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Articles by Daniel Gomez Seidel
Thieme E-Journals - Synlett
Buy Article Permissions and Reprints All articles of this category Due to the relative instability and low electrophilicity of enolizable alicyclic imines, their functionalization commonly requires cryogenic temperatures and highly reactive nucleophiles such as organolithium compounds. Stable BF3 adducts of these imines streamline the synthesis of functionalized amines and obviate the need for cryogenic temperatures. In favorable cases, these adducts can be stored for over a year.
Catalytic Enantioselective Synthesis of 2-Pyrazolines via One-Pot Condensation/6π-Electrocyclization: 3,5-Bis(Pentafluorosulfanyl)-phenylthioureas as Powerful Hydrogen Bond Donors
Catalytic Enantioselective Synthesis of 2-Pyrazolines via One-Pot Condensation/6π-Electrocyclization: 3,5-Bis(Pentafluorosulfanyl)-phenylthioureas as Powerful Hydrogen Bond Donors A new conjugate-base-stabilized carboxylic acid (CBSCA) containing a 3,5-bis(pentafluorosulfanyl)phenylthiourea functionality catalyses challenging one-pot condensations/6π-electrocyclizations of hydrazines and α,β-unsaturated ketones under mild conditions.
Wie wir mit nur 200 Euro ein Raumfahrt-Unternehmen gegründet haben
Was LiveEO macht, ist fast buchstäblich Raketentechnik. Zumindest etwas, das zum Teil weit draußen im All stattfindet und zum anderen Teil tief drin in den Algorithmen Künstlicher Intelligenz. Konkret: LiveEO wertet Satellitendaten aus und leitet nutzbare Erkenntnisse für unterschiedliche Kunden daraus ab. Ein Kunde beispielsweise ist die Deutsche Bahn, die ihr Schienennetz so nach Problemen absuchen kann. Oder aber die Betreiber von Stromnetzen.
Planning to innovate in 2024? Here’s what you should be thinking about
By Daniel Gomez Seidel, managing director for the New York-based transformation firm, inplural, and former innovation leader at Capital One Bank. Whether you have been at the helm of a well-funded fintech startup, working inside an established bank, or part of a global conglomerate, you probably have felt that the times we are living in are disruptive, exciting, and perhaps also a bit scary.
Wie wir mit nur 200 Euro ein Raumfahrt-Unternehmen gegründet haben
Was LiveEO macht, ist fast buchstäblich Raketentechnik. Zumindest etwas, das zum Teil weit draußen im All stattfindet und zum anderen Teil tief drin in den Algorithmen Künstlicher Intelligenz. Konkret: LiveEO wertet Satellitendaten aus und leitet nutzbare Erkenntnisse für unterschiedliche Kunden daraus ab. Ein Kunde beispielsweise ist die Deutsche Bahn, die ihr Schienennetz so nach Problemen absuchen kann. Oder aber die Betreiber von Stromnetzen.
Alternating styrene-propylene and styrene-ethylene copolymers prepared by photocatalytic decarboxylation
Alternating styrene–propylene and styrene–ethylene copolymers prepared by photocatalytic decarboxylation† Synthesis of olefin–styrene copolymers with defined architecture is challenging due to the limitations associated with the inherent reactivity ratios for these monomers in radical or metal-catalyzed polymerizations.
Photocatalytic Direct Decarboxylation of Carboxylic Acids to Derivatize or Degrade Polymers
Abstract Visible light-driven direct decarboxylation of carboxylic acid side chains in macromolecules was explored as a robust post-polymerization modification strategy. Multiple transformations of copolymers were achieved, including derivatization with olefin units, functionalization with pendent alkenes, and backbone degradation. These decarboxylative processes were rapid, selective, and displayed high atom economy.
Diversification of Unprotected Alicyclic Amines by C−H Bond Functionalization: Decarboxylative Alkylation of Transient Imines
Communication Dr. Jae Hyun Kim Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, FL, 32611 USA Current address: College of Pharmacy, Kangwon National University, Chuncheon, 24341 Republic of Korea These authors contributed equally to this work.
Rapid functionalization of multiple C-H bonds in unprotected alicyclic amines
Abstract The synthesis of valuable bioactive alicyclic amines containing variable substituents in multiple ring positions typically relies on multistep synthetic sequences that frequently require the introduction and subsequent removal of undesirable protecting groups.
α-Functionalization of Cyclic Secondary Amines: Lewis Acid Promoted Addition of Organometallics to Transient Imines
Cyclic imines, generated in situ from their corresponding N-lithiated amines and a ketone hydride acceptor, undergo reactions with a range of organometallic nucleophiles to generate α-functionalized amines in a single operation.
Recording & Phase Alignment für Saiteninstrumente
Hallo zusammen , was haltet ihr von diesem Tutorial zum Thema Aufnahme und Phase Alignment für Kontrabässe? Würdet ihr gerne mehr von dieser Art sehen, vielleicht auch mit anderen Instrumenten / Gitarren etc. ?
Catalytic Enantioselective Synthesis of Mariline A and Related Isoindolinones via a Biomimetic Approach
The catalytic enantioselective synthesis of isoindolinones was achieved via the condensation of ortho-formyl-arylketones and anilines. In the presence of 1 mol% of a chiral phosphoric acid catalyst, reactions reach completion within 10 minutes and provide products with up to 98% ee. Anilines with an ortho t-butyl group form atropisomeric products, enabling the simultaneous generation of axial and point chirality from two achiral substrates.
Asymmetric Brønsted acid catalysis with chiral carboxylic acids
Chiral Brønsted acids have found widespread applications as organocatalysts. Weakly acidic species such as diols and (thio)ureas, typically classified as hydrogen bonding catalysts, as well as stronger phosphoric acids, have proven to be highly effective in catalyzing a wide range of asymmetric transformations. In contrast, the use of chiral carboxylic acids as Brønsted acid catalysts is much less developed but has recently garnered increased attention.
Direct Formation of Oxocarbenium Ions under Weakly Acidic Conditions: Catalytic Enantioselective Oxa-Pictet-Spengler Reactions
Two catalysts, an amine HCl salt and a bisthiourea, work in concert to enable the generation of oxocarbenium ions under mild conditions. The amine catalyst generates an iminium ion of sufficient electrophilicity to enable 1,2-attack by an alcohol. Catalyst turnover is achieved by amine elimination with concomitant formation of an oxocarbenium intermediate. The bisthiourea catalyst accelerates all of the steps of the reaction and controls the stereoselectivity via anion binding/ion pair formation.
Beyond Fun: The Vital Future Of Wearables
Remember life before high-speed Internet, or when having a smartphone was considered a luxury? Every few years, a new technology comes along, gains enough traction to become its own category, and has the potential to change how we live. Enter wearables. Some expect wearable devices to repeat the growth pattern of smartphones. The category has increased its global market value by over 1,000% since 2012.
Beyond Fun: The Vital Future Of Wearables
Remember life before high-speed Internet, or when having a smartphone was considered a luxury? Every few years, a new technology comes along, gains enough traction to become its own category, and has the potential to change how we live. Enter wearables. Some expect wearable devices to repeat the growth pattern of smartphones. The category has increased its global market value by over 1,000% since 2012.
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