Add time:08/28/2019         Source:sciencedirect.com

Publisher SummaryMany ketones are known and many are of great importance in industry and in biology. Ketones are classified on the basis of their substituents. This chapter introduces various derivatives of ketones such as methoxime derivative. This derivative is useful for determining the presence and number of keto groups as well as for protecting the ketone from enolization. The ketone group can be reduced to an alcohol that can then be silylated. This procedure has been used to identify the keto group in carbohydrates. The study discusses mass spectra of aliphatic ketones and cyclic ketones and shows that aliphatic ions are due to heterolytic cleavage and the acylium ions are due to homolytic cleavage. The peaks representing the acylium ions are usually more intense than representing the alkyl ions. The mass spectra of aliphatic ketones can also exhibit intense peaks that represent ions that are formed through a β cleavage resulting from a γ-hydrogen shift. The fragmentation of ketones has been widely studied and reported in the literature.

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