New applications of tungsten hexachloride (WCl6) in organic synthesis. Halo-de-hydroxylation and dihalo-de-oxo-bisubstitution reactions
作者:Habib. Firouzabadi、Farhad. Shiriny
DOI:10.1016/0040-4020(96)00905-2
日期:1996.11
tungstenhexachloride (WCl6) has been used for the halo-de-hydroxylation and dihalo-de-oxo-bisubstitution reactions of benzylic alcohols, benzaldehydes, acyloins, and epoxides to their chlorides, gem-dichlorides, vic- trichlorides, and vic- dichlorides respectively.
available α,α-dichlorotoluenes enter a vicariousnucleophilicsubstitution (VNS) reaction with electron-deficient arenes to give α-chlorobenzylated nitrobenzenes, as well as six- and five-membered heterocycles. Oxidation of the initially formed α-chlorobenzylic carbanions instead of protonation results in formation of diaryl ketones, providing a means for overall nucleophilic C–H benzoylation of electron-deficient
Conversion of aromatic aldehydes to gem-dichlorides using boron trichloride. A new highly efficient method for preparing dichloroarylmethanes
作者:George W Kabalka、Zhongzhi Wu
DOI:10.1016/s0040-4039(99)02065-1
日期:2000.1
The chlorination of aromaticaldehydes with boron trichloride in hexane under reflux conditions produces the corresponding dichloromethyl derivatives in excellent yields.
Abstract Benzal chlorides and benzal bromides were conveniently synthesized by reaction of aryl aldehydes with a Vilsmeier type reagent formed in situ by reduction of CC14 or CBr4 in dimethylformamide (DMF) as solvent.
Facile Conversion of Aldehydes and Ketones to <i>gem</i>-Dichlorides Using Chlorodiphenylphosphine/N-Chlorosuccinimide as a New and Neutral System
作者:Ghasem Aghapour、Asieh Afzali
DOI:10.1080/00397910802271271
日期:2008.10.28
Abstract Aldehydes and ketones are easily converted to their corresponding gem-dichlorides using a mixture of chlorodiphenylphosphine and N-chlorosuccinimide (ClPPh2/NCS) in dichloromethane under neutral conditions and at room temperature.