Thus diylid 5a reacts readily at room temperature with sterically hindered ketones such as fenchone or di-t-butylketone. However, the residual negative charge in the intermediate adduct 13 slows the decomposition to Wittig products, and is probably responsible for the observed changes (generally ...
Topic: Reactivity of aldehydes vs ketones with ethylene glycol protecting groups? (Read 1732 times) Hello.
摘要: Chlorination of α-seleno-aldehydes bearing an α-hydrogen gives selenium dichlorides which decompose into α-chloro α-seleno-aldehydes and α-chloroenal. Bromination, in all cases, and chlorination for the other α-seleno-aldehydes lead to the α-halogenoaldehydes....
Diazoethenes: their attempted synthesis from aldehydes and aromatic ketones by way of the Horner-Emmons modification of the Wittig reaction. A facile synthesis of alkynes. J. Org. Chem. 47, 1837–1845 (1982). Article CAS Google Scholar Hansmann, M. M., Antoni, P. W. & Pesch, H. ...
Ketones simply have less room for reaction, regardless of the electrostatic favorability of a reaction - and formaldehyde, far more reactive than either aldehydes or ketones, have the most room. In addition, the dipole moment mentioned above is for the whole molecule, not just the carbonyl, ...
Organocadmium compounds are generally considered to be very reactive with acid chlorides, but practically inert towards aldehydes and ketones 1 , thus making possible the important 'Organocadmium synthesis' of ketones 1,2 .doi:10.1038/188140a0KOLLONITSCH...
Synthesis and reactivity of novel alpha,alpha,beta- and alpha,alpha,delta-trichlorinated imines HALOGENATED ALDEHYDES , ALPHA-CYANOENAMINES , REACTION-PRODUCTS , ACID-AMIDES , REARRANGEMENT , AZIRIDINES , AMINES , 2 , 2-DICHLOROALDEHYDES , CHLORINATI... M D'Hooghe,B De Meulenaer,N De Kimpe...
Indeed, as will be covered in detail later, Trp is known to react with aldehydes and ketones to form tetrahydro-β-carbolines (tetHβCs) via the Pictet-Spengler reaction [24]. TetHβC-3-carboxylic acid (26) and 1-methyl-tetHβC-3-carboxylic acid (27) were detected in many commercial ...
Synthesis and reactivity of novel alpha,alpha,beta- and alpha,alpha,delta-trichlorinated imines HALOGENATED ALDEHYDES , ALPHA-CYANOENAMINES , REACTION-PRODUCTS , ACID-AMIDES , REARRANGEMENT , AZIRIDINES , AMINES , 2 , 2-DICHLOROALDEHYDES , CHLORINATI... M D'Hooghe,B De Meulenaer,N De Kimpe...
ring closure reactionsThe hydrolysis of α-amino nitriles in the presence of aqueous aldehydes and ketones is investigated and discussed in detail.doi:10.1002/chin.198939173PASCAL, R.ROUSSET, A.COMMEYRAS, A.WILEY‐VCH Verlag GmbHCheminform