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*   H-Rearrangements Page
Use the H-Rearrangement page in the Reaction Restriction dialog box to specify the controls for setting four basic hydrogen rearrangements:
The hydrogen rearrangements that involve radical (odd-electron ions) rHA are set by default for hydrogen transfer from a steric optimal atom, usually from a γ-atom (McLafferty rearrangement). A hydrogen shift to an adjacent position (rH1,2) is activated by default and cannot be deactivated. For additional information, see Reaction Formalism.
There are two reasons for changing the default setup of rearrangements:
You are missing an important peak and you suspect an unusual rearrangement. You can compel hydrogen transfer from an α, β, γ, or δ atom.
H-Rearrangement page of the Reaction Restrictions dialog box
In Odd-Electron Ion [rHA]/
Hydrogen Transfer from Atom
In Even-Electron Ion/
Hydrogen Transfer from Atom
α, β, [rHB]
γ [rHC]
Display This Window Every Time Generation of Fragments & Mechanisms Is Started
Opens the Reaction Restrictions dialog box each time you start fragment generation. Clear this check box if you want to use the same parameter settings for subsequent fragment generations and do not want to see this dialog box each time.
If you clear this option and want to return to displaying the Reaction Restrictions dialog box each time you start fragment generation, follow the instructions To restore the Reaction Restrictions dialog box each time you start fragment generation.
Restores all default values in the Reaction Restrictions dialog box. These values take effect after the regeneration of fragments and mechanisms and affect all subsequent generations. The current Fragments & Mechanisms windows are not affected.


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Related Topics:
  Base Page
  Ionization and Cleavage Page
  Resonance Page
  Additional Page
  Sizes Page
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