Stereochemistry, Bonding and Formation

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C-2 Epimer of Alpha-D-Galactose

What monosaccharide is the C-2 epimer of alpha-D-galactose? Are these two molecules diastereomers? Are they enantiomers?

Three 13C and 1H NMR Questions.

The fullly formatted problems are in the attached file. For the compound below, determine how many peaks would be present in the compound's normal 13C decoupled spectrum. Propose structures for compounds that fit the following data: C3H6Br2; 2H quintet at 2.4 ppm J = 6 Hz; 4H triplet at 3.5 ppm J = 6 Hz Draw structures

Reactivity Order of Hydrogen Atoms on Propylbenzene

C6H5(CH2CH2CH3) + (CH3)3COOCl -----> C6H5(CHClCH2CH3) (65%) +C6H5(CH2CHClCH3) (25%) + C6H5(CH2CH2CH2Cl) (10%) 1. Refer to above reaction. When propylbenzene reacts with tert-butylhypochlorite three monochlorinated products are formed in the ratios indicated. Calculate a reactivity order for each type of hydrogen atom in pr

Study Guide for Naming Organic Compounds (inc. 30 Q and A)

This is a study guide for naming of organic compounds, specifically alkanes and substituted alkanes. Thirty (30) questions and answers are also included. The study guide shows you 1) all the steps needed to name alkanes and cycloalkanes from structures. 2) all the steps needed to draw alkanes and cycloalkanes from names. 3

Artifical Sweetners

1. a. What is the name of the chemical used in Sweet 'n Low? Draw the structure. b. Why was a temporary restriction placed on the use of this sweetener? What is the Delaney Amendment? 2. a. What is the chemical name and structure of the sweetener used in Equal and Nutrasweet? b. Read the back of a diet soda can. Who is c

Structure of carbohydrates

Draw the structure of 1. Galactose 2. Glucose (anhydrous) 3. Glucose (hydrated)

Predicting Products of Aromatic Compounds

Please complete the following reactions involving aromatic compounds. If there is more than one product, you must show it and indicate proper stereochemistry. See attached file for full problem description.

Glucose Isomers in Water

Please help with the following problem. When glucose is placed in water two stereoisomers are formed, one with the new OH on the opposite side of the ring than the 6th carbon, the α (alpha) isomer; and the other with the new OH group on the same side of the ring as the 6th carbon, β (beta) - anomer. Thus, a new chiral car

D-glucose Isomers Open-Chain Models

1. Draw and construct the open-chain model of glucose a. How many chiral carbons are in the open-chain version of glucose? b. How many different stereoisomers are possible with that number of chiral carbons? c. What shape does your open-chain model naturally take?

Liquid crystals

Are there differences between the cholesteryl benzoates and the cholesteryl esters having long carbon chains? why or why not?

Differentiate between cis and trans isomers

Why do cis and trans isomeric compounds exhibit different properties?

Organic Chemistry Questions: stereochemistry and chirality centers

See attached file for full problem description. 1. Write the complete stepwise mechanism for this reaction. Be sure to show all intermediate structures and all electron flow using arrows. 2. Predict the products of the following reaction. Indicate regiochemistry and stereochemistry when relevant.

Predict stereochemistry of product and mechanism of reaction

Questions to answer: 1. Determine the stereochemistry of the product and propose a mechanism for the reaction. 2. From the melting point of the product, decide whether the the addition of bromine followed a syn or anti mechanism? Why?

Isomers for C5H10Br2, IUPAC system

Draw structures for all possible isomers for C5H10Br2, and name each isomer by the IUPAC system.

