By Martin Windrow
Luftwaffe color Schemes and Markings 1935-45 (Arco-Aircam Aviation sequence No. 26, Vol. 2)
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Extra info for Vol 2 - Luftwaffe Colour Schemes and Markings 1935-45
Thus, for description of the bonding in 12 and 13 the b-type mesomeric structure was preferred . The diphosphirenium cation with two σ4,λ5-P atoms (14) has also been reported. For an explanation of its stability, the effect of σ* aromaticity (interaction of the lone pair at the carbanion with the σ*PN antibonding orbitals) has been considered, although it has not been further investigated . (i-Pr)2N SiMe3 + − P C (i-Pr)2N P+ (i-Pr)2N N(i-Pr)2 14 The presence of the apparently delocalized selenaphospirenium cation 15 has also been observed as a reaction intermediate by 31P NMR spectroscopy with the non-coordinating counteranion CF3SO3–; however, the extent of its aromaticity has not been investigated  (Scheme 15).
Hu 28 34 40 47 66 74 28 L. Nyulászi, Z. Benkő B3LYP BDSHRT BI CASPT2 CASSCF CID DFT DME ELF EPR GIAO GIMIC HF HOMA ISE KS Mes* NICS NHC RE SBA VB 1 Becke three-parameter hybrid functional combined with Lee–Yang– Parr correlation functional Bond shortening index Bird index Complete active space with second-order perturbation theory Complete active space – self-consistent field method Collision-induced dissociation Density functional theory Dimethoxyethane Electron localization function Electron paramagnetic resonance Gauge-including atomic orbital Gauge-including magnetically induced current Hartree–Fock method Harmonic oscillator model of aromaticity Isomeric stabilization energy Kohn–Sham (orbital) 2,4,6-Tri-tert-butylphenyl (supermesityl) Nucleus independent chemical shift N-Heterocyclic carbenes Resonance energy Sum of bond angles Valence bond Introduction The chemistry of phosphorus compounds has shown a steady development in the last 30 years.
4 Five-Membered Rings . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Six-Membered Rings . . . . . . . . . . . . . . . . . . . . . . . . . . . References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Abbreviations AIM ARCS ASE Atoms in molecules Aromatic ring current shielding Aromatic stabilization energy ü ) and Z. Benkő L.