A study of some cations formed in the ammonia chemical ionization of ketones using mass analysed ion kinetic energy spectrometrydoi:10.1002/oms.1210150712André MaquestiauDepartment of Organic Chemistry, State University of Mons, 7000 Mons, BelgiumRobert Flammang...
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 novel reagents formed by combination of allylmagnesium chloride and a strong non-nucleophilic lithium base (LiNR2) convert non- or slowly enolizable carboxylic esters or carboxamides into 2-propenyl ketones which are protected from further reaction by their in situ conversion into enolates. This...
It was established by IR, UV, and PMR spectroscopy that 2-phenacylidenebenzo-1,4-thiazin-3-ones are formed in the reaction of o-aminothiophenol with aroylp... YS Andreichikov,SP Tendryakova,YANA Voronova - 《Chemistry of Heterocyclic Compounds》 被引量: 8发表: 1977年 ...
Ketone reductions are slower but can be accelerated by using 5 equiv of acetic acid. Aldehydes can be selectively reduced in the presence of ketones. On a small scale, products are isolated by evaporation of the reaction mixture and direct chromatography....
The diaryl ketones (I) undergo pressure reaction with ammonia (III) and ammonium chloride (II), producing the ketimines (IV) which are isolated in the form... G Verardo,AG Giumanini,P Strazzolini,... - 《Cheminform》 被引量: 41发表: 1989年 Synthesis of N-Unprotected Diaryl Ketimines ...
Why are esters less reactive than ketones? « on: April 28, 2012, 11:15:00 AM » I am kind of stuck in a section of my organic chemistry book while I get an aswer to this question. It shows how ketones (and aldehydes) react with alcohols to form ketals. However, they stress...
Aldehydes are commonly prepared by the oxidation of alcohols whose –OH functional group is located on the carbon atom at the end of the chain of carbon atoms in the alcohol: Alcohols that have their –OH groups in the middle of the chain are necessary to synthesize a ketone, which requires...
The reactions were investigated by the use of a variety of individual test compounds containing the target functional groups. The TMPP acetyl ester and TMPP propyl hydrazone derivatives formed with their respective target analytes produced an enhanced response in electrospray ionization mass spectrometry (...
Chemo- and Regioselective Preparation and Reaction of a Kinetic Zinc Enolate Formed from a Thiol Ester and Bis(iodozincio)methane Reactive functionalized enolates that are otherwise difficult to obtain can be prepared in a simple procedure by the treatment of a thiol ester with bis(io... Z Ike...