Inversion of Configuration and Determination of R/S

Draw a compound with an asymmetric center. Rotate so that you can determine whether it is R or S. Invert the stereochemistry. Rotate to help determine R or S. Comment using appropriate views as illustrations.

structures of alklycyclohexane and 1,3-dialkylcyclohexane

Please draw the structures neatly and clearly and follow directions. If you have a Chem drawing program (i.e. ChemDraw, Chem3D), if not please draw them out by hand. (1) Strain or Steric energy (a) Draw an alklycyclohexane and determine the strain energy for equatorial and axial positions of the alkyl group. The ea

Resonance structures

Draw all resonance structures possible for the following ionic species: Make sure you clearly show all lone pairs and any formal charges. (See attached file for full problem description)

Lewis structures and polarity of molecules

Draw the Lewis dot structure for the following molecules. Use VSEPR theory to predict three-dimensional structure. Then predict whether the molecule is polar or non polar. Sulfur dichloride Silicon tetrabromide Oxygen difluoride Nitrite ion

Drawing Alkane/Alkene Structures

Write the structures of the following compounds a) 2,2-dibromo-3,3-dichloro-5,5-difluoro-6,6-diiodobicyclo{2.2.1}heptane b) hexamethylbicyclo{2.2.0}hexa-2,5-diene

structure of the original peptide

(See attached file for full problem description) Enzyme-catalyzed hydrolysis of a peptide yields mixtures of smaller peptides. Give the structure of the original peptide which yielded these parts following chymotrypsin and trypsin hydrolysis.

Multiple questions on monosaccharides, carbons, and sugars

I need the following questions answered in the next 45 minutes Thanks Sucrose is hydrolyzed to what two monosaccharides? 1. glucose and fructose 2. glucose and galactose 3. galactose and fructose 4. glucose and maltose Question 2 All chiral D-sugars rotate plane-polarized light 1. clo

Proposing a compound structure consistent with an observed NMR spectra

Compound A_1 C_8H_10O_1 has the IR and ^1H NMR spectra shown. Propose a structure consistent with the observed spectra, and assign each peak in the NMR spectrum. Note that the absorption at 5.5 disappears when the D_2O is added. (See attachment for diagram).

Structural Formulas for 4-Hexene

What is 4-hexene? Is there another name for it?

Organic Chemistry

1. The compound 2-methyl-1,4-pentadiene would be classified as what type of diene? a. conjugated b. isolated c. cumulated d. internal 2. Select the least stable diene listed below: a. 2,3-pentadiene b. trans-1,3-pentadiene c. cis-1,3-pentadiene d. 1,4-pentadiene 3. Whic

Conjugation in Alkadienes & Allylic Systems

What are the differences between vinylic & allylic hydrogens in a Cyclohexene (ie. how many of each, what determines it)? Second, what is the best way to determine a conjugated diene? Are there any rules? In 1,1-dimethylallyl the cation is positive: which type of carbon is that, tertiary? In 1,3-butadiene is the act

Ozonolysis of alpha-terpinene

Ignore Structure A in the attached .jpg for this problem. Use only structures C and B Alpha -Terpinene, C10H16, a terpene found in coriander oil, absorbs only two moles of hydrogen, forming p-menthane, C10H20. Ozonolysis of Alpha -terpinene yields structure C in the attached .jpg; permanganate cleavage yields structure B.

Splitting pattern predictions

Help required for predicting the splitting patterns expected for each proton (proton 1 and proton 2) in 2,3-dimethylbutane. What is the number of adjacent hydrogens and what are the splitting patterns?

13C NMR spectral data

I need help with matching the spectral data to the correct structures. Please see attachment.

Stereochemistry of Anthracene and Polycyclic Benzenoid

I need some help with these two questions on stereochemistry, bonding and formation. 1. There are four reasonable resonance structures for anthracene. Draw them. 2. A large number of polycyclic benzenoid aromatic hydrocarbons are known. One of these, benz/a/pyrene, is a powerful carcinogen found in tobacco smoke. From the

SN1 Mechanism

(See attached file for full problem description with reaction) --- Consider the reaction below: If the above reaction occurs via an SN1 reaction mechanism, then propose an explanation for why a racemic mixture is not formed in this reaction. ---