Cyanomethyl anion transfer reagents for diastereoselective Corey–Chaykovsky cyclopropanation reactions

2018 ◽  
Vol 54 (81) ◽  
pp. 11439-11442 ◽  
Author(s):  
Renè Hommelsheim ◽  
Katharina J. Hock ◽  
Christian Schumacher ◽  
Mohanad A. Hussein ◽  
Thanh V. Nguyen ◽  
...  
Keyword(s):  
Sulfonium Salt ◽  
Anion Transfer

A readily available sulfonium salt opens up new synthetic pathways to access nitrile cyclopropanes in a highly diastereoselective fashion.

Polarizability and nonpolarizability of oil-water interfaces with relevance to a.c. impendance measurements

1991 ◽  
Vol 56 (1) ◽  
pp. 112-129 ◽  
Author(s):  
Takashi Kakiuchi ◽  
Mitsugi Senda
Keyword(s):  
Charge Transfer ◽  
Numerical Calculation ◽  
Supporting Electrolyte ◽  
Water Interface ◽  
Migration Effect ◽  
Ac Current ◽  
Stationary Interface ◽  
Oil Water ◽  
Anion Transfer

We have estimated the degree of polarizability of a polarized oil-water interface used as a working interface and that of the nonpolarizability of a nonpolarized interface used as a reference oil-water interface from the numerical calculation of dc and ac current vs potential behavior at both interfaces. Theoretical equations of dc and ac currents for simultaneous cation and anion transfer of supporting electrolytes have been derived for the planar stationary interface for reversible and quasi-reversible cases. In the derivation, the migration effect and the coupling of the cation and anion transfer have been incorporated. The transfer of ions constituting a supporting electrolyte contributes to the total admittance of the interface even in the region where the interface may be considered as polarized in dc sense, as pointed out first by Samec et al. (J. Electroanal. Chem. 126, 121 (1981)). Moreover, the reference oil-water interface is not ideally reversible, so that the contribution from this interface to the measured admittance cannot be negligible, unless the area of the reference oil-water interface is much larger than that of the working oil-water interface. The effect of non-ideality of the reference oil-water interface on the determination of double layer capacitances and kinetic parameters of charge transfer at the working oil-water interface has been estimated.

One/two-Photon Sensitive Sulfonium Salt Photoinitiators based on 1,3,5-Triphenyl-2-Pyrazoline

2021 ◽  
pp. 110525
Author(s):  
Shixiong Chen ◽  
Chun Cao ◽  
Xiaoming Shen ◽  
Yiwei Qiu ◽  
Cuifang Kuang ◽  
...  
Keyword(s):  
Sulfonium Salt ◽  
Two Photon

Unsymmetrical Organotrisulfide Formation via Low-Temperature Disulfanyl Anion Transfer to an Organothiosulfonate

2019 ◽  
Vol 84 (5) ◽  
pp. 2862-2869 ◽  
Author(s):  
Doaa Ali ◽  
Roger Hunter ◽  
Catherine H. Kaschula ◽  
Stephen De Doncker ◽  
Sophie C. M. Rees-Jones
Keyword(s):  
Low Temperature ◽  
Anion Transfer

Gold(iii) assisted C–H activation of 1,4,7-trithiacyclononane: synthesis and spontaneous resolution of a bicyclic chiral sulfonium salt

2014 ◽  
Vol 43 (9) ◽  
pp. 3424-3427
Author(s):  
D. E. Janzen ◽  
A. M. Kooyman
Keyword(s):  
Thermal Reaction ◽  
Spontaneous Resolution ◽  
Sulfonium Salt ◽  
Ligand Complex

A trithiamacrocyclic ligand complex of Au(iii) undergoes a redox-mediated thermal reaction to form a chiral bicyclic sulfonium salt.

Primäre und sekundäre Ethyl-und i-Propylsulfoniumsalze sowie Kristallstruktur von i-C3H7SH2+SbF6- [1]

1996 ◽  
Vol 51 (2) ◽  
pp. 277-285
Author(s):  
Rolf Minkwitz ◽  
Ulrike Lohmann ◽  
Hans Preut
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Bond Distance ◽  
Crystal Structure Analysis ◽  
Unit Cell ◽  
Monoclinic Space Group ◽  
Spectroscopic Methods ◽  
Sulfonium Salt ◽  
Space Group

Abstract The synthesis of salts of the type RnSH3-n+MF6- (R = C2H5, i-C3H7; n = 1, 2; M = As, Sb) by protonation of the corresponding thiols and sulfides in the superacid systems HF/MF5 is reported. The salts have been characterized by vibrational and NMR spectroscopic methods. Isopropylsulfonium hexafluoroantimonate is the first known example of a sulfonium salt, for which a SH bond distance has been determined by a crystal structure analysis, i-C3H7SH2+SbF6- crystallizes in the monoclinic space group P21/m with a = 568.0(4), b = 801.1(6), c = 1019.7(8) pm, β = 82.63(6) °, with two formula units per unit cell.

scholarly journals Pegylated and nanoparticle-conjugated sulfonium salt photo triggers necrotic cell death

2016 ◽  
Vol Volume 11 ◽  
pp. 6161-6168 ◽  
Author(s):  
Alaa A Fadhel ◽  
Xiling Yue ◽  
Ebrahim H Ghazvini Zadeh ◽  
Mykhailo Bondar ◽  
Kevin D Belfield
Keyword(s):  
Cell Death ◽  
Necrotic Cell Death ◽  
Necrotic Cell ◽  
Sulfonium Salt

Comparative physiology of insect renal function

1981 ◽  
Vol 241 (5) ◽  
pp. R241-R257 ◽  
Author(s):  
J. Phillips
Keyword(s):  
Surface Area ◽  
Total Surface Area ◽  
Malpighian Tubules ◽  
Thick Ascending Limb ◽  
Small Surface ◽  
Multiplier System ◽  
Wide Range ◽  
Glomerular Filtrate ◽  
Unit Body Weight ◽  
Anion Transfer

Transport mechanisms and their control in various segments of insect excretory systems are reviewed and compared to those of vertebrate nephrons, exocrine glands, and hindguts. Formation of the primary urine in most insect Malpighian tubules (MT) is by isosmotic secretion, which is driven by an apical cation (K+) pump rather than by Na+-K+-ATPase. Unlike the glomerular filtrate of vertebrates, insect MT fluid is very different from the blood in composition, often having very high K+-to-Na+ ratios, and urine-to-plasma values much less than unity for most other solutes. The total surface area of insect MT is some 20 times that of vertebrate glomeruli per unit body weight. Secretion of MT fluid is regulated by neuropeptides over a wide range of rats, similar to glomerular filtration rate values for many vertebrate kidneys. Several secretory mechanisms for selected solutes are probably common to insect and vertebrate tubules. Unlike vertebrates, insects usually reabsorb most of the filtered water, ions, and metabolites in the rectum, which has a small surface area relative to the MT. The rectum is also where ionic and osmotic composition of the excreta is finally adjusted, under the control of neuropeptide hormones. In the rectum, insect excreta can become as hyperosmotic as mammalian urine, even though a countercurrent multiplier system is not present. Active transport of Cl- predominates in both locust rectum and the thick ascending limb of Henle's loop, but the characteristics of the anion transfer process are quite different in these two epithelia.xs

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