Hemiacetal PowerPoint PPT Presentations

Hemiacetal and Acetal Functional Groups Hemiacetal: alcohol and ether on same carbon Acetal: Two ethers on same carbon Mechanism Must be acid-catalyzed.

Now create Grignard and then react Grignard ... has 3d orbitals ... Milder oxidizing reagents can also be used Tollens Reagent test for aldehydes Drastic ...

Substitution an atom (group) of the molecule is replaced by ... aldehyde/ketone. Hemiacetals. Addition of alcohol to the carbonyl group yields hemiacetal: ...

Chapter 21 Aldehydes and Ketones Nucleophilic Addition Cyclic Hemiacetals In the conversion of hemiacetals to acetals, the overall result is the replacement of the ...

The difference between aldehyde and ketone was found to be: In aldehyde C=O attach with H and ... Benzoin condensation. b) Formation of hemiacetals and acetals ...

Organic Chemistry Aldehydes and Ketones Chapter 17 Formation of Acetals Hemiacetal reactions (formation of hemiacetals) likely when within the same molecule 1o ...

Aldehydes and ketones that contain an OH group elsewhere in the molecule can ... close ring by hemiacetal formation between OH at C-4 and carbonyl group. D-Erythrose ...

for acetal formation from ketones. Important exception: ... Second stage is hemiacetal-to-acetal conversion. involves carbocation chemistry ...

Carbohydrates Chapter 18 Cyclic forms of monosaccharides We saw back in chapter 15 that glucose can form a cyclic hemiacetal. In fact, this form of glucose is more ...

Trends in Cell Biology Trends in Biochemical Science ... (ketose) L-Glucose. L-Mannose. Alcohol. Aldehyde. Hemiacetal. Alcohol. Ketone. Hemiketal. D-Glucose ...

Accretion Reactions of Aldehydes and Ketones. Based on work of Jang and Kamens ... Accretion products for each aldehyde/ketone (hydrate, dimer, trimer, hemiacetal, ...

HO. OH. rotate C5 about C4 by 120o. form hemiacetals between. C5-OH and ... HO. CH2OH. OH. Fischer Projections of D-Glucopyranose Anomers. b-D-( )-Glucopyranose ...

18.10 and 18.11 - Cyclic Structures of Monosaccharides ... Used in cereals, candies, and brewing. A reducing sugar (has a hemiacetal) Lactose ...

Request for TOC report @ http://bit.ly/2yKXt6p Glucuronolactone are naturally occurring chemicals produced by liver from glucose and found in nearly all connecting tissues of human body. These are white odourless compounds having melting point range from 176-178° C and soluble in water. They exist in monocyclic aldehyde and bicyclic hemiacetal form. As glucuronides, they combine with toxic substances such as morphine and excrete them by converting into glucuronide conjugate. In addition, they can be derived from plant gums. The product is used in vitamin C synthesis and used for treatment of food poisoning, arthritis, hepatitis and hepatic cirrhosis. Government organizations such as Food and Drug Administration and European Food Safety Authority govern its intake and usage in energy drinks.

... ketones Methanal (formaldehyde) Ethanal (acetaldehyde) Propanal Pentanal Nomenclature of Aldehydes If the aldehyde group is attached to a ring, ...

Title: Slide 1 Author: Marlon Konzen Last modified by: Marlon Konzen Created Date: 2/16/2005 4:49:28 PM Document presentation format: Apresenta o na tela

Reactions of Aldehyde and Ketone. Chem 162 class work for Tue, May 24th. ... Addition Reactions Aldehydes and Ketones ... aldehydes and ketones. Addition of ...

CHEM 7784 Biochemistry Professor Bensley * FIGURE 7-11 Formation of maltose. A disaccharide is formed from two monosaccharides (here, two molecules of D-glucose) when ...

Mc. Murry, J. Qu mica Org nica. 6 Ed. Editorial Thomson, Mexico, 2004. Solomons, T. W. G. Qu mica Org nica. 2 Ed. Editorial Limusa, Mexico, 2000. Vollhardt ...

Aldehydes and ketones Chapter 15 Reactions of aldehydes and ketones with alcohols Acetals can be isolated and used in subsequent chemical reactions.

4.9 Oxidation and reduction of Aldehydes and ketones Tollens Test Add ammonia solution to AgNO3 solution until precipitate dissolves. Aldehyde reaction forms a silver ...

Chapter 12 Carbohydrates

Circle the hemi-acetal portion of the D-glucose ring shown above. Point Down. Point up ... of acid is present, the hemi-acetal portion of the above molecule ...

Carbohydrates Polysaccharides Figure 20.3 Amylopectin, a branched polymer of approximately 10,000 units of D-glucose joined by -1,4-glycosidic bonds.

* When the IUPAC rules are used to name an alcohol, the main chain (the longest continuous carbon chain carrying the -OH group) ... Examples: * What is the ...

