A practical method for the generation of organoarsenic nucleophiles towards the construction of a versatile arsenic library

2016 ◽  
Vol 45 (19) ◽  
pp. 7937-7940 ◽  
Author(s):  
Susumu Tanaka ◽  
Hiroaki Imoto ◽  
Takuji Kato ◽  
Kensuke Naka
Keyword(s):  
Present Method ◽  
Bond Formation ◽  
Practical Method ◽  
Promising Ligand

Organoarsenic nucleophiles were easily and safely prepared, leading to a practical method for As–C bond formation. Promising ligand structures such as asymmetric and bidentate types can be widely constructed by the present method.

scholarly journals Catalytic Three-component C–C Bond Forming Dearomatization of Bromoarenes with Malonates and Diazo Compounds

2020 ◽  
Author(s):  
Hiroki Kato ◽  
Itsuki Musha ◽  
Masaaki Komatsuda ◽  
Kei Muto ◽  
Junichiro Yamaguchi
Keyword(s):  
Present Method ◽  
Bond Formation ◽  
Diazo Compounds ◽  
Bond Forming ◽  
Rapid Access ◽  
Component C

A Pd-catalyzed dearomative three-component C–C bond formation of bromoarenes with diazo compounds and malonates was developed. Various bromoarenes ranging from benzenoids to azines and heteroles were transformed to the corresponding substituted alicyclic molecules. The key of this reaction is the generation of a benzyl-palladium intermediate, which reacts with malonates to form a Pd–<i>O</i>-enolate species. Strikingly, the present method enabled rapid access to multi-substituted alicycles through subsequent elaboration of dearomatized products.

Metal-free enaminone C-N bond cyanation for stereoselective synthesis of (E)- and (Z)-β-cyano enones

2021 ◽  
Author(s):  
Ting Liu ◽  
Jie-Ping Wan ◽  
Yunyun Liu
Keyword(s):  
Stereoselective Synthesis ◽  
Bond Cleavage ◽  
Bond Formation ◽  
Practical Method ◽  
Efficient Synthesis ◽  
Metal Free

A highly practical method for C-CN bond formation by C-N bond cleavage on enaminones leading to the efficient synthesis of β-cyano enones is developed. The reactions take place efficiently to...

On a Table for the Formation of Logarithms and Anti-Logarithms to Twelve Places

1865 ◽  
Vol 12 (2) ◽  
pp. 71-100
Author(s):  
Peter Gray
Keyword(s):  
Present Method ◽  
Practical Method ◽  
Peculiar Form ◽  
Limited Scale ◽  
The Given

With the exception of the publication on a more limited scale (and which will be hereafter referred to), of that which is now to be developed, there exists at present no ready and practical method of forming to more than seven places the logarithms of numbers of more than seven or eight figures. The great extent of the tables requisite, if formed on the plan of our present seven-figure tables, is not only likely ever to prove a bar to their construction, but it would also render them too cumbrous, if constructed, to be easily and readily used. In the present method, the end in view is sought to be attained in another way. The principle of the method is the resolution of the number whose logarithm is required, by a direct and easy process, into factors of a peculiar form, the logarithms of which, to the requisite extent, admit of easy tabulation. The logarithms of the factors, then, being taken from the table, their sum is the logarithm of the given number.

A route to access imidazol[1,5-a]indole-1,3-diones and pyrrolo[1,2-c]imidazole-1,3-diones

2019 ◽  
Vol 17 (36) ◽  
pp. 8384-8390 ◽  
Author(s):  
Ramana Sreenivasa Rao ◽  
Femil Joseph Shajan ◽  
D. Srinivasa Reddy
Keyword(s):  
Column Chromatography ◽  
Present Method ◽  
Practical Method ◽  
Work Up

A simple and practical method for synthesizing imidazol[1,5-a]indoles and pyrrolo[1,2-c]imidazoles has been developed. The present method uses microwave conditions and is free from the need for work-up and column chromatography.

scholarly journals Catalytic Three-component C–C Bond Forming Dearomatization of Bromoarenes with Malonates and Diazo Compounds

2020 ◽  
Author(s):  
Hiroki Kato ◽  
Itsuki Musha ◽  
Masaaki Komatsuda ◽  
Kei Muto ◽  
Junichiro Yamaguchi
Keyword(s):  
Present Method ◽  
Bond Formation ◽  
Diazo Compounds ◽  
Bond Forming ◽  
Rapid Access ◽  
Component C

A Pd-catalyzed dearomative three-component C–C bond formation of bromoarenes with diazo compounds and malonates was developed. Various bromoarenes ranging from benzenoids to azines and heteroles were transformed to the corresponding substituted alicyclic molecules. The key of this reaction is the generation of a benzyl-palladium intermediate, which reacts with malonates to form a Pd–<i>O</i>-enolate species. Strikingly, the present method enabled rapid access to multi-substituted alicycles through subsequent elaboration of dearomatized products.

