Determine the mechanism and draw the products of each reaction. Include the stereochemistry at a

Determine the mechanism and draw the products of each...

Key Concepts

Product Prediction

This concept involves using the understanding of reaction mechanisms and stereochemical principles to predict the structure and stereochemistry of reaction products. It includes recognizing regiochemistry and stereoselectivity, ensuring that each stereogenic center is correctly assigned in the final product.

Curved Arrow Mechanism Diagrams

This is a graphical representation used to illustrate the movement of electrons during a chemical reaction. Curved arrows indicate the flow of electron pairs and are essential for tracing the transformation from reactants to products, helping to visualize key intermediates and transition states in the mechanism.

Reaction Mechanisms

This concept involves understanding the step-by-step sequence of elementary reactions that lead to the formation of products from reactants. In organic chemistry, mechanisms explain how bonds break and form via intermediates and transition states, providing a detailed pathway of electron movement that can be depicted using curved arrows.

Stereochemistry

Stereochemistry focuses on the three-dimensional arrangement of atoms within a molecule and how this arrangement affects the molecule's chemical behavior and reactivity. It encompasses the study of spatial configurations of molecules, considering factors such as chirality, diastereomers, and enantiomers.

Stereogenic Centers

Stereogenic centers are atoms, typically carbon, that are attached to four different substituents, rendering the center chiral. The configuration at these centers determines the molecule's overall stereochemistry, which is crucial when predicting reaction outcomes and establishing the correct spatial arrangement in the reaction products.

Transcript

00:01 In this problem, you need to show how these two reagents react and decide whether it's an s -n -1 mechanism or an s -n -2 mechanism.

00:09 In the products, you have to show specific stereochemistry if it exists.

00:13 So the first step we need to take is to identify what kind of halide it is.

00:19 So this is a primary halide, meaning that it's only going to react by an s -n -2 mechanism.

00:24 This is also a strong nucleophile, but since its primary alkylide, it's going to react.

00:30 By an s &2 anyway.

00:33 So it attacks in a concerted step, attacking the carbon and kicking out the leaving group in the same step.

00:39 And our product is this.

00:45 If this were a stereo center, it would invert the stereo chemistry, but it's not, so we don't have to worry about that in part a.

00:54 In part b, our reagents are that in the a's ion.

01:14 So once again, you identify what kind of alphalate it is.

01:18 And this is secondary so it can do s in one or s and two so then you look at the nucleophile and it's a strong nucleophile so instead of favoring s in one it favors s and two so once again it attacks in a concerted concerted fashion attacking and kicking out the leaving group in the same step and s and two reactions invert the stereo chemistry where it was attacked so you get this product and just make sure to pay attention to the stereocchemistry there.

01:58 And c, our reagents are this and this.

02:16 So once again you identify what kind of aqua halide it is.

02:18 This one is tertiary, so it can only react via an s in one mechanism...

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