X

Download Alcohols PowerPoint Presentation

SlidesFinder-Advertising-Design.jpg

Login   OR  Register
X


Iframe embed code :



Presentation url :

Home / Health & Wellness / Health & Wellness Presentations / Alcohols PowerPoint Presentation

Alcohols PowerPoint Presentation

Ppt Presentation Embed Code   Zoom Ppt Presentation

PowerPoint is the world's most popular presentation software which can let you create professional Alcohols powerpoint presentation easily and in no time. This helps you give your presentation on Alcohols in a conference, a school lecture, a business proposal, in a webinar and business and professional representations.

The uploader spent his/her valuable time to create this Alcohols powerpoint presentation slides, to share his/her useful content with the world. This ppt presentation uploaded by worldwideweb in Health & Wellness ppt presentation category is available for free download,and can be used according to your industries like finance, marketing, education, health and many more.

About This Presentation

Slide 1 - Alcohols
Slide 2 - Hydrogen Bonding Three ethanol molecules.
Slide 3 - Hydrogen Bonding & boiling point Increases boiling point, higher temperature needed to separate the molecules. Hexane 69 deg. 1-pentanol 138 1,4-butanediol 230 Ethanol 78 deg Dimethyl ether 24
Slide 4 - Earlier Discussion of Acidity Methanol Ethanol 2-Propanol 2-Methyl-2-propanol RO-H  RO – (solvated) + H + (solvated) Increasing Acidity of the alcohol Recall: H2O + Na Na+ + OH- + ½ H2(g) Alcohols behave similarly ROH + Na Na+ + OR- + ½ H2(g) Alkoxide, strong base, strong nucleophile (unless sterically hindered) Also: ROH + NaH Na+ + OR- + ½ H2(g) Increasing Basicity of Alkoxide Anion, the conjugate base Alkoxide ion, base Alkoxides can be produced in several ways…
Slide 5 - -OH as a Leaving Group R-OH + H +  R-OH2+ Protonation of the alcohol sets-up a good leaving group, water. Poor leaving group, hydroxide ion. Another way to turn the –OH into a leaving group…
Slide 6 - Conversion to Alkyl Halide, HX + ROH  RX + H2O When a carbocation can be formed (Tertiary, Secondary alcohols) beware of rearangement. SN1 Expect both configurations. When a carbocation cannot be formed. Methanol, primary. SN2
Slide 7 - But sometimes experiment does not agree with our ideas… Observed reaction The problem: Rearrangement of carbon skeleton which usually indicates carbocations. Reacting alcohol is primary; do not expect carbocation. Time to adjust our thinking a bit…. Not a primary carbocation
Slide 8 - Other ways to convert: ROH  RX We have used acid to convert OH into a good leaving group There are other ways to accomplish the conversion to the halide. Leaving group. Leaving group. Next, a very useful alternative to halide…
Slide 9 - An alternative to making the halide: ROH  ROTs p-toluenesulfonyl chloride Tosyl chloride TsCl Tosylate group, -OTs, good leaving group, including the oxygen. The configuration of the R group is unchanged. Preparation from alcohols.
Slide 10 - Example Preparation of tosylate. Retention of configuration
Slide 11 - Substitution on a tosylate The –OTs group is an excellent leaving group
Slide 12 - Acid Catalyzed Dehydration of an Alcohol, discussed earlier as reverse of hydration Protonation, establishing of good leaving group. Elimination of water to yield carbocation in rate determining step. Expect tertiary faster than secondary. Rearrangements can occur. Elimination of H+ from carbocation to yield alkene. Zaitsev Rule followed. Secondary and tertiary alcohols, carbocations
Slide 13 - Primary alcohols Problem: primary carbocations are not observed. Need a modified, non-carbocation mechanism. Recall these concepts: Nucleophilic substitution on tertiary halides invokes the carbocation but nucleophilic substitution on primary RX avoids the carbocation by requiring the nucleophile to become involved immediately. The E2 reaction requires the strong base to become involved immediately. Note that secondary and tertiary protonated alcohols eliminate the water to yield a carbocation because the carbocation is relatively stable. The carbocation then undergoes a second step: removal of the H+. The primary carbocation is too unstable for our liking so we combine the departure of the water with the removal of the H+. What would the mechanism be???
Slide 14 - Here is the mechanism for acid catalyzed dehydration of Primary alcohols 1. protonation 2. The carbocation is avoided by removing the H at the same time as H2O departs (like E2). As before, rearrangements can be done while avoiding the primary carbocation.
Slide 15 - Principle of Microscopic Reversibility Same mechanism in either direction.
Slide 16 - Pinacol Rearrangement: an example of stabilization of a carbocation by an adjacent lone pair. Overall:
Slide 17 - Mechanism Reversible protonation. Elimination of water to yield tertiary carbocation. 1,2 rearrangement to yield resonance stabilized cation. Deprotonation. This is a protonated ketone!
Slide 18 - Oxidation Primary alcohol RCH2OH RCH=O RCO2H Na2Cr2O7 Na2Cr2O7 Na2Cr2O7 (orange)  Cr3+ (green) Actual reagent is H2CrO4, chromic acid. Secondary R2CHOH R2C=O Tertiary R3COH NR KMnO4 (basic) can also be used. MnO2 is produced. The failure of an attempted oxidation (no color change) is evidence for a tertiary alcohol. Na2Cr2O7
Slide 19 - Example…
Slide 20 - Oxidation using PCC Primary alcohol RCH2OH RCH=O PCC PCC Secondary R2CHOH R2C=O Stops here, is not oxidized to carboxylic acid
Slide 21 - Periodic Acid Oxidation
Slide 22 - Mechanistic Notes Cyclic structure is formed during the reaction. Evidence of cyclic intermediate.
Slide 23 - Sulfur Analogs, Thiols Preparation RI + HS-  RSH SN2 reaction. Best for primary, ok secondary, not tertiary (E2 instead) Acidity H2S pKa = 7.0 RSH pKa = 8.5 Oxidation
 

