Ground state conformation of diphenylvinylphosphine sulfide and selenide

Abstract

Single-crystul X-ra?) A, V = 2625.4(9) A3, Z =

Preparation, structure, and some coordination properties of 2-chloro-3,3-diphenyl-3-thioxo-1-(2,4,6-tri-t-butylphenyl)-1,3-diphosphapropene

“…‡ The PNC(Cl)-PNS skeleton displays almost a planar s-cis conformation, which is similar to the case of diphenylvinylphosphine sulfide. 8 The distances of the P1-C1 and the P2-S are close to the average values for the PNC and PNS bonds, respectively. 2,8 A 3-sulfide Z-2 was isomerised to afford the E-isomer, E-2, as a Z+E ratio of 4+1 upon irradiation, whereas no E/Z isomerisation of Z-2 was observed by heating in the refluxing toluene, in contrast to the case of 1 showing no E/Z isomerisation.…”

“…8 The distances of the P1-C1 and the P2-S are close to the average values for the PNC and PNS bonds, respectively. 2,8 A 3-sulfide Z-2 was isomerised to afford the E-isomer, E-2, as a Z+E ratio of 4+1 upon irradiation, whereas no E/Z isomerisation of Z-2 was observed by heating in the refluxing toluene, in contrast to the case of 1 showing no E/Z isomerisation. In the 31 P NMR spectrum, the PNC phosphorus of E-2 appeared at d P 344.0 in a lower field than that of the Zisomer and the P(S)Ph 2 phosphorus appeared at d P 42.1.…”

Preparation, structure and coordination properties of 3,3-bis(diisopropylamino)-3-thioxo-1-(2,4,6-tri-tert-butylphenyl)-1,3-diphosphapropene

“…2 shows the molecular structure of (Z )-3Pt. The geometry of the structure of (Z )-3Pt is almost the same as those 1.651 (8) of 176.58 (7)Њ and S(1)-Pt(1)-Cl(3) of 176.21(6)Њ, respectively. The distance of P᎐ ᎐ C (1.666(5) Å) is smaller than that found in the free ligand (1.68(1) Å), but is comparable to that found in the reported 3,4-bis[(2,4,6-tri-tert-butylphenyl)phosphinylidene]cyclobutene-platinum complex (1.669(3) Å).…”

(+)-(R)-(tert-Butylvinylphosphinoyl)benzene

“…1). This conformational preference has been found without exception in the other three vinylphosphine oxides (Pietrusiewicz, Zablocka, Wieczorek & Brandi, 1991;Pietrusiewicz, Zablocka, Kuznikowski et al, 1991;Wieczorek, 1995), two vinylphosphine sulfides Pietrusiewicz et al, 1992), and one vinylphosphine selenide studied by X-ray diffraction, and has also been considered important in the stereoselective 1,3-dipolar cycloaddition reactions of vinylphosphine chalcogenides with nitrones (Brandi et al, 1989(Brandi et al, , 1991. The crystal structure of (I) also reveals that an R…”