Alternative Preparation Routes

Consistent with this NNO can be made from NH4N03, and N NO from NH4 N03. Alternative preparative routes (Fig. 11.9) are the reduction of aqueous nitrous acid with either hydroxylamine or hydrogen azide ... 

In view of the difficulties in controlling the electroplating of speculum and bronze coatings, alternative preparation routes through the heat treatment of duplex tin and copper electroplated finishes have been proposed. ... 

An alternative preparative route to R2QER acid esters (Q = P, As, Sb, Bi E = S, Se, Te) of interest due to its generally applicability to all the heavier group 15 and 16 elements, is the dismutation reaction between diorganodichalco-genides and tetraorgano-diphosphines, -diarsines, -distibines or -dibismuthines (Equation 17).2... 

The mixture, which contains about 20 mole% KSO,F, can be prepared by shaking finely divided, anhydrous KF with an excess of liquid SOj in a sealed pressure vessel for 5 days. Pure KSOjF is available commercially from, for example, PCR Inc., P.O. Box 1466, Gainesville, FL, or through use of an alternative preparative route a % excess over the stoichiometric quantity is required if the pure material is used. 

It should be noted that Vogt et al. and de Boer et al. recently reported on an alternative preparation route which consisted of deposition-precipitation of Mo " " from homogeneous solution onto Si02. The authors claim that this technique leads to highly dispersed catalysts. 

Cuadrado and co-workers prepared polysiloxanes with ferrocene and cobalticenium moieties in their backbone.180,181 Polymetallocene, 94, was synthesized by reacting l,3-bis(3-aminopropyl)-l,l,3,3-tetramethyldisiloxane with 1,1 -bis(chlorocarbonyl)ferrocene or 1,1 -bis(chlorocarbonyl)cobalticenium hexafluorophosphate. The organoiron polymer displayed a Mn = 10,600,180 whereas the organocobalt polymer possessed very low solubility in polar organic solvents.181 An alternative preparative route to this class of polymer is the reaction of l,l -bis((3-aminoethyl)ferrocene with dimethylbis(4-chlorocarbonylphenyl) silane.180... 

An alternative preparative route to the unstable phosphorus thiocyanates uses McsSiCN in reaction with sulphenyl chlorides R R P(0)SC1, where R = R = Me3CCH20 or Me2CHO, and R = Me C, R = Ph. Because of steric effects, these products are more stable than those previously isolated. 

UHTCs indicate that SHS powders possess improved sintering ability in comparison with analogous materials produced using alternative preparation routes. 

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