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Physical Organic Chemistry
I. Suggest reasonable mechanisms for each of the following reactions.
The starting materials are racemic, unless otherwise stated.
1.
2.
3.
4.
II. The six structures beloware all found to beminima on the [C4H5]+ energy surface. The relative energies from MP2/6-311G(d,p) calculations are shown in kcal/mol. Comment on the stabilizing features that are present in each of these cations.
III. The 13C-NMR chemical shift of the trivalent carbon is a sensitive indicator of carbocation structure. Generally, the greater the chemical shift value, the lower the electron density at the carbon. Data for three different cations with aryl substituents are given below. How do you explain the close similarity of the trend for the first two series and the opposite trend of the third?
Vacuum pumps can achieve very low pressures. If a vacuum pump can generate a vacuum of 1 nTorr at 25 °C, and assuming that air consists of N2 molecules with a collision diameter of 395 pm
Predict the type of bond (ionic, covalent, or polar covalent) one would expect to form for each bond.
What is the hydroxide ion concentration and the pH for a hydrochloric acid solution that has a hydronium ion concentration of 1.50 × 10-3 M?
he synthesis of a phosphodiester bond involves condensation of a5- phosphoryl group on one nucleotide with a 3 hydroxyl
One observation well is located 45 meters away and has a water surface that is 44.35 meters above the bottom of the aquifer. A second observation well is located 85 meters away and has a drawdown of 0.25 meters. What is the coefficient of permeabi..
You have before you two glasses of Amontillado wine - one made last year and one made many years ago. You have claimed to be an expert wine connoisseur (now that you are 21years old, of course) and able to "taste the age" of the wine. If you can dete..
a 15.0-ml sample of nacl solution has a mass of 15.78 g. afterthe nacl solution is evaporated to dryness the dry salt
how many milliliters of concentrated hydrochloric acid solution 36.0 hcl by mass density 1.18 gml are required to
Would the following structures be polar or nonpolar?
Problem- Hexacyanoferrate(III) has one paired electron. Does CN- produce a strong or weak field with Fe in this complex. Is the complex low or high spin
Question- An electron microscope employs a beam of electrons to obtain an image of an object. If the wavelength of the electron is 18.3 pm, what is its velocity
the property of mercury that allows it to form an amalgam with gold has been used in thee mining industry for hundred of years. during the boom in california in the 19th century, it is estimated that 3.0X10^6 pounds of gold were produced using thi..
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