A Novel Phosphorus Heterocycle: 1,2,3,4‐Tetraphenyl‐1,2,3,4‐tetraphospholane

Phosphorus‐Selenium Heterocycles from the Tetraphospholane (PhP)4CH2

“…[4] Compound 5 was prepared by the reaction of 1 with an excess of grey selenium, followed by recrystallisation from hot toluene. [14] All manipulations (unless stated otherwise) were performed under a dry, oxygen-free nitrogen atmosphere using standard Schlenk technique.…”

“…[1] The common ring sizes are four and five, although larger or smaller rings are not unusual. [2,3] The constitutional variability found in pseudo-binary heterocycles (RP) x E y (R ϭ organics, E ϭ S, Se) can be explained by two factors: i) the ease with which their divalent building blocks can rearrange [illustrated, for example, by self-rearrangements of oligomeric (RP) 5 , (RP) 4 and (RP) 6 ], and ii) an ability to form kinetically stable short ''homoatomic'' chains such as -S-S-, -Se-Se-Se-or, as mentioned above, (RP) n . Cyclophosphanes (RP) n together with diphosphenes R-PϭP-R are important precursors here.…”

“…Cyclocarbaphosphanes are generally prepared from metallated oligophosphanes and geminal dichloro compounds [4] (Scheme 1); in a similar manner they are also obtained as relatively stable by-products during the synthesis of bifunctional phosphane ligands. [5,6] Other methods employing Me 3 Si-(tBuP) 4 -SiMe 3 [7] or (iPrPCl) 2 CH 2 [8] have also been reported. Reports on reactions of cyclocarbaphosphanes and related systems with [ The results summarised in Scheme 2 show that, unlike the homo-cyclophosphanes (PR) x , [12] the addition of S to (RP) x (CH 2 ) y does not proceed with cleavage of any PϪP bond.…”

Synthesis and structural studies of polynuclear ruthenium clusters derived from reactions of 1,2,3,4-tetraphenyl-1,2,3,4-tetraphospholane with [Ru3(CO)12]

“…Mixture of dichloromethane and hexane was used in various proportions as eluents for TLC. The starting materials [Ru 3 (CO) 12 )] and [(PPh) 4 CH 2 ] were prepared by literature methods [24,25]. Elemental analysis was carried out at the Microanalytical Laboratory, National University of Singapore.…”

Beiträge zur Chemie des Phosphors, 80 [1] Über die Phosphor-Bor-Dreiringverbindung (t-BuP)2BN(i-Pr)2 / Contributions to the Chemistry of Phosphorus, 80 [1] About the Phosphorus Boron Three-Membered Ring Compound (t-BuP)2BN(i-Pr)2

“…mentdihalogeniden. Dabei entstehen jedoch -unabhängig von der Kettenlänge n des eingesetzten Phosphids -nahezu ausschließlich die beständigen Fünf-ring-Heterocyclophosphane (PR)4E (E = CH2 [8,9], S [10], Se [11]). Verbindungen anderer Ringgröße lagern sich in Gegenwart der nucleophilen Phosphide M I 2(PR)n und des polaren Lösungsmittels Tetrahydrofuran rasch in die weniger reaktiven und vergleichsweise stabileren Fünfring-Heterocyclen um [9].…”