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It has also been used to generate aza-Baylis-Hillman adducts with acrylates. [3] It can also serve as a selective deprotectant of N-benzyl groups in the presence of other protecting groups. [4] It is sometimes preferred to diethyl azodicarboxylate (DEAD) because it is more hindered, and thus less likely to form hydrazide byproducts.
Scheme of a Direct-EI, LC-MS interface. A direct electron ionization liquid chromatography–mass spectrometry interface (Direct-EI LC-MS interface) is a technique for coupling liquid chromatography and mass spectrometry based on the direct introduction of the liquid effluent into an electron ionization (EI) source. [1]
The dimer binds a number of classical Lewis bases to form 2:1 adducts: Its Lewis acidity is eclipsed by the enhanced reactivity of rhodium(II) trifluoroacetate, which even binds arenes and alkenes. The acetate group can be replaced by other carboxylates of strong acids. The yields are nearly quantitative.
Ammonium formate can be used for reductive amination of aldehydes and ketones (Leuckart reaction), by the following reaction: [5] Ammonium formate can be used as a mobile phase additive in high performance liquid chromatography (HPLC), and is suitable for use with liquid chromatography-mass spectrometry (LC/MS).
Mass spectrometry is a scientific technique for measuring the mass-to-charge ratio of ions. It is often coupled to chromatographic techniques such as gas-or liquid chromatography and has found widespread adoption in the fields of analytical chemistry and biochemistry where it can be used to identify and characterize small molecules and proteins ().
Atmospheric pressure chemical ionization chamber cross section. Atmospheric pressure chemical ionization (APCI) is an ionization method used in mass spectrometry which utilizes gas-phase ion-molecule reactions at atmospheric pressure (10 5 Pa), [1] [2] commonly coupled with high-performance liquid chromatography (HPLC). [3]
A mass chromatogram is a representation of mass spectrometry data as a chromatogram, where the x-axis represents time and the y-axis represents signal intensity. [1] The source data contains mass information; however, it is not graphically represented in a mass chromatogram in favor of visualizing signal intensity versus time.
In organic chemistry, an addition reaction is an organic reaction in which two or more molecules combine to form a larger molecule called the adduct. [1] [2] An addition reaction is limited to chemical compounds that have multiple bonds. Examples include a molecule with a carbon–carbon double bond (an alkene) or a triple bond (an alkyne).