Copper perchlorate hexahydrate

Tetrakis(L)copper(I) or Silver (I) Perchlorate prom Isomers A AND B. To a suspension of 0.7 g. (4 mmoles) of isomer A or B in 25 ml. of acetone was added 1 mmole of copper(II) perchlorate hexahydrate or anhydrous silver(I) perchlorate, and the suspension was stirred for 18 hrs. The colorless copper complex was filtered off and dried under vacuum at room temperature. Some reduction to silver metal occurred in the reaction of silver perchlorate. The precipitate was therefore extracted with ethanol, and the extract was filtered and concentrated to obtain the complex. Approximately 30% yields of both compounds were obtained. 

Copper(ll) perchlorate hexahydrate Cu(CI03)3-6H30 10294-46-9 370.639 blue monoci cry Iiyg 82 120 dec 2.22 146 vs FtOH, HOAc, ace si eth... 

Previous preparaticm of copper(II) tetrakis-[l,5-cyclopentamethylenetetrazol] perchlorate (CUL4) in a soluticm of 2,2-dimeflioxypropane (yield 96 %) [35] was replaced by a less efficient (yield 80 %) but economically more suitable route using an aqueous solution or isopropyl alcohol. Schematic representaticMi of the preparation of C11L4 from cupric perchlorate hexahydrate and l -cyclopentamethylenetetrazol (PMT) is shown according to the following scheme ... 

Potassium phosphate monobasic Magnesium sulfate heptahydrate Calcium chloride dihydrate Zinc sulfate heptahydrate Ferric sulfate heptahydrate Copper sulfate pentahydrate Cobalt(II) chloride hexahydrate Perchloric acid Potassium hydrocarbonate... 

The use of catalyst 187 or 188 (see Sch. 43) in cycloadditions requires anhydrous conditions. Recently, several practical alternatives for this requirement have been reported. Evans has shown that the easily manipulated aquo complex prepared from 187 and water can be dehydrated to the active catalyst in the reaction vessel by addition of molecular sieves, without any loss of reactivity or selectivity [87]. Copper(II) perchlorate is available commercially as a hexahydrate. Ghosh and co-workers have reported that a complex 207 prepared from an aminoindanol-derived bisoxazoline and Cu(C104)2 6H2O is an excellent Lewis acid in Diels-Alder reactions (Sch. 46). It is interesting to note that the generally sluggish reactions with oxazolidinone croto-nates proceed with very high selectivity at room temperature [88]. 

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