Synthesis, Structure, and Reactivity of Stable PN Heterocycles with Two and Six Methyleneamine Units: [H2C?N?N(Me)]2 P(S)(Ph) and [H2C?N?N(Me)]6P3N3

Ring Enlargement of N-Phosphanyl-1,2,3,4-tetrahydroquinazolines

We found that 1-phosphanyl-1,2,3,4-tetrahydroquinazolines undergo ring enlargement. Their treatment with trifluoroacetic or hydrochloric acid afforded diazaphosphepinium salts. Deprotonation of these salts gave the corresponding neutral diazaphosphepines. The reaction of 1-phosphanyl-1,2,3,4-tetrahydroquinazolines with diazomethane or phenylazide afforded triazaphosphocine derivatives via insertion of P-N moiety. At the same time, an analogous hexahydropyrimidine derivative reacted with phenylazide in a normal manner at the phosphorus atom to afford the P(V) derivative.

R. M, Gurusamy Thangavelu SA, Krishnamoorthy A. Tunable yellow–green emitting cyclotriphosphazene appended phenothiazine hydrazone hybrid material: synthesis, characterisation, photophysical and electrochemical studies

A novel tunable yellow–green emitting inorganic–organic luminescent hybrid molecule, CTP-PTZ, an assembly of six units of the PTZ hydrazone Schiff base on the periphery of inorganic heterocycle cyclotriphosphazene, is reported.

Synthesis of onion-peel nanodendritic structures with sequential functional phosphorus diversity

The preparation of novel families of phosphorus-based macromolecular architectures called "onion peel" phosphorus nanodendritic systems is reported. This construct is based on the versatility of methods of synthesis using several building blocks and on the capability of these systems to undergo regioselective reactions within the cascade structure. Sustainable metal-free routes such as the Staudinger reaction or Schiff-base condensation, involving only water and nitrogen as byproducts, allow access to several dendritic macromolecules bearing up to seven different phosphorus units in their backbone, each of them featuring specific reactivity. The presence of the highly aurophilic P=N-P=S fragment enables selective ligation of Au(I) within the dendritic framework.

Synthesis, characterization and biological properties of new hybrid carbosilane–viologen–phosphorus dendrimers

Hybrid carbosilane–viologen–phosphorus dendrimers were prepared, as an example of the synthetic “onion peel” approach, on the search of new physical–chemical and biological properties, respecting traditional dendritic architectures.