Phosphorus triamide

The use of molybdenum catalysts in combination with hydrogen peroxide is not so common. Nevertheless, there are a number of systems in which molybdates have been employed for the activation of hydrogen peroxide. A catalytic amount of sodium molybdate in combination with monodentate ligands (e.g., hexaalkyl phosphorus triamides or pyridine-N-oxides), and sulfuric acid allowed the epoxidation of simple linear or cyclic olefins [46]. The selectivity obtained by this method was quite low, and significant amounts of diol were formed, even though highly concentrated hydrogen peroxide (>70%) was employed. 

Phosphorus triamide, hexamethyl- (8,9) (1608-26-0) 9-Phenanthrol, 10-chloro-9,10-dihydro-, acetate (8) 9-Phen-anthrenol, 10-chloro-9,10-dihydro-, acetate (9) (1028-73-5) Trimethylsilyl chloride Silane, chlorotrimethyl- (8,9) (75-77-4) Benz[a]anthracene (8,9) (56-55-3)... 

A 20% excess of hexamethylphosphorus triamide is utilized to increase the reaction rate. When a 10% excess of the phosphine is used, the reaction is not quite complete (as monitored by gas chromatography) even after 3 hours. If the reaction is not allowed to go to completion, the chromatographed product will contain benzyl disulfide. Note that the desulfurization rate for hexaethyl-phosphorus triamide is comparable to that for hexamethylphosphorus triamide. However, the chromatographic separation following the reaction is much more efficient when hexamethylphosphorus triamide is used. 

Phosphorous dichlonde, phenyl-, 55, 128 Phosphorous oxy trichloride, 57, 103 Phosphorous pentachlonde, 57, 63,58, 68 Phosphorus oxychloride, 56, 4 Phosphorus triamide, hexaethyl-, 58, 143 Photocycloaddition reactions, 57, 116 Photolysis, apparatus for, 55,17 Phth-Gly Gly-OEt, 56, 93... 

Thus, a stable derivative of phosphorus triamide, P(NH2)3, could not be obtained. Such expectations were encouraged by recent work of Kodama and Parry (12), who succeeded in ammonolyzing phosphorus trifluoride-borane, F3P.BH3, with formation of a stable phosphorus triamide-borane, (H2N)3P.BH3. Ammonolysis of boron- or phosphorus-fluorine rather than -chlorine bonds is advantageous, since ammonium fluoride is insoluble in liquid ammonia and can easily be separated, while ammonium chloride is readily soluble. 

Another interesting reaction is the action of imines of amidra-zones with hexamethyl phosphorus triamide we have obtained the three isomers of the monosubstituted 1,2,4,3-triazaphosphole (8) ... 

Phosphorus Triamide, P(NH2)3, is said to be formed by the action of dry ammonia on phosphorus tribromide at -70° C. It was a yellow solid which decomposed at 0° C. giving a brown substance, diphosphorus triimide, P2(NH)3, and was further decomposed on further heating into phosphorus, nitrogen and ammonia.2... 

Phosphorous dichloride, phenyl-, 55,128 Phosphorus triamide, hexaethyl- [2283-11-6], 58, 143... 

In the chemistry of tervalent phosphorus acid derivatives the development most worthy of comment is the remarkable spontaneous formation of two-co-ordinate amino-iminophosphines from phosphorus triamides. 

In 2009, P-chiral phosphorus triamide ligands were applied in Ni-catalyzed asymmetric hydrovinylation of styrene with promising results, good yields (77%), and good enantioselectivity (up to 63% ee). Recently, phosphoramidite and P-stereogenic phosphorodiamidite ligands L17 and L18 derived from (Sj-2-phenylamino-2 -hydroxy-l,l -binaphthyl (7y-Ph-NOBIN) and bis(l-phenyl-ethyl)amine were synthesized and applied in asymmetric hydrovinylation of styrene, leading to almost perfect selectivity and enantioselectivity (up to 91% ee) (Scheme 9.5). ... 

Among the parent hydrides, phosphorus triamide (triaminophosphine) (7.3a) and the tetra aminophosphonium cation (7.3b), are known. The parent penta and hexa-amides (7.3c) and (7.3d) remain hypothetical compounds although derivatives with up to five and six P-N linkages are known, for example, (7.4). 

If PCI3 is added to a saturated solution of NH3 in chloroform at -78°C, water-soluble phosphorus triamide is produced (7.32). On the other hand, if an excess of PCI3 is added rapidly to liquid NH3, the reaction goes according to (7.33), giving an amorphous red/yellow product. 

On heating, phosphorus triamide will lose ammonia, then hydrogen and nitrogen, to form first the amide imide and eventually (PN) (7.34). The compound HjN-PH-PH-PH-NHj has been obtained in liquid ammonia. 

A typical picture representing the possible sphere of action of the mechanism of reduction by solvated electrons is shown in Figure 4. The upper straight line corresponds to the dark generation of solvated electrons on various cathodes in hexamethyl phosphorus triamide (HMPA) solutions of salts. In... 

Nucleophilic substitution reactions of the secondary sulphonyloxy groups of sulphonate derivatives of cellulose have been investigated in hexamethyl phosphorus triamide using acetoxy-ions as the nucleophile. ... 

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