Ethers and Sulfides


Illustration representing dimethyl ether geometry on the left and dimethyl sulfide geometry on the right

Module Overview

This module covers synthesis and reactivity of ethers and epoxides.  Students will connect these to the larger sustainability goals of UNSDG 3: Good Health and Well-being, 9: Industry, Innovation, and Infrastructure, 12: Responsible Consumption and Production, and 13: Climate Action. This module is designed to be taught in consecutive class periods of one week in the later part of Organic I term or the early part of Organic 2 term.

Module Goal

The goal of this module is to understand the chemical properties, uses, sources, safety, and environmental considerations surrounding the use of ethers. Students will learn newer alternative and complementary syntheses of and with ethers, including some as biofeedstocks. Through the lens of ethers, students will be able to choose safer and effective solvents. Students will be able to characterize ethers by comparisons with related functional groups (structure-vs.-property/reactivity): alcohols, dialkyl sulfides, amines, and epoxides.

Audience

First-semester or early second-semester organic chemistry undergraduates

Class Time Requirement

Approximately three 50-minute class periods

Module Authors

Jamie L. Ferguson, Emory & Henry College; Felicia A. Etzkorn, Virginia Tech; Maggie B. Bump, Virginia Tech

Module Summary

Assumed Prior Knowledge

This module is designed to be used in the first semester of organic chemistry. Students should be able to demonstrate the following skills and concepts to successfully begin this module:

  • The fundamental mechanisms of nucleophilic substitution ( SN1, SN2) on sp3 carbons and elimination (E1/E2) mechanisms.  
  • Knowledge of spectroscopy is NOT required. 

Learning Objectives

Students will be able to:

  1. Understand the chemical properties, uses, sources, safety, and environmental considerations surrounding the use of ethers. 
  2. Through the lens of ethers, students will be able to choose safer and effective solvents.
  3. Become familiarized with newer alternative and complementary syntheses and reactions of ethers, sulfides, and epoxides.
  4. Characterize ethers by comparisons with related functional groups (structure-vs.-property/reactivity): alcohols, sulfides, amines, and epoxides.

Unit Overview

 

Unit 1: Structure, Properties, Safety, and Sources

1.1

(5 min) Nomenclature and structure
(5 min) Physical properties and chemical reactivity 
(5 min) Pre-class activity in-class discussion: acid-base reactions of diethyl ether 
(15 min) Safety concerns of ether solvents  
(3 min) Hemiacetals and acetal: hydrolysable ethers 
(5 min) Synthesis of tetrahydrofuran (THF) and 2-methylTHF (MeTHF) from biofeedstocks 
(2 min) Ethereal bio-oils derived from lignin 
Unit 1 Homework pp. 14 

 

Unit 2: Synthesis of Ethers and Sulfides

2.1

(25 min) Synthesis of ethers – Acidic, basic, and electrochemical
(10 min)S-Adenosylmethionine: a biochemical sulfide 
Pre-class activity: S-adenosylmethionine synthesis
Unit 2 Homework pp. 21 

 

Unit 3: Physical Properties and Applications in Fuel Chemistry

3.1

(5 min) Ethylene oxide (EtO) structure
(15 min) Epoxides: synthesis, uses, toxicity, and hazards
(20 min) Reactions of epoxides: basic and acidic selectivity
(5 min) Benzene epoxidation and carcinogenicity 
(10 min) Epoxide ring-opening polymerizations (ROP) 
(10 min) Synthetic efficiency
Unit 3 Homework pp. 29 

 

Download Module

Ethers and Sulfides Includes:

  • Module Overview Document
  • Units 1-3
  • Formative Assessments
  • Summative Assessments

 

UN SDGs

This module references the following UN Sustainable Development Goals (SDGs):



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