How would you carry out the following syntheses? (FIGURE CANNOT COPY)

Name: Problem 34, Chapter 10: Organic Chemistry
Uploaded: 2020-06-29T03:28:04-08:00
Duration: 3 min 36 s
Channel: Tom Rutherford
Description: How would you carry out the following syntheses? (FIGURE CANNOT COPY)

How would you carry out the following syntheses? (FIGURE...

Key Concepts

Retrosynthetic Analysis

Retrosynthetic analysis is the process of deconstructing a target molecule into simpler precursor structures. This technique helps in planning a synthetic route by identifying strategic bond disconnections and guiding the selection of starting materials and reactions to assemble the target compound from more basic building blocks.

Functional Group Interconversion (FGI)

Functional group interconversion involves transforming one functional group into another to facilitate subsequent reactions. This is crucial in synthesis because it allows chemists to manipulate molecules into forms that are more reactive or compatible with the desired reaction conditions, enabling the progression of multi-step synthetic sequences.

Reaction Mechanism

Understanding reaction mechanisms is key in synthesis, as it involves knowing the detailed step-by-step process by which reactants convert into products. By grasping the mechanism, chemists can predict the outcome of reactions, optimize conditions, and troubleshoot issues related to yield or selectivity.

Regioselectivity and Stereoselectivity

Regioselectivity and stereoselectivity are concepts that refer to the control over where and how new bonds are formed in a molecule. Regioselectivity concerns which position on a molecule is modified during a reaction, while stereoselectivity involves the spatial orientation of the resulting substituents, both of which are essential for the synthesis of complex and chiral molecules.

Reagent and Condition Selection

Choosing the appropriate reagents and reaction conditions is fundamental in executing a synthesis successfully. This involves considering factors such as reactivity, compatibility with other functional groups, and the potential formation of side products, ensuring that the reaction proceeds with high yield and selectivity.

Protecting Groups

Protecting groups are used to temporarily mask reactive functional groups during multi-step syntheses. Their use prevents unwanted side reactions and allows for selective transformations at other sites on the molecule, being a key strategy when working with multifunctional compounds.

Transcript

00:01 Okay, this problem is asking us how do we carry out the following reactions? we're first given a cyclohexane, and we want to transform it into a cyclohexane with four carbons attached to it.

00:14 Okay, so first thing we notice is we have an alkan.

00:19 Cycloalkanes are generally unreactive.

00:21 The best way to make them more reactive is to react it with radical bromination or radical coronation.

00:26 So i will use br2 and hv.

00:30 Hv is light.

00:32 Essentially, that will add a bromine to my cycloalkane.

00:36 So, bromine.

00:38 Okay, and now i want to look back at my ending product, and i see that i have to add four carbons.

00:44 Adding four carbons, i immediately think of greenards.

00:48 Greenards help to add carbons to electrophilic compounds.

00:51 So i want to make a greenard from what i have right now.

00:54 So i'm going to use m .g and a thf solvent, ether solvent.

01:02 Okay, and that will make my green yard.

01:05 So, m -g -b -r.

01:08 Okay, and last bit of least, we created my nucleophilic compound, my greenyard, and now i want to react it with an electrophilic compound to add four carbons.

01:17 So, in order to add four carbons, i need to have a butane, for example, one, two, three, four carbons, and attached to the fourth carbon, i should have a leaving group, such as iodine.

01:29 This will occur via an s -n -2 reaction, and i should have my, desired product.

01:35 Okay, so that is one of them...

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