A mild and efficient method for the synthesis of 6-(trifluoromethyl)phenanthridines through oxidative cyclization 2-isocyanobiphenyls with CF3SiMe3 under metal-free conditions was developed. The reaction allows direct formation C-CF3 bonds rapid access to phenanthridine ring systems in one catalytic cycle.

Irradiation of hydrazines and 2-isocyanobiphenyls with visible-light in the presence organic dye eosin B generates various 6-substituted phenanthridines good yields.

Abstract A visible‐light induced radical reaction of vinyl azides and α‐carbonyl benzyl bromides was developed, which provides an efficient route to polysubstituted quinolines via a CC CN bond formation sequence. magnified image

Although synthetic organic electrochemistry (EC) has advanced significantly, net redox neutral electrosynthesis is quite rare. Two approaches have been employed to achieve this type of electrosynthesis. One relies on turnover the product by reactant in a chain mechanism. The other involves both oxidation anode and reduction cathode which radical cation or anion migrate between two electrodes. Herein, home-built electrochemistry/mass spectrometry (EC/MS) platform was used generate an...

We report a visible-light-promoted synthesis of substituted naphthalenes via [4 + 2] annulation amino-benzocyclobutenes with alkynes. Amino-benzocyclobutenes, which are conveniently synthesized by [2 cycloaddition arynes ketenes followed reductive amination, undergo regioselective opening the cyclobutenyl ring to reveal presumably distonic radical cation upon photooxidation an excited iridium complex. The undergoes terminal and internal alkynes as well diynes afford structurally diverse...

We report herein a 1,3-difunctionalization of cyclopropylamines that serve as π nucleophile in two-electron (2e) SN2-like ring opening pathway. N-Iodosuccinimide (NIS) or situ generated cyanogen iodide (ICN) is employed electrophilic iodinating reagents conjunction with TMSCN succinimide to furnish multiple pairs functional groups disposed 1,3-manner. This 2e manifold overcomes the constraint our previously reported 1e protocol demonstrated by successful activation monocyclic tertiary...

A cascade approach toward the tetracyclic core of akuammiline alkaloids which features high modularity and convergence is reported. Distinct substitution pattern can be readily introduced to by varying three building blocks with similar complexity. The critical event in a regio- stereoselective 1,2-shift enabled carbocation that sets up core.

In this work, high-quality SnO2 and Hf0.38Sn0.62O2 thin films were grown on c-plane sapphire substrates by pulsed laser deposition for a comparative study. The optical electrical tests show that Hf doping leads to significantly increased bandgap resistivity of the HfSnO2 alloy as compared SnO2. Then, SnO2- Hf0.38Sn0.62O2-based UV detectors fabricated compared. film-based detector exhibits an excellent performance. Its dark current is low 0.2 pA under 20 V, rise/decay response time short 69...

Heterostructures such as heterojunctions, quantum wells, and superlattices are core components of advanced optoelectronic devices. Herein, we attempted the first investigations on band alignment nonpolar m-plane oriented ZnO1−xSx/Mg0.4Zn0.6O heterojunctions by X-ray photoelectron spectroscopy. All were revealed to show a type-I alignment, valence offset (VBO; ΔEV) increased significantly, while conduction (ΔEC) decreased insignificantly with increasing S content in ZnO1−xSx layer....

To clarify environment of shallow ocean front propagation mechanism and characteristic low frequency sound signal, using the Finite Element Method (FEM), set up a little bit source under action water waveguide all field numerical model, model simulation analysis different nature oceanic front, gradient slant range influence law energy flow characteristics. The results show that, compared with case without low-frequency will significantly leak to sea bottom in area transition from warm cold...

Abstract In order to clarify the propagation mechanism and characteristics of low-frequency sound signals in shallow sea with elastic bottom, using Time-domain Finite Element Method (TDFEM), a time-domain numerical calculation model field full-waveguide under action point source is established. With this model, The influence seabed acoustic parameters’ topography’ changes on simulated analyzed. results show that when there shear wave effect seabed, waves will excite Scholte propagating...

We report here a three-component, Cu(I)-catalyzed hexadehydro-Diels–Alder (HDDA) benzyne 1,2-difunctionalization reaction. This protocol allowed the introduction of two different carbon-based substituents onto in situ-generated benzyne. These were terminal monoynes or diynes partnered with propargylic, benzylic, allylic chlorides. An example sequential HDDA reaction is demonstrated using product 1,3-diyne and propargylic halide, itself newly created precursor.

In order to clarify the influence of upslope seabed on low-frequency acoustic signal propagation characteristics, Time-domain Finite Element Method (TDFEM) was used establish time-domain numerical calculation model field in shallow sea under action point source, and characteristics horizontal were simulated compared with this model. The results show that simple positive wave surface components can be received water environment. Compared seabed, normal attenuation faster; amplitude waves is...

Abstract Visible‐light‐induced radical reaction of vinyl azides and α‐carbonyl benzyl bromides provides an efficient route to polysubstituted quinolines via a C—C C—N bond formation sequence.

The ocean front is closely related to the hydrologic environment and geographical characteristics of ocean. To accurately detect locate front, ray acoustic model used analyze physical aiming explore application prospect in telemetry. simulation results show that under influence frontal sea area transitioning from a warm water cold area, sound will deflect downward advance, increase contact times with seafloor, grazing angle when contacting seafloor. In line be deflected upward increasing...

The seafloor is an important boundary for the ocean acoustic field, and understanding properties of sediment a necessary prerequisite studying field. Currently, liquid commonly used in inversion low-frequency parameters. However, actual porous elastic medium composed solid framework pore water. Therefore, this article predicts sound velocity attenuation coefficient sediments using approximate fluid density theory derived from Biot's theory. results show that similar to seawater frequency...

To elucidate the temporal and spectral attributes of acoustic emissions arising from high-voltage insulation breakdown in submarine cables, experiments were conducted within an anechoic aquatic environment. A pulse was imparted to cable exhibiting defects through utilization a DC generator, ensuing signals meticulously recorded captured by broadband hydrophones. Comparative analyses temporal, spectral, time-frequency domains, encompassing acquired at various transmission reception distances....

In order to study the influence and characteristics of seamount on low frequency acoustic propagation in shallow sea, using Finite Element Method (FEM) set up a full-waveguide low-frequency simulation model discussing laws different propagation. The results show that law sound energy flow is obviously from before after seamount. with other conditions unchanged, decrease slope angle, loss less front seamount, diffusion slower tends be gentle crossing summit. With height, lost As volume...