29512-02-5Relevant academic research and scientific papers
Electrophilic Reactions of Activated Alkenes and Alkynes with Element Halides. III. Reaction of Activated Alkenes with Phosphorus Trihalides
Kazankova,Trostyanskaya,Efimova,Beletskaya
, p. 1606 - 1619 (2007/10/03)
Electrophilic substitution of the vinyl hydrogen atom in alkenyl alkyl ethers, 2-bromoethenyl alkyl ethers, and ketene acetals readily occurs under the action of phosphorus trihalides in the presence of an organic base to yield 70-98% of 2-alkoxy-, 2-alkoxy-1-bromo-, and 2,2-dialkoxyalkenylphosphonous dichlorides and dibromides. The reaction is regio- and stereospecific. A mechanism involving intermediate formation of a cyclic phosphiranium ion is proposed.
Untersuchungen im Wittig-System nach einem ordnenden Konzept auf der Basis alternativer Prinzipien
Bandmann, Heinz,Bartik, Tamas,Bauckloh, Sylvia,Behler, Ansgar,Brille, Frank,et al.
, p. 193 - 204 (2007/10/02)
Our results show that the stereoselectivity of the Wittig-reaction can be controlled by the variation of substituents in accord with the ORDERING CONCEPT OF ALTERNATIV PRINCIPLES (individual pairs, known and unknown classes of alternatives).The "all-phenyl Wittig-system" having three phenyl groups on phosphorous two in ylid- and aldehyd-position was chosen as a standard for our investigations.Differentiation in ylid-position and compensation on phosphorous and aldehyd-position were observed by the comparison of "patterns".Consequently, most of the selectivity rules of Wittig-reactions can be explained by the differentiation through alternatives in the ylid-position.Inversion or conservation of the "patterns" of measured data points to the variation in structure of starting materials, reaction rates and selectivities.Amount-controls were also described in certain systems.
AN IMPROVED METHOD FOR THE EFFICIENT CONVERSION OF UNSATURATED ALCOHOLS, ETHERS AND ESTERS TO THEIR CORRESPONDING ALDEHYDES, KETONES, ENOL ETHERS AND ENOL ESTERS
Iranpoor, N.,Imanieh, H.,Forbes, E. J.
, p. 2955 - 2962 (2007/10/02)
Catalytic conversion of unsaturated alcohols to their corresponding aldehydes and ketones with nonacarbonyl diiron in benzene at 40-50 deg C are performed efficiently in high yields.The efficient preparation of some enol ethers and also preparation of a few esters from their corresponding unsaturated ethers and esters are also performed by this method.
SYNTHESE ET PROPRIETES D'ETHERS β-MONOFLUORES
Baklouti, A.,Chaabouni, M. M.
, p. 45 - 56 (2007/10/02)
Two methods have been used for the synthesis of β-monofluorinated ethers.One is the methylation of α-fluorinated alcoholates obtained from corresponding 2-fluoroalcohols by action of NaH in T.H.F.The second method is the nucleophilic substitution of tosyl
