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Anhydrous cerium(III) chloride — Effect of the drying process on activity and efficiency

✍ Scribed by Vladimir Dimitrov; Kalina Kostova; Miroslav Genov

Book ID
104255767
Publisher
Elsevier Science
Year
1996
Tongue
French
Weight
279 KB
Volume
37
Category
Article
ISSN
0040-4039

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✦ Synopsis

The activity and efficiency of anhydrous CeCI 3 depend strongly on the drying procedure. Deactivation of CeCl 3 occurs during the drying process as a result of hydrolysis by the hydrate water, when heating above 90oc. The highly active CeCI3, prepared by an improved drying procedure, is demonstrated to activate rapidly (in catalytic and stoichiometric amounts) ketones at room temperature, providing excellent addition of organometallic reagents.

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## Abstract A novel and green approach has been described for the synthesis of 2,3‐dihydro‐1__H__‐1,5‐benzodiazepines from __o__‐phenylenediamines and ketones using cerium(III) chloride/sodium iodide supported on silica gel under mild and heterogeneous conditions. The reactions are carried out at r