Chemoselective acidic hydrolysis of sulfonamides with trifluoromethanesulfonic acid has been evaluated as a deprotection method and further extended to more complex synthetic applications. In contrast conventional troublesome sulfonamide hydrolysis, near-stoichiometric amount was found be sufficient bring about efficient various neutral or electron-deficient N-arylsulfonamides, whereas electron-rich substrates provided sulfonyl group migration products. The developed is fully selective for...

The low statistical probability factor of the rubrene emitter (<italic>f</italic> = 15.5 ± 3%) was determined to be prime TTA-UC efficiency-limiting factor.

Solid state NIR-to-visible photon upconversion (UC) mediated by triplet-triplet annihilation (TTA) is necessitated numerous practical applications. Yet, efficient TTA-UC remains a highly challenging task. In this work palladium phthalocyanine-sensitized NIR-to-vis solid UC films based on popular rubrene emitter are thoroughly studied with the primary focus revealing impact of t-butyl substitution in performance. The solution-processed were additionally doped small amount emissive singlet...

Efficient deep-blue naphthyridine-based TADF emitters featuring narrow-band-emission with low roll-off were designed by using the H-bonding and sterically controlled charge-transfer interactions.

Abstract Rapid reverse intersystem crossing (RISC) is one of the prime concerns for blue thermally activated delayed fluorescence (TADF) emitters, as it reduces triplet exciton population, root cause detrimental triplet‐mediated annihilation processes that accelerate device efficiency roll‐off and degradation. This work introduces a new concept to tailor RISC TADF emitters through their molecular geometry adaptation crystalline hosts bearing similar donor‐acceptor structure. A meticulously...

Molecular tweezers are open-ended, cavity-possessing U-shaped molecular architectures with high potential for various applications in supramolecular chemistry. Their covalent synthesis, however, is often tedious and the structures obtained lack structural responsiveness beyond limited conformational flexibility of scaffold. Herein we present a proof-of-concept study on design, assembly, transformations novel construct─a fully noncovalent tweezer. The tweezer was assembled from set four...

A hitherto unknown reactivity of a strained four-membered heterocycle, 1,2-oxazetidine, is reported. When reacted with organometallic compounds, this reagent provides electrophilic oxygen nitrogen-terminated two-carbon-atom tether. The synthetic versatility the products obtained was demonstrated in various transformations, leading to efficient synthesis six-, seven-, and eight-membered heterocyclic systems pharmaceutical importance.

The design and synthesis of new stimuli-responsive hydrogen-bonding monomers that display a diversity self-assembly pathways is central importance in supramolecular chemistry. Here we describe the aggregation properties simple, intrinsically C2-symmetric enantiopure bicyclic cavity compound bearing terminally unsubstituted ureidopyrimidinone fragment fused with pyrrole moiety different solvents absence presence C60 C70 guests. tetrameric cyclic aggregate selectively obtained chlorinated...

Medium-ring S,N-heterocycles can be easily accessed in a one-pot procedure using an eight-membered dimeric sulfenamide annulation reagent.

Peripheral linking of rubrene emitters is found to deliver enhanced TTA efficiency <italic>vs.</italic> core linking. This provides valuable insight for their rational modification towards improved NIR-to-vis photon upconversion in the solid state.

Catalyst-free addition of ketone enolate to non-activated multiple C-C bonds involves non-complementary reaction partners and typically requires super-basic conditions. On the other hand, highly aggregated or solvated enolates are not reactive enough undergo direct alkenes alkynes. Herein, we report a new anionic cascade for one-step assembly intriguing molecular scaffolds possessing contiguous six-, five-, four-membered rings, representing formal [2+2] enol-allene cycloaddition. Reaction...

An asymmetric carbazole-donor motif in a D–A–D type naphthyridine-based TADF emitter enables CT/LE state mixing, thus enhancing the RISC rate, shortening delayed fluorescence lifetime and reducing OLED efficiency roll-off.

A number of 6,7‐dihydroquinazolino[3,2‐ a ][1,5]benzodiazepin‐13(5 H )‐ones were prepared utilizing the coupling readily available 5‐acyl‐1,3,4,5‐tetrahydro‐2 ‐1,5‐benzodiazepin‐2‐ones with 2‐nitrobenzoyl chloride followed by reductive N‐heterocyclization. 3‐Methylsubstituted 1‐(2‐nitrobenzoyl)‐1,5‐benzodiazepinone derivatives did not cyclize under N‐heterocyclization conditions. The possible mechanism this heterocyclization was discussed, and it demonstrated that hydroxylamine intermediate...

A simple and efficient general approach to various tetracyclic 6,7-dihydroquinazolino[3,2a][1,5]benzodiazepin-13(5H)-ones has been demonstrated by reductive N-heterocyclization of 5alkyl-or benzoyl-1-(2-nitrobenzoyl)-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-2-ones.These 2nitrobenzoylamides were obtained acylation the starting 5-alkyl-or benzoyl-1,5benzodiazepin-2-ones with 2-nitrobenzoyl chloride.A theoretical understanding features reaction was provided means quantum chemical reactivity...

5-Substituted 7-methyl-6,7-dihydroquinazolino[3,2-a][[1,5]benzodiazepin-13(5H)-one derivatives were synthesized in a one-step sequential acylation-cyclization reaction with simple procedure from an appropriate 5-substituted 3-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepin-2-one and 2-sulfinylaminobenzoyl chlorides.The mechanism of the heterocyclization was studied by DFT method using B3LYP functional 6-31+G(d, p) basis set.

Abstract A synthetic method is presented for S−N bond formation starting from cheap and affordable materials. We show that (un)substituted N ‐protected cyclic eight‐membered C 2 ‐symmetric sulfenamides have been prepared in a few steps using this procedure. The utility of these ambipolar derivatives was demonstrated variety transformations affording different S,N ‐heterocyles pharmaceutical relevance one or two simple magnified image

Abstract Title compound (II) is introduced as a new, convenient and highly reactive electrophilic sulfur/nucleophilic nitrogen synthon for simple preparation of medium‐sized S,N‐heterocycles.

Abstract 1,2‐Oxazetidine reacts with organometallic compounds to provide electrophilic oxygen a nitrogen‐terminated two‐carbon‐atom tether.

1-Oxopropyl- and 1-(2-nitrobenzoyl)-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine derivatives bearing various substituents – acyl-, alkyl- nitroso groups, polycyclic imidazo[1,2-a][1,5]- quinazoline[3,2-a][1,5]benzodiazepines were synthesized, their influence on the development of narrow-leafed lupin (Lupinus angustifolius L.) was investigated. The tests performed under laboratory conditions, seeds variety VB Derliai germinated in Petri dishes. It determined that nitrobenzamides characterized by...

We report a straightforward method for creating large-area, microscale resolution patterns of functional amines on self-assembled monolayers by the photoinduced local acidification flat elastomeric stamp enriched with photoacid. The limited diffusivity photoactivated merocyanine acid in poly(dimethylsiloxane) (PDMS) enabled to confine efficient deprotection N-tert-butyloxycarbonyl amino group (N-Boc) line widths below 10 μm. experimental setup is very simple and built around conventional...