- 15.4.3: How many signals would you expect to see in the 1 H NMR spectrum of...
- 15.4.4: How many signals would you expect to see in the 1 H NMR spectrum of...
- 15.4.5: How could you distinguish the 1 H NMR spectra of the following comp...
- 15.4.6: Draw an isomer of dichlorocyclopropane that gives an 1 H NMR spectr...
Solutions for Chapter 15.4: The Number of Signals in an 1 H NMR Spectrum
Full solutions for Organic Chemistry | 7th Edition
Next to a carbon-carbon double bond.
A form of magnetism in which unpaired electron spins on adjacent sites point in opposite directions and cancel each other’s effects. (Section 23.1)
Bond dissociation enthalpy
The amount of energy required to break a bond into two radicals in the gas phase at 25°C, A!B !> A• 1 •B
The measurement of heat changes. (6.5)
The potential difference between the cathode and anode in an electrochemical cell; it is measured in volts: 1 V = 1 J>C. Also called electromotive force. (Section 20.4)
An addition reaction in which a nucleophile and a proton are added across the two ends of a conjugated p system.
A situation in which two or more orbitals have the same energy. (Section 6.7)
A compound that rotates plane-polarized light in a clockwise direction (+).
A reaction in which the Gibbs free energy of the products is higher than that of the reactants. The position of equilibrium for an endergonic reaction favors starting materials
The charge on an atom in a polyatomic ion or molecule
The number of times per second that one complete wavelength passes a given point. (Section 6.1)
Matter that has no fixed volume or shape; it conforms to the volume and shape of its container. (Section 1.2)
Water that contains appreciable concentrations of Ca2 + and Mg 2 + ; these ions react with soaps to form an insoluble material. (Section 18.4)
A structure corresponding to a local minimum (valley) in an energy diagram.
An instrument used to measure the precise masses and relative amounts of atomic and molecular ions. (Section 2.4)
Part per million (ppm)
Units used on NMR spectra to record chemical shift relative to the TMS standard.
A compound such as a phenol that selectively reacts with radicals to remove them from a chain reaction and terminate the chain
Resonance in NMR spectroscopy
The absorption of electromagnetic radiation by a precessing nucleus and the resulting “fl ip” of its nuclear spin from the lower energy state to the higher energy state.
Common leaving groups. Examples include tosylate, mesylate, and triflate ions.
Groups that weakly activate an aromatic ring toward electrophilic aromatic substitution, thereby enhancing the rate of the reaction.