Phosphorus-nitrogen bonds

New aluminophosphate oxynitrides solid basic catalysts have been synthesised by activation under ammonia of an AIPO4 precursor. When the nitrogen content increases, XPS points out two types of nitrogen phosphorus bonding. The conversions in Knoevenagel condensation are related to the surface nitrogen content. Platinum supported on aluminophosphate oxynitride is an active catalyst for isobutane dehydrogenation. 

Amino groups can also serve to block a position on phosphorus (29, 49). To avoid nitrogen-phosphorus bond cleavage in the synthesis of 41, the lithium reagent was added to the phosphorus halide at —60° yield of 41 was 48% (49).. ... 

The most common cause of chirality is the presence of four different substituents bonded to a tetrahedral atom, but that atom doesn t necessarily have to be carbon. Nitrogen, phosphorus, and sulfur are all commonly encountered in organic molecules, and all can be chirality centers. We know, for instance, that trivalent nitrogen is tetrahedral, with its lone pair of electrons acting as the fourth "substituent" (Section 1.10). Is trivalent nitrogen chiral Does a compound such as ethylmethylamine exist as a pair of enantiomers ... 

The presence of heteroatoms usually provides a convenient feature for improving selectivity by employing selective detection mechanisms. GC may then use flame photometric detection (FPD) for S and P atoms and to a certain extent for N, Se, Si etc. thermoselective detection (TSD) and nitrogen-phosphorus detection (NPD) for N and P atoms electron capture detection (ECD) for halogen atoms (E, Cl, Br, and 1) and for systems with conjugated double bonds and electron-drawing groups or atomic emission detection (AED) for many heteroatoms. 

The decomposition of nitrilotrimethylenetriphosphonic acid in acid solution has been studied. At 125-175° and pH 1.5, carbon-phosphorus bond cleavage occurs, but in 5M HC1 aq. carbon-nitrogen fission becomes important.1" ... 

Acyclic phosphazenes (phosphazo derivatives, phosphine imines, phosphoranimines) continue to attract interest. A review of the three coordinate materials, RN=PR =X has appeared. " Several molecular orbital calculations have been reported. An ab initio treatment of the PN energy surface suggests that this species is best regarded as having a dative phosphorus-nitrogen double bond rather than a triple bond and the phosphonitrene, once formed,... 

Suppose the -1 ion containing one atom each of nitrogen, phosphorus, and carbon could be prepared. Describe the structure of this ion in some detail with regard to the type of bonding and resonance. 

Redmore, D., Phosphorus derivatives of nitrogen heterocycles. 3. Carbon-phosphorus bonding in pyridyl-2- and -4-phosphonates, /. Org. Chem., 38, 1306, 1973. 

De la Torre, R. et al. 1998. Quantitative determination of tricyclic antidepressnts and their metabolites in plasma by solid phase extraction (bond-elut TCA) and separation by capillary gas chromatography with nitrogen-phosphorus detection. Ther Drug Monit. 20 340. 

With the increased electrophilicity of the fluorinated pentacovalent phosphorus, bond formation to nitrogen is close to complete. 

While breaking of the carbon-to-phosphorus bond is a nuisance in catalysis with organometallic complexes, the breaking of carbon-to-nitrogen and -to-sulfur bonds is a desired reaction in the oil industry. Hydrodenitrification (HDN) and hydrodesulfurisation (HDS) are carried out on a large scale in order to remove nitrogen and sulfur from the fuel feedstocks. 

Carbon-nitrogen bond formation, by reductive amination, 59, 1 Carbon-phosphorus bond formation, 36, 2 Carbonyl compounds, addition of... 

Formation of two bonds Four-atom fragments arui nitrogen, phosphorus, or group VIII metal 885... 

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