Morris, Louis J.; Hill, Michael S.; Mahon, Mary F.; Manners, Ian; McMenamy, Fred S.; Whittell, George R. published the artcile< Heavier Alkaline-Earth Catalyzed Dehydrocoupling of Silanes and Alcohols for the Synthesis of Metallo-Polysilylethers>, Name: Triphenylmethanol, the main research area is alk earth alkoxide preparation catalyst dehydrocoupling silane alc; crystal structure dinuclear barium calcium strontium bridging phenylmethoxide ferrocenylsiloxane; mol structure dinuclear barium calcium strontium bridging phenylmethoxide ferrocenylsiloxane; dehydrocoupling kinetics silane alc alk earth triphenylmethoxide catalyst; metallopolysilylether preparation; alkaline earth metals; barium; calcium; dehydrocoupling; metallopolymers; strontium.
The dehydrocoupling of silanes and alcs. mediated by heavier alk.-earth catalysts, [Ae{N(SiMe3)2}2·(THF)2] (I-III) and [Ae{CH(SiMe3)2}2·(THF)2], (IV-VI) (Ae = Ca, Sr, Ba) is described. Primary, secondary, and tertiary alcs. were coupled to phenylsilane or diphenylsilane, whereas tertiary silanes are less tolerant towards bulky substrates. Some control over reaction selectivity towards mono-, di-, or tri-substituted silylether products was achieved through alteration of reaction stoichiometry, conditions, and catalyst. The ferrocenyl silylether, FeCp(C5H4SiPh(OBn)2) (2), was prepared and fully characterized from the ferrocenylsilane, FeCp(C5H4SiPhH2) (1), and benzyl alc. using Ba catalysis. Stoichiometric experiments suggested a reaction manifold involving the formation of Ae-alkoxide and hydride species, and dimeric Ae-alkoxides [(Ph3CO)Ae(μ2-OCPh3)Ae(THF)] (3a-c, Ae = Ca, Sr, Ba) were isolated and fully characterized. Mechanistic experiments suggested a complex reaction mechanism involving dimeric or polynuclear active species, whose kinetics are highly dependent on variables such as the identity and concentration of the precatalyst, silane, and alc. Turnover frequencies increase on descending Group 2 of the periodic table, with the Ba precatalyst III displaying an apparent 1st-order dependence in both silane and alc., and an optimum catalyst loading of 3 mol% Ba, above which activity decreases. With precatalyst III in THF, ferrocene-containing poly- and oligosilylethers with ferrocene pendent to (P1-P4) or as a constituent (P5, P6) of the main polymer chain were prepared from 1 or Fe(C5H4SiPhH2)2 (4) with diols 1,4-(HOCH2)2-(C6H4) and 1,4-(CHMeOH)2(C6H4), resp. The resultant materials were characterized by NMR spectroscopy, gel permeation chromatog. (GPC) and DOSY NMR spectroscopy, with estimated mol. weights >20,000 Da for P1 and P4. The Fe centers display reversible redox behavior and thermal anal. showed P1 and P5 to be promising precursors to magnetic ceramic materials.
Chemistry – A European Journal published new progress about Alcohols Role: PEP (Physical, Engineering or Chemical Process), PRP (Properties), RCT (Reactant), PROC (Process), RACT (Reactant or Reagent). 76-84-6 belongs to class alcohols-buliding-blocks, and the molecular formula is C19H16O, Name: Triphenylmethanol.
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts