Phosphorus I

An alkyl group can also migrate from oxygen to nitrogen or phosphorus [I, 72] (Michaelis-Arbuzov rearrangement) With this methodology, tetrafluoro-pyndine phosphonates and phosphmates can be obtained [75, 74], Chlorine fluoride... 

Williams, C.H. (1950) Studies on soil phosphorus. I. A method for the partial fractionation of soil phosphorus. Journal of Agricultural Science 40, 233-242. 

Derham said of this phosphorus, I saw some of it, press d widi a Quill that was cut, and it fired Gun-powder about it. Mr. Concle [Kunckel ] writ also with it on Paper, and the Letters all shined in the Dark.. . . My Author says he had once wrapp d up a Knob in Wax, at Hanover, and it being in his Pocket, and he busy near die Fire, die very Heat set it in Flame, and bum d all his Cloaths, and his Fingers also for diough he rubbed diem in die Dirt, notiling would quench it, unless he had had Water, he was ill for 15 Days, and the Skin came off.. . ... 

Flammability of Phosphorus. i Perjorm the experiment in a jume cupboard ). Put a small amount of dry red phosphorus on the edge of an iron plate placed on a ring of a stand and a small piece of white phosphorus on its other edge. Heat the plate with a burner closer to the edge where the red phosphorus is. What happens Write the equation of the reaction. 

Pentacarbonyl[trIs(dImethy1 ami no)-phosphorus(I I I)]molybdenum(0), AU06... 

I. Remsen and E. H. Keiser considered that they had obtained a special allotropic form of phosphorus by suddenly cooling the vapour of phosphorus by iced-water. The product is here red phosphorus, for, as shown by A. Stock and co-workers, red phosphorus can be produced by suddenly quenching phosphorus vapour at 900 -1175. H. M. Vernon reported that rhombic phosphorus, i.e. rhombic crystals of phosphorus, can be obtained by slowly cooling liquid phosphorus. This observation, however, remains unverified ... 

Most commercial engine oils contain the antiwear agent zinc dialkyldithiophosphate (ZDP). The effect of phosphorus derived from oil is of particular concern when the poison concentration in the fuel is very low. One should keep in mind that the ZDP additive contains within its own chemical formula a potential scavenger for phosphorus, i.e., zinc. Other potential scavengers which form stable phosphates, such as alkaline earth metals, are also present in the commercial oil additive package. ... 

Phosphorus compounds, of nitrogen, nomenclature of, 2 285 Phosphorus (I II) cyanide, 6 84... 

One of the simplest methods of estimation of PolyPs in extracts is based on the assay of Pi, which is released from the PolyPs by hydrolysis with 1 M HC1 at 90 °C for 10 min. The Pi released under these conditions is defined as labile phosphorus . If the compounds containing organic labile phosphorus (i.e. nucleotide phosphates, sugar phosphates, etc.) were removed from the extracts by adsorption on Norit charcoal, the increase in Pj content after hydrolysis can be attributed to PolyP and pyrophosphate (PPi). Estimation of the PPj content (Mansurova, 1989) before hydrolysis may be needed in some cases for more precise calculations of the PolyP content. Pi may be determined by one of the well-known chemical methods (Fiske and Subarrow, 1925 Weil-Malerbe and Green, 1951). 

In summary, the CNDO/2 calculations give the following results (1) In PF5, approximately 35% of the total valence shell electron density of the phosphorus, i.e., the electron density associated with all 3a-, 3p-... 

These facts can be explained equally well on the assumption that the acid is tetrabasic, with two atoms of phosphorus, i.e. H4P2Oe, and this view is in accordance with the existence of four salts—MH3P2Oe, M2H2P206, Mj,HPgOs and M4P206.4... 

A 1,2,4-triphosphapentadienide anion from 2,4,6-trimethylbenzoyl chloride [36] A subsequent nucleophilic attack of the negatively polarized sp -hybridized carbon of 3-phenyl-1,3-bis(trimethylsilyl)-1,2-diphosphapropenide at phosphorus, i.e., the positively polarized atom in the P group of phenylmethylidynephosphane, and an attendant 1,3-shift of the trimethylsilyl group fi-om carbon in position 3 to carbon in position 5 should result in the formation of the open chained 3,5-diphenyl-l,5-bis(trimethylsilyl)-l,2,4-triphosphapentadienide anion (Eq. 14). 

R. L. Potter, V. N. DiStefano and S. N. Pox, "The Thermodynamic Functions for Some Combustion Products Containing Phosphorus-I", American Cyanamid Company. 

The dicyanophosphide(l-) ion P(CN)2 may be viewed as a homolog of the dicyanoamide(l-) ion N(CN)2 and related to the thiocyanate ion SCN in the series of (pseudo)halide ions E(CN)7 n = group number of element E). In this sense it can be used in reactions with various kinds of electrophiles to introduce the P(CN)2 group. It may also be viewed as a cyanide complex of cyanophosphinidene PCN or of the phosphorus(I) cation P+, thus, strong nucleophiles replace one or both cyanide ions. ... 

Relatively few phosphido complexes of the transition metals are known that have an alkyl or aryl group (R) in addition to hydrogen attached to phosphorus [i.e., R(H)P"]. The reactivity of the P—unit has been studied in only a few cases. The syntheses described here are for dinuclear Rh( +1) or Ni( +1) complexes that have two t-BuP(H)" bridges. In both complexes the metals have pseudotetrahedral geometries. Of added interest for the rhodium complex is the presence of a Rh=Rh double bond. ... 

Ruthenate(2 -), pj-carbido-tetradecacar-bonylpenta-, bis[p-nitrido-bis(triphenyl-phosphorus)( I +)), 26 284... 

HFeN04P.C4,iH , Ferrale(l -), hydrido-tetracarbonyl-, p.-nilrido-bis(triphenyl-phosphorus)( I -f), 26 336... 

Transition metal phosphinidene complexes were originally prepared in order to access what was expected to be a rich chemistry of phosphorus(I)T However, terminal phosphinidenes have been found to be difficult to prepare, partly because they tend to either catenate or bridge. This is a manifestation of the double-bond rule for the main group elements. However, breakthroughs in syntheses of these complexes came about through the use of devious synthetic techniques in combination with sterically encumbered ligands. 

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