Method-control strategy, establishment

The benefit of a QbD approach is fhaf mefhod controls are established based on a more extensive data set, which facilitates correlation of method parameters, such as resolution, run time, and column efficiency, with method performance [30]. This allows establishment of more appropriate control strategy. 

These refer to the control of a chemical process and include planning for familiar tasks (e.g., change type of fuel-firing in a furnace) or planning for familiar but infrequent tasks (e.g., start-up or shutdown a furnace). Methods of task analysis and error analysis can be used to analyze well-established strategies that operators use to perform procedural tasks and identify the user s information needs. An implication for display design would be that all information needed... 

The established activity of ethereal a-C-H bonds toward carbene and nitrene insertion has evoked new applications for sulfamate oxidation [76-78] In principle, a C-H center to which an alkoxy group is attached should be a preferred site for amination irrespec-hve of the addihonal functionality on the sulfamate ester backbone (Scheme 17.20). Such a group can thus be used to control the regiochemistry of product formation. The N,0-acetal products generated are iminium ion surrogates, which may be coupled to nucleophiles under Lewis acid-promoted conditions [79]. This strategy makes available substituted oxathiazinanes that are otherwise difficult to prepare in acceptable yields through direct C-H amination methods [80]. 

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