| 21. | Rationale for the Endo Selectivity of the 1, 3-Dipolar Cycloaddition Reaction with a Lewis Acid
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| 22. | Dipolar theism holds that in each pair, both of the characteristics contain some element of good.
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| 23. | E . g . with alkynes they generate pyrazoles in a 1, 3-dipolar cycloaddition.
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| 24. | The coupling is given by g = E \ cdot d ( for electric dipolar coupling ).
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| 25. | He introduced the Jeener-Broekaert sequence for creating observable quantities of dipolar order in solids.
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| 26. | Heteroatom-containing dipolarophiles such as carbonyls and imines can also undergo 1, 3-dipolar cycloaddition.
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| 27. | 1, 3-dipolar cycloaddition reactions between carbonyl ylide dipoles and alkenyl dipolarophiles can generate diastereomeric products.
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| 28. | Two common mechanisms by which electrons and nuclei interact are the Fermi contact interaction and by dipolar interaction.
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| 29. | They apply not only for a perfect dipole field, but also for fields that are approximately dipolar.
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| 30. | The last two nuclei are quadrupolar nuclei whereas the preceding two nuclei ( and ) are dipolar ones.
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