Direct chlorination of alcohols with chlorodimethylsilane catalyzed by a gallium trichloride/tartrate system under neutral conditions
The reaction of secondary alcohols 1 with chlorodimethylsilane (HSiMe 2Cl) proceeded in the presence of a catalytic amount of GaCl 3/diethyl tartrate to give the corresponding organic chlorides 3. In the catalytic cycle, the reaction of diethyl tartrate 4a with HSiMe 2Cl 2 gives the chlorosilyl ether 5 with generation of H2. Alcohol-exchange between the formed chlorosilyl ether 5 and the substrate alcohol 1 affords alkoxychlorosilane 6, which reacts with catalytic GaCl 3 to give the chlorinated product 3. The moderate Lewis acidity of GaCl3 facilitates chlorination. Strong Lewis acids did not give product due to excessive affinity for the oxy-functionalities. Although tertiary alcohols were chlorinated by this system even in the absence of diethyl tartrate, certain alcohols that are less likely to give carbocationic species were effectively chlorinated using the GaCl3/diethyl tartrate system. The Royal Society of Chemistry.
The synthesis of the novel organic donor 1,4-benzothiazinophenothiazine (3) via a double Cadogan-type ring closure is reported.The target molecule is characterized by a 1H NOE-spectrum and by X-ray analysis, thus confirming the "migration" of the l
Kistenmacher, Axel,Baumgarten, Martin,Enkelmann, Volker,Pawlik, Juergen,Muellen, Klaus
p. 2743 - 2747
(2007/10/02)
Geminale Dialkylierung von Ketonen mit Grignard-Verbindungen und Methyltitan(IV)-chloriden