Oligocyclic Derivatives From the Partial Bromination of 2-Methyl-5-Phenyl-1,2,4,3-Triazaphosphole

Convenient Synthesis of [1,5-c]Quinazolo-2,3-dihydro-1,2,4,3-triazaphospholes and [1,5-C]Quinazolo-2,3-Dihydro-1,2,4,3-triazaphosphole-3-sulfides

“…Another band in the region around 1620 cm −1 was assigned to the C N fragment. 1 H NMR spectra of 3 displayed in the case of 3a and 3c a signal characteristic for the NH proton at δ = 9.80-10.00 and the expected signals for NMe 2 and the ring bonded methyl groups. 13 C NMR spectra displayed the characteristic signals of all carbons.…”

“…IR spectra were recorded in CHCl 3 solution with a Perkin Elmer Paragon 1,000 PC spectrometer. 1 H and 13 C NMR spectra were recorded with a Brucker AC 300 spectrometer ( 1 H: 300 MHz, 13 C: 75.47 MHz, 31 P: 121.49 MHz) in CDCl 3 , or in a mixture of CDCl 3 and (CD 3 ) 2 SO as solvent containing TMS. The chemical shifts are reported in ppm relative to TMS (internal reference) for 1 H and 13 C and relative to 85% H 3 PO 4 (external reference) for 31 P.…”

Di‐ and Triazaphospholes as Ligands for Ruthenium(II) and Iridium(III) Complexes

“…However, in this study complexes with intact azaphospholes were obtained only with carbonyl complexes, especially of the chromium group 5. In the case of palladium and platinum complexes, the authors only identified intact and unreacted azaphosphole ligands in the 31 P and 195 Pt NMR spectra 6, 7.After subjoining nucleophiles (such as methanol) for addition reactions, single crystals of the reaction products were obtained, where the phosphorus atom had been affected by an 1,2‐addition and the heterocycle had lost its aromaticity. 8.…”

“…The same authors also observed that the five‐membered azaphosphole ring can be opened under the formation of a new bidentate ligand, e.g. P(=O)(OMe)CH 2 C(Me)=NNH(Me), which is able to chelate the metal atom through the phosphorus and the imine nitrogen atoms 7. When Schmidtpeter et al used Me 2 AuCl for coordination reactions of azaphospholes, two different coordination modes of azaphospholes were observed by 1 H and 31 P NMR spectroscopy: the κ 1 ‐N and the κ 1 ‐P ligand function (Scheme ) 9.…”