Download e-book for iPad: Microwaves in Organic Synthesis by Antonio de la Hoz, André Loupy

By Antonio de la Hoz, André Loupy

ISBN-10: 3527314520

ISBN-13: 9783527314522

The lengthy awaited new version of this finished two-volume reference has been thoroughly up-to-date and accelerated via 30% to incorporate chapters on ionic beverages, carbohydrate chemistry, multicomponent reactions, reliable part peptide synthesis, carbon nanotubes and fullerenes. Written by way of the main eminent scientists of their respective fields, the chapters, which counterpoint each other, now additionally comprise 8 new fields of software, comparable to heterocyclic chemistry, cycloadditions and carbohydrate chemistry. furthermore, very promising innovations below improvement are taken care of, caused by the applying of microwave irradiation to combinatorial chemistry, radiochemistry and photochemistry.

the traditional reference during this booming box.

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Extra resources for Microwaves in Organic Synthesis

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25 26 1 Microwave–Material Interactions and Dielectric Properties Change of the complex dielectric permittivity with frequency and temperature (e 0 is the real part and e 00 is the imaginary part of the dielectric loss) [70]. Fig. 11. Depending on the values of the working frequency and the relaxation frequency, three general cases can be observed:  case 1, where the real and imaginary parts of the dielectric permittivity decrease with temperature (working frequency lower than relaxation frequency);  case 2, where the real and imaginary parts of the dielectric permittivity increase with temperature (working frequency higher than relaxation frequency); and  case 3, where the real and/or imaginary part of the dielectric have a maximum (working frequency very close to relaxation frequency).

22): 00 emax ¼ es À n 2 2 ð22Þ at a frequency given by Eq. (23): omax ¼ 1 t ð23Þ This macroscopic theory justifies the complex nature of the dielectric permittivity for media with dielectric loss. The real part of the dielectric permittivity expresses the orienting effect of electric field, with the component of polarization which follows the electric field, whereas the other component of the polarization undergoes chaotic motion leading to thermal dissipation of the electromagnetic energy. This description is well adapted to gases (low density of particles).

Pure liquids – water and alcohols Water and peroxides (HOaOH) represent a limiting state of such interactions. In the liquids state, water molecules associate by hydrogen-bond formation. Despite its apparently complex molecular structure, because of its strong association, water closely followed simple Debye relaxation (at 25  C: eSr ¼ 78:2, eyr ¼ 5:5, t ¼ 6:8 Â 10À12 s, and h ¼ 0:02, the Cole–Cole term). In such systems the molecules have usually been rigid dipoles without interaction with neighbors.

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Microwaves in Organic Synthesis by Antonio de la Hoz, André Loupy


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