Results 21 to 30 of about 3,998 (209)
Molbank, 2021 The intermolecular [2 + 2]-photocycloaddition of the parent flavone molecule (4) as the triplet energy-accepting species and the electron-rich alkene 2, 3-dihydrofuran (5) was performed by visible-light-mediated triplet-sensitization with an iridium ...
Jens Lefarth +2 more
doaj +1 more source
Characterization and Dynamics of Substituted Ruthenacyclobutanes Relevant to the Olefin Cross-Metathesis Reaction [PDF]
, 2011 The reaction of the phosphonium alkylidene [(H_(2)IMes)RuCl2═CHP(Cy)_3)]^(+) BF_(4)^− with propene, 1-butene, and 1-hexene at −45 °C affords various substituted, metathesis-active ruthenacycles. These metallacycles were found to equilibrate over extended
Blake, Garrett +3 more
core +2 more sources
Carbocations and the Complex Flavor and Bouquet of Wine: Mechanistic Aspects of Terpene Biosynthesis in Wine Grapes. [PDF]
, 2015 Computational chemistry approaches for studying the formation of terpenes/terpenoids in wines are presented, using five particular terpenes/terpenoids (1,8-cineole, α-ylangene, botrydial, rotundone, and the wine lactone), volatile compounds (or their ...
Pemberton, Ryan P +2 more
core +2 more sources
Molecules, 2022 The ditopic halogen-bond (X-bond) donors 1,2-, 1,3-, and 1,4-diiodotetrafluorobenzene (1,2-, 1,3-, and 1,4-di-I-tFb, respectively) form binary cocrystals with the unsymmetrical ditopic X-bond acceptor trans-1-(2-pyridyl)-2-(4-pyridyl)ethylene (2,4-bpe ...
Jay Quentin +2 more
doaj +1 more source
Synthesis of functionalized tryptamines by Brønsted acid catalysed cascade reactions [PDF]
, 2015 An original synthetic protocol has been developed for the preparation of highly functionalized tryptamines from 2-hydroxycyclobutanone and secondary arylamines via a solvent-free Brønsted acid catalysed two-step reaction ...
Aitken, David J +4 more
core +1 more source
(Poly)Borylated Species as Modern Reactive Groups toward Unusual Synthetic Applications
Angewandte Chemie, EarlyView.In this review, we spotlight recent breakthroughs in α‐polyboron‐substituted carbon‐centered intermediates (carbanion, carbocation, radical, and carbene) and polyborylated alkenes. By bridging fundamental reactivity with the application potential of these extraordinary species, we hope this review will serve as a roadmap for harnessing these unique ...
Nadim Eghbarieh +5 more
wiley +2 more sources
Vinylene-Linked Covalent Organic Frameworks by Base-Catalyzed Aldol Condensation [PDF]
, 2019 Two 2D covalent organic frameworks (COFs) linked by vinylene (−CH=CH−) groups (V‐COF‐1 and V‐COF‐2) are synthesized by exploiting the electron deficient nature of the aromatic s‐triazine unit of C3‐symmetric 2,4,6‐trimethyl‐s‐triazine (TMT).
Acharjya, Amitava +4 more
core +1 more source
Mechanically Triggered Chemical Recyclable Polyethylene‐Like Materials
Angewandte Chemie, EarlyView.Polyethylene‐like copolymers with benchmark properties are prepared by embedding latent cyclobutene mechanophores to overcome PE's end‐of‐life limits. The mechanophores are inert in service but are selectively opened by solvent‐free ball milling to yield well‐defined telechelic oligomers.
Menghe Xu +3 more
wiley +2 more sources
Cyclopropyl and cyclobutylboronates and silanes: A stereoselective approach [PDF]
, 2018 Chiral cyclopropyl- and cyclobutylboronic esters and -silanes have become attractive intermediates for the preparation of functionalized small rings.
Martín-Heras, Víctor +2 more
core +1 more source
Ring Tension, Hydrocarbon Acidity, and New «Super-Bases»
CHIMIA, 1986 Addition of disodium pinacolate or, particularly, potassium tert-butoxide considerably increases the transmetalating power of pentylsodium. A hexane slurry of such «NACNAOR» or «NACKOR» reagent mixtures readily and selectively converts 3,3-dimenthyl-1 ...
Manfred Schlosser +5 more
doaj +1 more source