

00:28 At the two position, we have a bromo group.

00:34 And at the five position, we have an ethyl group.

00:38 So now we need to figure out the stereosific configuration for this bromine.

00:46 So you need to start by assigning con angle prelog priorities.

00:52 So the highest priority group is going to be bromine because it has the highest atomic number.

00:56 The second highest priority group is going to be the larger alpha group because it's attached to more carbons.

01:03 The third is going to be this methyl group over here.

01:07 And the lowest priority group is always going to be hydrogen if there's a hydrogen attached.

01:10 So the next thing you want to do is you want to count from 1 to 2 to 3.

01:15 And if it's going clockwise, it's going to be an r configuration.

01:19 If it's going counterclockwise, it's going to be an s configuration.

01:23 So the hydrogen was already pointed away from us, which is what we need.

01:26 You need the lowest priority group pointed away from you.

01:29 So going from 1 to 2 to 3, it's clockwise.

01:33 So it's going to be our iupac name is going to be 2r, bromo, 5, ethel, peptine.

01:57 It gets a little bit more difficult.

02:00 So our molecule this time involves two stereocenters.

02:14 Okay, so our root for this one is going to be cyclocintane...

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