Frequently Asked Questions

> About SlidesFinder?

Slidesfinder is a website that allows users to upload and share their PowerPoint presentations online. It provides a platform for individuals and businesses to share their ideas and knowledge through presentations, and for others to view and download these presentations for educational or professional purposes.
Slidesfinder offers a wide range of presentation topics and categories, including business, education, science, technology, health, and more. Users can also search for presentations using keywords, tags, or by category. The website provides tools to create professional presentations with rich media, animations, and graphics.



One of the key features of Slidesfinder is its user-friendly interface, which allows users to easily upload, view, and share presentations. Users can also embed their presentations in their websites or blogs using the website's embed code feature.
Slidesfinder also offers premium services, such as the ability to create private presentations and to download presentations in high-quality formats. However, the basic features of Slidesfinder are free to use, making it accessible to anyone who wants to share their ideas and knowledge through presentations.

> How do I register with SlidesFinder?

Go to registration page (you can see signup link on top of website page) https://www.slidesfinder.com/signup . If you have facebook/gmail account them just click on SIGN IN WITH FACEBOOK OR SIGN IN WITH GOOGLE button, by this you will be a registered member of slidesfinder without filling any form, required detail automatically will be fatch from your account. If you do not a Facebook account, then click on "Signup". Fill all required fields and you will be a registered member of slidesfinder.

> Is slidesfinder account confirmation is mandatory?

Yes it is mandetory to active your account to login.

> Do I need to signup/login on SlidesFinder before uploading a PowerPoint presentation?

Yes, you need to login with your account before uploading presentation. Your username will be displayed on your uploaded presentation. Your registered email id is needed for sending your stats of uploaded presentation.

Slidesfinder is a sharing website for PowerPoint presentations search and share. Find your interest in the form of powerpoint presentations on slidesfinder and save your valuable time . On Slidesfinder you get presentations from our huge library of professional ppt presentations. We believe in making your search INFORMATIVE and FUN. Find your best ppt presentation from a pool of PowerPoint presentations stacked under important industry categories like business & management, heath & Wellness,eduction & training etc. We provide unique informative PowerPoint presentation for marketers, presenters and educationists. These professional PowerPoint presentations are uploaded by professionals from across numerous industry segments.These ppt presentations are available for FREE download.

Not just finding your interest, but facilitate you broadcast your interest. We have created this platform for easy sharing of PowerPoint presentations, ensuring that these presentations get maximum exposure. Create your slidesfinder account and upload PowerPoint presentations for free, share on social media platforms and BUILD YOUR CROWD WITH PRESENTATION !!

The Great Buddha says, "Share your knowledge.It’s a way to achieve immortality"! So, start sharing knowledge and we are here to make that immortal !!

© 2013-2024 SlidesFinder. All rights reserved.

Re-productivity of content are not allowed. Without prior written permission from author, commercial use of any content is illegal.