Lithium sealing methods

Alkyl and acyl derivatives (28, 30) of 14-aminocodeinones (13, 26) and dihydro-codeinones (20a, 27) are readily prepared acylation is achieved under standard conditions of acid chloride or acid anhydride in the presence of an organic base, while alkylation can be achieved directly with an alkyl halide or by acylation and then lithium aluminium hydride reduction (Scheme 5). In this latter method the 6-keto group is protected as an acetal [8, 9, 18, 19]. For direct alkylation with unactivated alkyl halides, carrying out the reaction in a sealed tube at 120 °C has... 

Lithium titanate could be prepared by using a sealed tube method. As the alkali metals can react with glass, the tube must be coated with graphite by decomposition of an organic solvent on the surface. Then a mixture of lithium oxide and titanium dioxide could be weighed out in a glove box, placed in the tube and the tube evacuated. Once sealed off, the whole tube could be heated in a furnace. Alternatively, a mixture of lithium carbonate (in excess) and titanium dioxide could be pressed into pellets and heated. The required excess of lithium carbonate would have to be determined by trial and error. 

Treatment of (31) with crotyl chloride-potassium carbonate in DMF afforded (33), which was converted into (34) by heating in a sealed tube. Methylation of the phenol (34) with methyl iodide-potassium carbonate gave (35). Osmic acid-sodium periodate oxidation produced the keto-aldehyde (36). Acetalization by standard methods gave the diacetal (37). Reduction of (37) with lithium in liquid ammonia and subsequent toluene-p-sulphonic acid work-up afforded (38) in a yield of 50 %. A vinylogous aldol condensation was effected with methan-olic potassium hydroxide. The resulting mixture was oxidized with chromium... 

DISPOSAL AND STORAGE METHODS platinum and soluble platinum salts may be disposed of in sealed containers in a secured, sanitary landfill store in a cool, dry location, maintain adequate ventilation keep in tightly closed containers, protected from light separate from incompatibles such as aluminum, phosphorus, lithium, tellurium, selenium, arsenic, and various fluorides. 

Eu304(cr) can be prepared by reacting stoichiometric amounts of EuO and EuyOs in a sealed tube at 1170 K, which indicates that it is stable with respect to the end-member oxides, or by other methods, e.g. reaction of the sesquioxide, the oxide chloride and lithium hydride [83], or even by high-temperature decomposition of EuO [47] ... 

To conduct a water sorption study, the product was stored in desiccators with solid salt or saturated salt solutions for 48 h of equilibration at an ambient temperature (Figure 8). The salts included phosphorus pentoxide, lithium chloride, potassium acetate, magnesium chloride, potassium carbonate, and sodium chloride, which generated relative humidities of, approximately, 0, 11, 23, 33, 43, and 75%, respectively. The vials were sealed immediately after equilibration. The moisture in the lyophilized product was determined by the Karl Fischer method. 

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