Results 81 to 90 of about 41,598 (291)

Aluminum versus Gallium: Differences in Bis(bis(trimethylsilyl)methyl) Element Halides, Hydrides, and Oxygen‐Bridged E/P Frustrated Lewis Pairs

ChemistryEurope, EarlyView.
Reacting Bis2GaBr (Bis = CH(SiMe3)2) with Bis2AlH selectively yields Bis2GaH, a monomeric hydride in solution, characterized by diffusion ordered spectroscopy NMR, infrared spectroscopy and indirectly via hydrogallation. A one‐pot route enables frustrated Lewis pairs Bis2EOPtBu2 (E = Al, Ga), with the gallium analog splitting H2 and showing a dynamic ...
Julian Buth, Maximilian J. Klingsiek, Yury V. Vishnevskiy, Andreas Mix, Jan-Hendrik Lamm, Beate Neumann, Hans-Georg Stammler, Norbert Werner Mitzel   +7 more
wiley   +1 more source

Ring‐opening metathesis polymerization‐Derived Organoborane Polymers as Strong Lewis Acids and Luminescent Materials

ChemistryEurope, EarlyView.
Ring‐opening metathesis polymerization offers access to borane polymers with tunable Lewis acidity, environmental stability, and luminescence. The Lewis acid strength approaches that of B(C6F5)3 when R = Cl and Ar = C6F5, high stability is ensured with chlorophenyl or naphthyl pendent groups (Ar = ClPh, Np), and strong emission is achieved with a ...
James McQuade, Fernando Vidal, Mah Noor, Lakshita Anand, Roger A. Lalancette, Frieder Jäkle   +5 more
wiley   +1 more source

Synthese von bicyclischen Lactonen aus Aldehyden und 2,5-Bis(trimethylsiloxy)thiophen

CHIMIA, 1987
By reaction of 2,5-Bis(trimethylsiloxy)thiophene (3) with aldehydes (4) in presence of trimethylsilyl trifluoromethanesulfonate (1) 3,4-disubstituted thiosuccinic anhydrides (5) were obtained. Hydrolysis of the products 5 yields the bislactones 6, 7.
Werner Rzehak, Gerhard Simchen
doaj   +1 more source

One‐Pot Ruthenium‐Catalyzed Synthesis of Benzyl/Allyl‐Halide Substituted (dihydro)naphthalenes via Radical Benzannulation

ChemistryEurope, EarlyView.
A one‐pot protocol to synthesize reactive benzyl‐ and allyl‐halide‐substituted (dihydro)naphthalenes from 2,3‐aryl‐1,3‐butadiene substrates and halogenated alkanes has been developed, using [Cp*RuCl(PPh3)2] as the catalyst. Mechanistic studies revealed an atom transfer radical addition and radical benzannulation sequence, followed by HCl elimination ...
Nicole S. van Leeuwen, David Vesseur, Thijmen Bonhoff, Jeffrey van Laar, Coert E. J. van Lare, Simon Mathew, Sonja Pullen, Joost N. H. Reek, Aalbert Zwijnenburg, Bas de Bruin   +9 more
wiley   +1 more source

Gas-liquid chromatography-mass spectrometry of synthetic ceramides

Journal of Lipid Research, 1969
Two series of ceramides with either sphingosine (sphing-4-enine) or sphinganine as base and with one of the saturated fatty acids C16, C18, C20, C22, C24, C26, or oleic acid were analyzed as the 1,3-di-O-trimethylsilyl ether derivatives by gas ...
Bengt Samuelsson, Karin Samuelsson
doaj   +1 more source

Tetrakis(trimethylsilyl)methane

Acta Crystallographica Section E Structure Reports Online, 2005
The crystal structure of the title compound, C13H36Si4, originally determined by powder diffraction methods, has been redetermined using single-crystal data. The mol­ecule is located on a threefold rotation axis with the methane C and one of the Si atoms located on this axis. All other atoms occupy general positions.
Hans-Wolfram Lerner, Michael Bolte
openaire   +1 more source

The Challenging P‐Alkylation of Aromatic Phosphorus Heterocycles and Follow‐Up Reactions

ChemistryEurope, EarlyView.
P‐alkylation of λ3σ2‐phosphinines is hindered by weak nucleophilicity and scarce synthetic access, previously requiring multistep routes or extreme electrophiles. A direct ambient‐condition method is reported using 3,5‐bis(trimethylsilyl)‐phosphinine/B(C6F5)3 with esters or iso(thio)cyanates to generate stable 1‐R‐phosphininium salts.
Samantha Frank, Ádám Horváth, Duy Nguyen, Moritz J. Ernst, Simon Steinhauer, Zoltán Benkő, Christian Müller   +6 more
wiley   +1 more source

Asymmetric Conjugate Hydrocyanation of α,β-Unsaturated Aldehydes Catalyzed by Engineered 2-Deoxy-D-ribose-5-phosphate Aldolase. [PDF]

Chemistry
The power of catalytic promiscuity: The enantioselective conjugate hydrocyanation of enals remains a long‐standing challenge for biocatalysis. Here, we report the redesign of 2‐deoxy‐D‐ribose‐5‐phosphate aldolase for the asymmetric conjugate hydrocyanation of aromatic enals, expanding the reaction scope of iminium‐based enzyme catalysis to include an ...
Zhou H, Fodran P, Fu H, Poelarends GJ.
europepmc   +2 more sources

Crystal structure of (3aS,4S,5R)-4-trimethylsilyl-3a,4,5,6-tetrahydro-3H- 1,2,10b-triaza-benzo[i]azulen-5-ol, C14H21N3OSi [PDF]

, 2001
Richard Ducray, L. Grosvalet, Marco A. Ciufolini, Μ. Perrin   +3 more
openalex   +1 more source

Shedding Light on Synthetic Autocatalysis: From Conventional Closed‐Shell Chemistries to Overlooked Open‐Shell Occurrences

Chemistry – A European Journal, EarlyView.
Why add another catalyst when the product itself holds the power to catalyze its own formation? Autocatalysis in synthetic chemistry enhances reaction efficiency and uncovers novel catalytic behavior across both closed‐shell and open‐shell systems, expanding reactivity and enabling innovative design strategies.
Jaspreet Kaur, Joshua P. Barham
wiley   +1 more source