Guest Lecturer: Prof. Jonathan L. Sessler

Las reacciones de deshidrataci n ocurren cuando se elimina una mol cula de agua ... Se producen cuando una sustancia gana electrones, se pueden reconocer por la ...

Benedict's Test. Benedict's reagent, which contains Cu2 , reacts with aldehydes that have an ... Test for glucose (Benedict's test) 8. Addition Reactions ...

Chapter 9 Aldehydes and Ketones Keto-Enol Tautomerism A carbon atom adjacent to a carbonyl group is called an (alpha) -carbon, and a hydrogen atom bonded to it is ...

Chapter 17 Aldehydes and Ketones

Chapter 17: Carbohydrates Suggested Problems: 4, 9, 21, 53, 61, 62, 63

Medical Biochemistry Molecular Principles of Structural Organization of Cells CARBOHYDRATES CARBOHYDRATES Are hydrated carbon molecules [CnH2nOn or (CH2O)n ...

Carbohydrates Sugars or Saccharides One of the most abundant compounds of living cells In living cells (plants) - carbohydrates are made by photosynthesis

Chapter 17: Carbohydrates Suggested Problems: 4, 9, 21, 53, 61, 62, 63

William H. Brown & Christopher S. Foote Carbohydrates Chapter 24 Carbohydrates Carbohydrate: a polyhydroxyaldehyde or polyhydroxyketone, or a substance that gives ...

Title: Carey Chapter 25 Carbohydrates Author: Monte Wolf Last modified by: MWolf Created Date: 3/30/2000 4:09:52 PM Document presentation format: On-screen Show

Title: Slide 1 Author: Sinauer Last modified by: LUIS BOLA OS Created Date: 8/15/2002 2:36:39 PM Document presentation format: Presentaci n en pantalla

Title: Organic Chemistry Fifth Edition Subject: Sections 25.1-25.4 Author: Frank Carey Last modified by: SHKim Created Date: 10/24/2000 2:05:48 PM Document ...

Carbenes, :CH2 Preparation of simple carbenes 1. carbene 2. Mechanism of the a elimination. Reactions of Carbenes, :CH2 (not for synthesis) Simmons Smith Reaction ...

Title: OC 2/e Ch 15 Subject: Aldehydes and Ketones Author: Bill Brown Last modified by: Bill Brown Created Date: 8/12/1997 1:32:35 PM Document presentation format

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Chem 341 Review for Finals Structure Determination NMR Chemical shifts, splitting patterns, integrations IR ROH, C=O Formula = # of Rings + Pi-Bonds

At various times, chiral centers have been and are called asymmetric centers or ... the absolute configuration of the chiral atom most remote from the carbonyl group. ...

Bisulfite Addition Addition product. Practical importance: liquid carbonyl compounds can be difficult to purify. The bisulfite addition products will be crystalline ...

Carbohydrates Carbohydrates (or saccharides) consist of only carbon, hydrogen and oxygen Carbohydrates come primarily from plants, however animals can also ...

acetone CH3COCH3. Acetone (CH3COCH3): It is one of the most widely used solvents. ... Acetone is highly volatile and highly flammable. IUPAC Nomenclature of Ketones ...

aromatic, aliphatic, nitrogen. dealkylations(N-, S-, P) deaminations. N-, S-, P- oxidations ... aliphatic. aromatic. aliphatic. BIOTRANSFORMATION - NONSYNTHETIC ...

Organic Chemistry, 5th Edition L. G. Wade, Jr. Chapter 18 Ketones and Aldehydes Jo Blackburn Richland College, Dallas, TX Dallas County Community College District

Most natural saccharides: D-form. this is so called Fisher projection, ... Lactose intolerance - lactase deficiency. Cellobiose -D-Glc-(1-4)-D-Glc. Disaccharides ...

Title: IOC 12 Carbohydrates Author: Bill Brown Last modified by: JEANCARLO4 Document presentation format: Presentaci n en pantalla (4:3) Other titles

Title: Slide 1 Author: Bruce Bailey Last modified by: bbailey Created Date: 9/7/2006 11:14:15 PM Document presentation format: On-screen Show (4:3) Company

BIOLOG A 1 GRADO DE CIENCIAS DEL MAR El prop sito de este trabajo es el de explorar el concepto de Glucosa y analizar los aspectos centrales de la definici n de ...

Chapter 25 Biomolecules: Carbohydrates The Importance of Carbohydrates Carbohydrates are widely distributed in nature. key intermediates in metabolism (sugar ...

Nomenclature. Aldehyde Common Names. The simplest aldehydes are known by their common names: ... IUPAC Nomenclature of Ketones ...

Chapter 8: Carbohydrates monosaccharides. 1. Functions of carbohydrates. ... Functions of carbohydrates. A. Energy. Glucose. Starch and Glycogen. B. ...

... thiol thiol ammonium ion carboxylate ion disulfide sulfide sulfide alkene alcohol aldehyde ketone ether aldehyde phenol ketone no reaction no reaction ...