THROUGH-SPACE INTERACTION OF TETHERED GROUPS IN DIPHOSPHA PERI-SUBSTITUTED NAPHTHALENES

Abstract

NMR properties of 1,8-diphosphanaphthalenes with prerequisites for strong through-space interaction were studied. The exceptional magnitude of ⁴J(PP) 246 Hz was found in Nap[P(NMe₂)₂][P(OMe)(NMe₂)] (Nap = naphthalene-1,8-diyl). The P^III, P^V mixed valence systems Nap[P(E)(OMe)₂][P(OMe)₂] (E = O, S, Se) show much lower magnitudes of through-space interaction than expected.

Keywords:

• Chalcogenides
• phosphorus
• strained molecules

Notes

* n = lone pair positioned on respective P atom, its position is calculated by reversing the direction of the vector from the phosphorus atom to the centre of gravity of its methoxy groups.