Heteroaromatische Komplexliganden. Die Kristallstruktur von Pentacarbonyl(2,4,6‐triphenyl‐phosphorin)chrom(0)

Abstract

Pentacarbonyl(2,4,6-triphenylphosphorin)chrom(O) kristallisiert monoklin in der Raumgruppe P21/c mit vier Molekiilen in der Elementarzelle. Die Pentacarbonylchromgruppe ist so an das Phosphoratom des Phosphorin-Ringes koordiniert, da8 die Cr -P-Bindung um 8" gegen die Ringebene geneigt ist. Die Cr-P-Bindung ist mit 2.37 8, relativ kurz. Der Phosphorin-King ist planar. Seine Geometrie stimmt weitgehend mit der P-unsubstituierter Phosphorine uberein. Heteroaromatic Complex LigandsThe Crystal Structure of Pentacarbonyl(2,4,6-triphenylphosphorine)chromium(O~ Pentacarbonyl(2,4,6-triphenylphosphorine)chromium crystallizes in thc monoclinic space group P21/c with four molecules in the unit cell. The pentacarbonyl chromium moiety is coordinated to the phosphorus atom of the phosphorine ring in such a way that the Cr -P bond is inclined by an angle of 8 degrees out of the ring plane. The Cr-P bond of 2.37 A is relatively short. The phosphorine ring i s planar. Its geometry closely resembles that of P-unsubstituted phosphorines.

3‐Bromo‐2‐Pyrone: An Alternative and Convenient Route to Functionalized Phosphinines

“…Due to the rather sterically demanding TMS group and the Br substituent both in α‐position of the phosphorus heterocycle, the planar aromatic ring is rotated out of the plane defined by three of the five carbonyl ligands and the phosphinine moiety (dihedral angle C(10)−W(1)−P(1)−C(5)=41.9°). A similar conformation has been observed for phosphinine complexes containing a Cr(CO) 5 or W(CO) 5 fragment …”

“…As imilar conformation has been observed for phosphininec omplexes containing aC r(CO) 5 or W(CO) 5 fragment. [17,18] The structuralc haracterizationo f20 nicely proves that the phosphinine 19 was regioselectivelyf ormed in af acile manner, (1) 1.213(11), C(1)ÀC(2) 1.451 (11), C(2)ÀC(3) 1.349 (10), C(3)ÀC(4) 1.415 (10), C(4)ÀC (5) 1.351(11), C(5)ÀO(1) 1.355(9), C(2)À Br(1)1.891 (7). www.chemeurj.org startingf rom 3-bromo-2-pyrone (16)a nd Me 3 Si-C P. This methodc an, thus, be used for the convenient synthesis of 6bromo-a nd 2-TMS-functionalized phosphinines and the overall reactionsequence is summarized in Scheme 8.…”

Structure of η5-cyclopentadienyl(η6-2,4,6-triphenylphosphorin)manganese(I)

“…Since several complexes of phosphorins with transition metals have been described in the literature, but only two structural studies of such complexes are currently available (Vahrenkamp & N6th, 1972(Vahrenkamp & N6th, , 1973, we decided to undertake the determination of the crystal structure of the recently synthetized title compound (A) (Nief, Charrier, Mathey & Simalty, 1980). Compound (A) is also interesting because no structural data are available at the present time on sandwich complexes of Mn ~.…”

Crystal Structures of the Gold(I) Phosphinine Complexes [AuCl(C5H2P-2,6-Me2-4-Ph)] and [AuCl(C5H2P-2,4,6-Ph3)]

“…The first transition metal complexes containing phosphinine ligands were already described in the early 1970s by the groups of Nöth [10 -13], Fraser [14], Schmidbaur [15], and Dimroth [16]. Single-crystal X-ray diffraction studies performed by Vahrenkamp and Nöth for the metal carbonyl complexes [Cr(κP-C 5 H 2 P-2,4,6-Ph 3 )(CO) 5 ] [11] and [Cr(η 6 -C 5 H 2 P-2,4,6-Ph 3 )(CO) 3 ] [12] revealed that phosphinines can coordinate via their P lone pair and also via their π system. Homologous molybdenum and tungsten pentacarbonyl complexes were structurally characterised by the groups of Ashe [17] and Mathey [18].…”