The effect of the solvent upon the rates and mechanisms of organometallic reactions

A nitrogen-base catalyzed generation of organotin(ii) hydride from an organotin trihydride under reductive dihydrogen elimination

“…72 Adducts of a broad variety of (also intramolecular) bases with penta-coordinated tin are well known and crystallographically documented for organotin halides R 4Àn SnX n (with n $ 1). [73][74][75][76][77] However in the case of tetraorgano stannanes without electronegative substituents, indications for donor-acceptor interactions of amines with poorly Lewis acidic Sn is only found in constrained intramolecular arrangements partially leading to increased reactivities of the hydride. [78][79][80][81][82] The poor Lewis acidity may also be seen from the optical stability of chiral stannanes and tin hydrides even in the presence of bases.…”

Tin-119m Moessbauer, infrared, nuclear magnetic resonance, equilibrium, and thermodynamic measurements on complexes of dimethyltin dichloride with substituted 1,10-phenanthrolines and 2,2'-bipyridines

“…80 The magnitude of / rises to 121.1 in HMPA among an order which includes dioxane (73.5) < acetone (91.5) < DME (96.4) < DMF (109.8) < DMSO (114.8 Hz). 79 The values listed in VI shows that the order of enthalpies, 5-CH3 > 5-C6H5 > 5-C1 > 5-Br > H > 5-N02, is followed by the / values except for the parent ligand which returns to the top of the list, above the 5-CH3 derivative.…”

Photolysis of polymeric organosilicon systems. 4. Photochemical behavior of poly[p-(disilanylene)phenylene]

“…(Milan) 1964, 1492. (7) Gilman, H.; Atwell, W. H.; Schwebke, G. L. J. Organomet. Chem. 1964, 2, 369.…”

“…The organic layer was separated and filtered. The filtrate was concentrated, and the resulting white solid was purified twice by reprecipitation from benzene-ethanol and then from benzene-isopropyl alcohol to give 22 g (45% yield) of polymer 2: mp 152-164 °C; Mw 27500; NMR 0.62 (s, 6 H, MeSi), 7.28 and 7.35 (m, 14 H, phenyl and phenylene ring protons). Anal.…”

“…100 mL of dry benzene was irradiated with a 10-W low-pressure mercury lamp at room temperature for 12.5 h. The solvent benzene and the remaining methanol-dj were evaporated, and the residue (0.55 g) was chromatographed by using a 1.8 X 25 cm silica gel column which had been packed in hexane. The column was eluted with a 3:2 mixture of hexane and benzene to give 30 mg (5 wt %, Mw 1000) of the product and then eluted with THF to give 0.456 g (83 wt %, Mw 1400) of the product: Mw 1000; NMR 0.51-0.70 (m, MeSi), 1.03-1.42 (m, EtSi), 3.52 (s, CH30), 4.73 (m, HSi), 7.65 (br s, ring protons).…”