Diels Alder Paper

1290 words, 6 pages

Intro Sample...


The ketones also develop a partial positive charge at the carbonyl carbon, thus helping them to be more effective heterodienophiles (Figure 1). For the first time, it was proven experimentally that a simple ketone could be a starting material for a hetero-Diels-Alder reaction. Huang and Rawal studied hetero-Diels-Alder reactions between various simple ketones and 1-amino-3-siloxybuadiene in polar protic and polar aprotic solvents. After the completion of the hetero-Diels-Alder reaction and successive elimination of the amino group with acetyl chloride, they concluded that the product yield was the highest when a polar protic solvent containing a non-shielded alcohol group was utilized. 2-butanol was found to be the most efficient solvent for this reaction (1).
Figure 1. A simple ketone hydrogen bonded to the polar protic solvent. The carbonyl carbon develops a partial positive charge, thus helping it to be a more effective heterodienophile. The resulting hetero-Diels-Alder reaction is shown which is more effective than a ketone that does not participate in hydrogen bonding.

[pic] [pic]

Several mechanisms could be proposed for this reaction, and two are shown. The first is that of the concerted hetero-Diels-Alder reaction. The concerted mechanism involves the diene and the heterodienophile reacting together in one step to form a product. The amino group on the cyclic product is then protonated by the acetyl chloride. The acetyl chloride then removes the TBS group, thus causing the carbonyl to form and the electrons in the double bond to move to the next carbons, thus pushing out the amine as a leaving group (Figure 2).

Figure 2. The concerted hetero-Diels-Alder mechanism.

[pic]

A second possible mechanism would be a step-wise hetero-Diels-Alder mechanism. The diene first attacks the carbonyl carbon, forming a carbocation intermediate. The oxyge View More »

Read More

Related Essays on Diels Alder Paper

  • Genertal Environment For Weyerhaeuser

    1261 words, 6 pages

    The General Environment surrounding the timber industry and Weyerhaeuser is highly reliant upon six different segments. These segments are: demographics, economics, political/legal, sociocultural, technological and global. The environment within which a company operates is directly influenced by what is going on in each segment. Weyerhaeuser must constantly analyze the surrounding environment through scanning, monitoring, forecasting and assessing, to determine the environments changes and its subsequent effect on the company. Over the past decades the timber industry has had minimal demogra

    View Document »

    Reflection 5: Your Last Writing Project

    609 words, 3 pages

    The last major writing project I did was an art appreciation paper as my final exam for my senior year of AP Literature and Composition in high school. Just as the project is called, the purpose of the paper is to appreciate an art form that most people typically would not appreciate. My art form was calligraphy with a focus on Eastern calligraphy. The goal of the paper was to convince the rest of the class to appreciate the art form through our paper and presentation. Most of my beginning rough drafts were made with pencil and paper but eventually transferred to my laptop as a more solid vers

    View Document »

    Recycling

    2021 words, 9 pages

    Just about everyone knows our environment is in danger. One of the most serious threats is the massive amount of waste we put into the air, water, and ground every year. All across the world are thousands of places that have been, and continue to be, polluted by toxic waste, radioactive waste and just plain garbage. It is imperative that we are aware of all the things that we can do to help our environment by diminishing the amount of trash and garbage that we produce each year. One easy way of doing that is by a method called recycling. Many might not know the importance of recycling and what

    View Document »

    Harrison Keyes

    2268 words, 10 pages

    Running head: GAP ANALYSIS: HARRISON-KEYES Gap Analysis: Harrison-Keyes Curtney Vaughn University of Phoenix Gap Analysis: Harrison-Keyes Harrison-Keyes is a global publisher of print products. The company holds about 22,700 active titles and publishes about 2000 new titles each year. Throughout the years the company’s focus shifted to meet demand. Because of this the company was regarded as a leading publisher of business, scientific and technical information. The company has been faced with several setbacks due to many mishaps, miscommunication, and lack of conducting researc

    View Document »

    Anymonos

    465 words, 2 pages

    Mechanical pulping There are two major mechanical pulps, thermo mechanical pulp (TMP) and groundwood pulp (GW). In the TMP process, wood is chipped and then fed into large steam-heated refiners where the chips are squeezed and fibreized between two steel discs. In the groundwood process, debarked logs are fed into grinders where they are pressed against rotating stones and fibreized. Mechanical pulping does not remove the lignin, so the yield is very high, >95%, but also causes paper made from this pulp to yellow and become brittle over time. Mechanical pulps have rather short fibre lengths a

    View Document »

    Blog Post

    287 words, 2 pages

    The research paper, the three words almost every college student absolutely hates hearing. When those words are in that exact order it scares people and drives chills down their spines. The reason why the research paper has earned the ‘cringe worthy’ award is probably because it is a daunting task to perform. When people hear research paper they picture what that looks like in their heads. Typically, people imagine that they must pick a thesis that could be backed up by five or six different credible sources. Which is a correct way to write a paper, but it is not the only way to write a paper.

    View Document »

    Anuj

    14522 words, 59 pages

    Background Paper submitted to the Committee on India: Vision 2020 Telecom Sector in India: Vision 2020 Manas Bhattacharya*, IES (Deputy Director General (Finance), Department of Telecommunications, Ministry of Communications & IT, Government of India) The views exposed in this paper are that of the authors not of the Planning Commission Telecom Sector in India: Vision 2020 by Manas Bhattacharya*, IES (Deputy Director General (Finance), Department of Telecommunications, Ministry of Communications & IT, Government of India) Introduction The purpose of this paper is t

    View Document »

    Positivism Debate

    7190 words, 29 pages

    The current issue and full text archive of this journal is available at www.emeraldinsight.com/0955-534X.htm The collaborative strategy in the Taiwan shoe industry Tzong-Ru ( Jiun-Shen) Lee and Toong-Chinn Venice Koh Department of Marketing, National Chung Hsing University, Taichung, Taiwan Abstract Purpose – The purpose of this paper is to elaborate the reason behind a sustainable guanxi network through the introduction of the collaborative strategy in the Taiwanese shoe industry. Design/methodology/approach – Literature review in the area of Chinese business culture, and guanxi networ

    View Document »

    Whitle Bread

    581 words, 3 pages

    Running head: PROJECT PLAN FOR WHITBREAD WORLD SAILBOAT RACE Project Plan for Whitbread World Sailboat Race Your Name Goes Here University of Phoenix Project Plan for Whitbread World Sailboat Race [The introduction goes here. It should be one or two paragraphs explaining the findings of your paper. The introduction should prepare the reader for the contents of the paper by previewing the four main topics in your paper. Be sure to end with a transition word or sentence to lead into Section 1 of your paper. Triple click anywhere in this paragraph to begin typing your own introductio

    View Document »

    Ford Motor Company

    4528 words, 19 pages

    Ford Motor Company: An Analysis of Employee Motivation and Morale Table of Contents Overview 2 Introduction 3 Clues from History 3 Ford & the Other Guys 6 Innovation & Motivation 8 The Family 12 Cutbacks 13 Conclusion 15 Works Cited 16 Overview The purpose of the following paper is to inform the reader about possible techniques of behavior modification in an attempt to solve motivational problems with workers at Ford Motor Company. Information on the company’s history, current and future outlooks, and human resource problems will lay the foundation to apply prov

    View Document »

More Popular Essays

Research help is just moments away!