Nitrogen storage under

Potassium 3-aniinopropylaniide [56038-00-7] (KAPA), KNHCH2CH2CH2-NH2, pX = 35, can be prepared by the reaction of 1,3-diaminopropane and potassium metal or potassium hydride [7693-26-7] (57—59). KAPA powder has been known to explode during storage under nitrogen in a drybox, and is therefore made in situ. KAPA is extremely effective in converting an internal acetylene or aHene group to a terminal acetylene (60) (see Acetylene-DERIVED chemicals). 

The Ru(II)-BINAP complex,2 [Et2NH2]+[Ru2Cl5(BINAP)2]-,3 is prepared as a toluene solvate in nearly pure form by this procedure. Typical crystallized product shows no other signals in the phosphorus NMR and gives a good combustion analysis. The material is quite stable and can be routinely handled in air. Storage under nitrogen will extend its shelf life, however. 

When distilled at ambient pressure, it polymerised explosively. It distils smoothly under reduced pressure at 33-35°C/127 mbar [1], The polymer produced on expo-sine to air may explode on heating. Presence of a stabiliser is essential during handling or storage under nitrogen at — 20° C [2],... 

Wash the modified surfaces with dry acetone to remove excess reactants and reaction by-products. Dry under nitrogen. The NHS-carbonate groups on the surface are stable to storage under desiccated conditions (package under nitrogen with a desiccant). 

This solid intermediate is reasonably stable to storage under nitrogen however, the yield in the acid hydrolysis step is better when freshly prepared material is hydrolyzed immediately. 

The c-phthalaldehyde reaction compares favourably with the ninhydrin reaction in several respects. The reagent is stable and is in an aqueous form, which eliminates the use of potentially toxic chemicals and storage under nitrogen. Because the reaction proceeds quickly at room temperature there is no need for the 100°C heating bath with all its inherent problems, and the increased sensitivity permits detection at the picomole level. 

When stored at room temperature, phenyl vinyl sulfide becomes yellow-colored within 1 day and a black syrup after 1 week. This decomposition can he substantially retarded by storage under a nitrogen or argon atmosphere in a freezer. 

Storage under dry nitrogen is also recommended since it limits flammability hazards as well as minimizing water pickup. 

Since ethyleneamines react with many other chemicals, dedicated processing equipment is usually desirable. Amines slowly absorb water, carbon dioxide, nitrogen oxides, and oxygen from the atmosphere, which may result in the formation of low concentrations of by-products and generally increase color. Storage under an inert atmosphere minimizes this son of degradation. 

Some precautionary measures for the effective use of BTI have been advised they include protection of BTI from light and its storage under nitrogen, the use of glass-distilled water in the reaction medium, and the exclusion of chloride ions from the starting amide (if it is prepared from an acyl chloride). 

These adhesives must be packed so as to prevent ingress of moisture before application, and to ensure they are in satisfactory condition after distribution and storage. This means in turn, in some instances, that before the packs are closed air must be displaced from them by applying, say, dry nitrogen gas under pressure. When containers of the latter kind have been opened and part of the contents used the material remaining may be de-stabilized and gel quite quickly. 

Lingnert et al. (1983) reported that addition of 0.3% of the Maillard products of histidine and glucose to milk powder and storage under nitrogen gave the reconstituted milk both a low initial intensity of cardboard flavor and almost total inhibition of its further development after reconstitution. 

Compounding the margarine oil blend at the refinery final deodorization shipping the melted blend to the margarine plant and storage under a nitrogen blanket. 

Treseder. K. K. Allen, M. F. (2000). Mycorrhizal fungi have a potential role in soil carbon storage under elevated CO2 and nitrogen deposition. New Phytologist, 147, 189-200. 

Handling, Storage, and Precautions R-SpirOP is obtained as a white solid that is stable in air but decomposes gradually in alcoholic solution. To help prevent oxidation, storage under a nitrogen atmosphere is recommended. The stability of R-SpirOP has been tested in methanol solution through a p NMR study. Observable decomposition occurred in 2 h and complete decomposition in 24 h. 

Diethyl ether is purified and dried in the usual way or by distillation under nitrogen from lithium tetrahydridoaluminate immediately before use and storage under a nitrogen atmosphere. Magnesium turnings are washed before use by shaking them twice with diethyl ether. Alkyl halides are distilled freshly. Since the procedures employed are essentially the same, only the preparation of diethylphenylphosphine is reported in detail as a typical procedure for the preparation of phosphines. 

If heated tanks are used to maintain normally solid polyethylene glycols in a molten state, care must be taken to avoid contamination with iron, which can lead to discoloration. The temperature must be kept to the minimum necessary to ensure fluidity oxidation may occur if polyethylene glycols are exposed for long periods to temperatures exceeding 50°C. However, storage under nitrogen reduces the possibility of oxidation. 

Parameter Initial values Storage under air Storage under nitrogen Storage after addition of 0.5% of cysteine... 

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