Crystal and molecular structure of the trimethyltin chloride complex of triphenylphosphine–acetylmethylene

Abstract

Trimethyltin chloride-triphenylphosphineacetylmethylene is 0 rather than C-bonded. MERCURY (11) halides react with cc-carbonyl phosphorusylides to give stable C-mercurated phosphonium sa1ts.l

Synthesis, characterization, and spectroscopic studies of palladium(II) and silver(I) complexes of 4-methoxybenzoylmethylenetriphenylphosphorane and 4-fluorobenzoylmethylenetriphenylphosphorane

“…In the present study, the m(P + -C -) values for all five complexes were shifted to lower frequency (Table 1), suggesting some removal of electron density from the P-C bond. The 1 HNMR spectra of complexes (1)-(4) show a doublet or broad signal attributed to the proton methine CH at 4.3-4.5 ppm with 2 J (PH) = 25 Hz (1); these values are close to those observed in other O-bound complexes [6,[12][13][14][15].…”

“…Some of these examples contain the ylide O-coordinated to a hard, very exophilic metal center, as Sn(IV) [12] or group 4 metals in high oxidation number [13]. Other attempts to obtain this kind of coordination to soft metals such as Pd(II), Pt(II), and Hg(II) gave C-coordination [16].…”

“…In the compounds reported to date, the chemical behavior of the a-ketostabilized phosphorus ylides has been clearly dominated by the C-coordinated form [7][8][9][10][11], and very few examples of O-coordinated ylides are known [6,[12][13][14][15]. Some of these examples contain the ylide O-coordinated to a hard, very exophilic metal center, as Sn(IV) [12] or group 4 metals in high oxidation number [13].…”

Zur Reaktion von Metall‐koordiniertem Kohlenmonoxid mit Yliden, VI. Anionische Manganacyl‐Phosphor‐Ylide und ihre Umwandlung in neutrale Ylid‐ und „Ylidcarben”︁‐Komplexe

“…Die 'H-und '3C-NMR-Verschiebung der P-Methylgruppen von 2a,b und die GroBe ihrer Kopplungen ,JHCp und Jcp sprechen eindeutig fur das Vorliegen von vierfach koordiniertem Phosphor mit stark positiver Ladung. Im Einklang damit unterscheiden sich die "P-Werte von 2a -c nicht wesentlich von denen der Phosphonium-Kationen [R,PMe]+ (R = Me, Et, n-Bu) [26][27][28]31) . D' ie Protonen des Cyclopentadienylrings von 2b,c liefern ein Multiplett vom AA'BB'-Typ.…”

X-ray and Spectroscopy Studies of Mercury (II) and Silver (I) Complexes of α-Ketostabilized Phosphorus Ylides

“…[6][7][8][9][10][11][12][13][14][15][16][17][18][19] They are versatile ligands for catalysts in a very small number of catalytic reactions such as, for example, the hydrogenation of olefins 20 and the cyclotrimerization 21 and polymerization of acetylenes, 22 but the most important application is in the industrially used SHOP process. 23 The α-keto-stabilized phosphorus ylides are distinguishable from no stabilized ylides, since they can be easily handled due to an additional stabilization from delocalization of the negative charge.…”