The Synthesis and Structure of the First Representatives of Oligoarylenephosphocyclanes

Cyclo-bis{1-[p-(p-phenylenomethyl)phenyl]-3,7-diphenyl-1,5,3,7-diazadiphosphacyclooctane} as the first representative of a new type of nitrogen-containing macroheterocyclic phosphines

“…The predominant formation of the macrocycle is most likely determined by a favourable spatial structure of the initial diamine, because a series of macrocyclic diphosphonites obtained from 4,4'-dihydroxydiphenylmethane were described. 4 The absorption bands of hydroxyl and amino groups are absent in the IR spectrum of 1; in general, the spectrum is almost identical to the spectrum of the corresponding oligomer. 1 The 31 P NMR spectrum shows one signal with a chemical shift of -52.59 ppm (the average chemical shift of diazadiphosphacyclooctanes is -51 ppm 5 ) and points to the equivalence of all phosphorus atoms and hence to a symmetrical structure of the macrocycle in solutions.…”

Synthesis of arylenephosphamacrocycles using tri- and pentavalent phosphorus compounds

“…The structure of cyclophenylphosphonite 15 was studied by X-ray analysis. 17 The phosphorus atoms and the quaternary carbon atoms approximately occupy the corners of a square. The angle between the DIAN aromatic rings is 358 so the whole system has a cavity.…”