Scrambling of halide ligands between palladium(II) and between palladium(I) complexes of bis(diphenylphosphino)methane. Observation of unusual temperature-dependent phosphorus-31 NMR chemical shifts

Synthesis, characterization, and reactivity of a novel ruthenium carbonyl cluster containing tri-O-benzyl-d-glucal as a chiral carbohydrate ligand

“…Further, the temperature-dependence of the d p values for the dimetallic mixed-halide ClPd(l-DPPM) 2 collapses to a singlet at 35°C, and reemerges above 45°C [13]. Similar behavior was observed for Ru(II)diphosphine/diiminecomplexes [14].…”

“…The fluxional process at room temperature can be rationalized in terms of two hydride ligands migrating over all three edges of the triruthenium skeleton producing a broad peak. Variable temperature 13 C NMR of I in CDCl 3 at À50°C shows expected three peaks at 206.5, 198.1, and 186.4 due to three CO groups that are dynamic at each ruthenium center. At +20°C, it shows four peaks at 206.5, 197.…”

“…6, 192.8, and 192.1 due to terminal CO groups. 13 C APT spectrum in CD 3 COCD 3 shows four peaks at 207. 1, 198.5, 193.9 and 192.3 due to four carbonyl carbons of ruthenium, three peaks at 138.9, 138.5 and 138.2 due to three quaternary carbons of phenyl groups of benzyl groups in tribenzyl glucal, and four peaks due to benzylic CH 2 carbons as positive peaks; CH carbons of the sixmembered carbohydrate ring and CH carbons of phenyl groups as negative peaks.…”

“…Apparently, they have been transferred to ruthenium skeleton. 13 C NMR spectrum in CDCl 3 shows peaks for both aliphatic and aromatic carbons of the carbohydrate portion of the cluster, and four peaks at 206.5, 197. 6, 192.8, and 192.1 due to terminal CO groups.…”

Assessment of the Reusability of Pd Complexes Supported on Fluorous Silica Gel as Catalysts for Suzuki Couplings

“…4-(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl) [{Bis[P,PЈ-{4- (3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10 31 P NMR chemical shift of the Pd complex of bis(diphenylphosphanyl)methane (δ = -53.7 ppm). [22] [{Bis[P,PЈ-{4- (3,3,4,4,5,5,6,6,7,7,8,8,9,9,10 The other complexes employed in this study were supported on FSG or SG in a similar manner. Supported complexes were prepared with palladium loadings of 0.03, 0.3, 3 and 30 µmol g -1 .…”