A Practical Method for Functionalized Peptide or Amide Bond Formation in Aqueous−Ethanol Media with EDC as Activator†

2009 ◽  
Vol 13 (2) ◽  
pp. 310-314 ◽  
Author(s):  
Yangwei John Pu ◽  
Radhe K. Vaid ◽  
Sathish K. Boini ◽  
Robert W. Towsley ◽  
Christopher W. Doecke ◽  
...  
Keyword(s):  
Aqueous Ethanol ◽  
Bond Formation ◽  
Practical Method ◽  
Amide Bond ◽  
Amide Bond Formation

The Quasi-Three Dimensional Design Method for Steam Turbines With Curvilinear Leaned and Twisted Stator Blades

1992 ◽  
Author(s):  
Zhongqi Wang ◽  
Fengjun Liu
Keyword(s):  
Steam Turbine ◽  
Engineering Design ◽  
Present Method ◽  
Design Method ◽  
Three Dimensional ◽  
Prediction Method ◽  
Practical Method ◽  
Steam Turbines ◽  
Calculating Method

A quasi–three dimensional calculating method for steam turbines with curvilinear leaned and twisted stator blades is given in this paper. A 300 MW steam turbine throughflow designs of the last stages with conventional twisted and curvilinear leaned–twisted blades are calculated respectively. Results of the calculation show that the present method is an improvement on the traditional prediction method and a practical method in the engineering design for steam turbines.

scholarly journals Ni-Electrocatalytic C(sp3)–C(sp3) Doubly Decarboxylative Coupling

2021 ◽  
Author(s):  
benxiang zhang ◽  
yang gao ◽  
yuta hioki ◽  
martins oderinde ◽  
jennifer qiao ◽  
...  
Keyword(s):  
Organic Synthesis ◽  
Present Method ◽  
Bond Formation ◽  
Amide Bond ◽  
Bond Forming ◽  
Amide Bond Formation ◽  
Redox Active ◽  
Decarboxylative Coupling ◽  
The 19Th Century

This work presents a modern spin on one of the oldest known Csp3–Csp3 bond forming reactions in synthetic chemistry: the Kolbe electrolysis. This reaction holds incredible promise for synthesis, yet its use has been near non-existent in mainstream organic synthesis. In contrast to the strongly oxidative electrolytic protocol employed traditionally since the 19th century, the present method utilizes in situ generated redox-active esters (RAEs) which are combined with a mildly reductive Ni-electrocatalytic cycle. It can be used to heterocouple 1o, 2o, and even certain 3o RAEs with a protocol reminiscent of amide bond formation in terms of simplicity. Due to its mild nature the reaction tolerates a range of functional groups, is scalable, and was strategically enlisted for the synthesis of 25 known compounds to reduce overall step-counts by 74%.

One-pot C–C/C–O bond formation: synthesis of spirocyclic lactones

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 837-843 ◽  
Author(s):  
Pedireddi Niharika ◽  
Gedu Satyanarayana
Keyword(s):  
Bond Formation ◽  
Practical Method ◽  
One Pot

An efficient and practical method for the synthesis of novel spiro(tri or tetra)cyclic lactones via the formation of C–C and C–O bonds in one-pot is presented.

The role of differential phase contrast in electron microscopy

1978 ◽  
Vol 36 (1) ◽  
pp. 176-177
Author(s):  
E.M. Waddell ◽  
J.N. Chapman ◽  
R.P. Ferrier
Keyword(s):  
Phase Contrast ◽  
Practical Method ◽  
Position Vector ◽  
Differential Phase ◽  
Pure Phase ◽  
Differential Phase Contrast ◽  
The Difference ◽  
Image Position ◽  
First Moment

Dekkers and de Lang (1977) have discussed a practical method of realising differential phase contrast in a STEM. The method involves taking the difference signal from two semi-circular detectors placed symmetrically about the optic axis and subtending the same angle (2α) at the specimen as that of the cone of illumination. Such a system, or an obvious generalisation of it, namely a quadrant detector, has the characteristic of responding to the gradient of the phase of the specimen transmittance. In this paper we shall compare the performance of this type of system with that of a first moment detector (Waddell et al.1977).For a first moment detector the response function R(k) is of the form R(k) = ck where c is a constant, k is a position vector in the detector plane and the vector nature of R(k)indicates that two signals are produced. This type of system would produce an image signal given bywhere the specimen transmittance is given by a (r) exp (iϕ (r), r is a position vector in object space, ro the position of the probe, ⊛ represents a convolution integral and it has been assumed that we have a coherent probe, with a complex disturbance of the form b(r-ro) exp (iζ (r-ro)). Thus the image signal for a pure phase object imaged in a STEM using a first moment detector is b2 ⊛ ▽ø. Note that this puts no restrictions on the magnitude of the variation of the phase function, but does assume an infinite detector.

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