Chemical shift

The 13C NMR Spectrum reveals the chemical environments of the C-H bonds. In this experiment, the carbons were assigned a number, from C1 to C4. C4 appeared the most downfield because it was the most deshielded because it is double bonded directly to an O and thus the O pulls the most on

are conducted experimentally and are obtained in the lab manual on page for both carbon and hydrogen NMR. They ultimately help serve as a guide, narrowing down the range and reaffirming the prediction. Different types of protons have distinct chemical shifts

4-tert¬-butylcyclohaxanone. This confirms that the initial ketone used was 4-tert¬-butylcyclohaxanone. The 1H NMR also proves this. Peaks found at 2.34 ppm, 2.07 ppm, 1.45 ppm and 0.87 ppm show that only four chemical shifts occur in this compound. There are not four types of hydrogens in this molecule, but some chemical environments are similar resulting in only four

also find that at higher temperatures, there is a shift of ratio between α: βwhich at T= 293.2 K, the ratio is at 32:68. This changed of ratio affected by temperatures support the study by Bonner that the higher temperatures allows the anomeric carbon to be more steric

The measured signal is digitized and sent to the computer where the Fourier transformation takes place. The final infrared spectrum is then presented to the user for interpretation. A background spectrum must also be measured with no sample in the beam. This can be compared to the measurement with the sample in the beam to determine the “percent transmittance.” This technique results in a spectrum which has all of the instrumental characteristics removed [195]. Some of the major advantages of FT-IR

Introduction Nuclear magnetic resonance (NMR) spectroscopy and imaging are very useful tools that have practical applications for several different fields. Chemists can use NMR spectroscopy to determine the structure and composition of organic molecules. NMR imaging is used in the field of medicine to view detailed cross-sectional slices of the human body. NMR is used by the petroleum industry as well as the pharmaceutical industry. This report examines how NMR spectroscopy is used to determine the

The Grignard Synthesis of Triphenylmethanol Organic Chemistry Lab II March 19, 2012 Abstract The purpose of this experiment was to synthesize the Grignard reagent, phenyl magnesium bromide, and then use the manufactured Grignard reagent to synthesize the alcohol, triphenylmethanol, by reacting with benzophenone and protonation by H3O+. The triphenylmethanol was purified by recrystallization. The melting point, Infrared Spectroscopy, 13C NMR, and 1H NMR were used to characterize and confirm

The product of interests was able to eventually be separated due to extraction and washing using a separatory funnel and later short path distillation. The addition of water and diethyl ether allowed for the extraction of 1-ethoxybutane into the organic ether layer, and the sodium and bromide ions into the aqueous water layer. This was evident by the disappearance of the precipitate, because sodium bromide dissociated in water into its cation and anion components. In other words, the addition of

The chirality of drugs has become important to understand in the field of medicine and pharmacology today. Asymmetric approaches have been under investigation to synthesize chiral centers or separate enantiomers of chiral molecules using chemical catalysts or enantioselective enzymes. With this is in mind, the experiment performed in lab today exhibits the use of an enzyme catalyzed reduction to fashion a chiral center. In this experiment, the enzymatic asymmetric reduction of 1-phenyl-1,2-propanedione

Experiment B10- Photocromism and Piezochromism Reece Harms 4320288 Introduction This experiment investigates an oxidative coupling reaction in an to synthesise triphenylimidazole dimer from 2,4,5-triphenyl-1H-imidazole. The resulting compound was investigated for both photochromic and piezochromic properties by way of formation of a stable radical, utilizing visual observations and UV-Vis as a means of distinction. Both the oxidative coupling reaction and the dimers interaction with light