Visible-light mediated directed perfluoroalkylation of hydrazones

2017 ◽  
Vol 15 (28) ◽  
pp. 6014-6023 ◽  
Author(s):  
Heng Ji ◽  
Hui-qiong Ni ◽  
Peng Zhi ◽  
Zi-wei Xi ◽  
Wei Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Aromatic Aldehyde ◽  
Aliphatic Aldehyde

A convenient and efficient protocol was reported to access a series of perfluoroalkylated aromatic aldehyde hydrazones. Aliphatic aldehyde hydrazones and N-monosubstituted hydrazones which are unreactive in previously reported hydrazone perfluoroalkylation reactions now take part in the reaction.

Chemoselective and repetitive intermolecular cross-acyloin condensation reactions between a variety of aromatic and aliphatic aldehydes using a robust N-heterocyclic carbene catalyst

2014 ◽  
Vol 12 (10) ◽  
pp. 1547-1550 ◽  
Author(s):  
Ming Yu Jin ◽  
Sun Min Kim ◽  
Hui Mao ◽  
Do Hyun Ryu ◽  
Choong Eui Song ◽  
...  
Keyword(s):  
Aromatic Aldehyde ◽  
Aliphatic Aldehyde ◽  
Aliphatic Aldehydes ◽  
Condensation Reactions

Chemoselectivity of the crossed acyloin product is controlled by the adjustment of the aromatic aldehyde/aliphatic aldehyde ratio.

The reaction of O-benzoyl aromatic aldehyde cyanohydrin with aliphatic aldehyde

1975 ◽  
Vol 16 (11) ◽  
pp. 903-906 ◽  
Author(s):  
Masatomo Hamana ◽  
Toshiyasu Endo ◽  
Seitaro Saeki
Keyword(s):  
Aromatic Aldehyde ◽  
Aliphatic Aldehyde

Studies of metaphase chromosomes in the scanning transmission x-ray microscope: Image fidelity, radiation damage and specimen preparation

1992 ◽  
Vol 50 (2) ◽  
pp. 1038-1039
Author(s):  
Shawn Williams ◽  
Xiaodong Zhang ◽  
Susan Lamm ◽  
Jack Van’t Hof
Keyword(s):  
Visible Light ◽  
Radiation Damage ◽  
Cross Section ◽  
Imaging Techniques ◽  
Dose Range ◽  
Specimen Preparation ◽  
X Rays ◽  
Metaphase Chromosomes ◽  
X Ray ◽  
Scanning Transmission

The Scanning Transmission X-ray Microscope (STXM) is well suited for investigating metaphase chromosome structure. The absorption cross-section of soft x-rays having energies between the carbon and oxygen K edges (284 - 531 eV) is 6 - 9.5 times greater for organic specimens than for water, which permits one to examine unstained, wet biological specimens with resolution superior to that attainable using visible light. The attenuation length of the x-rays is suitable for imaging micron thick specimens without sectioning. This large difference in cross-section yields good specimen contrast, so that fewer soft x-rays than electrons are required to image wet biological specimens at a given resolution. But most imaging techniques delivering better resolution than visible light produce radiation damage. Soft x-rays are known to be very effective in damaging biological specimens. The STXM is constructed to minimize specimen dose, but it is important to measure the actual damage induced as a function of dose in order to determine the dose range within which radiation damage does not compromise image quality.

Scanning luminescence x-ray microscopy: Progress toward selective staining using microspheres

1994 ◽  
Vol 52 ◽  
pp. 74-75
Author(s):  
C. Jacobsen ◽  
J. Fu ◽  
S. Mayer ◽  
Y. Wang ◽  
S. Williams
Keyword(s):  
Visible Light ◽  
Active Sites ◽  
Light Emission ◽  
Chinese Hamster ◽  
Polystyrene Spheres ◽  
Good Resistance ◽  
X Ray ◽  
Selective Staining ◽  
Visible Light Emission ◽  
Specific Labelling

In scanning luminescence x-ray microscopy (SLXM), a high resolution x-ray probe is used to excite visible light emission (see Figs. 1 and 2). The technique has been developed with a goal of localizing dye-tagged biochemically active sites and structures at 50 nm resolution in thick, hydrated biological specimens. Following our initial efforts, Moronne et al. have begun to develop probes based on biotinylated terbium; we report here our progress towards using microspheres for tagging.Our initial experiments with microspheres were based on commercially-available carboxyl latex spheres which emitted ~ 5 visible light photons per x-ray absorbed, and which showed good resistance to bleaching under x-ray irradiation. Other work (such as that by Guo et al.) has shown that such spheres can be used for a variety of specific labelling applications. Our first efforts have been aimed at labelling ƒ actin in Chinese hamster ovarian (CHO) cells. By using a detergent/fixative protocol to load spheres into cells with permeabilized membranes and preserved morphology, we have succeeded in using commercial dye-loaded, spreptavidin-coated 0.03μm polystyrene spheres linked to biotin phalloidon to label f actin (see Fig. 3).

Photocatalyst-free decarboxylative aminoalkylation of imidazo[1,2-a]pyridines with N-aryl glycines enabled by visible light

2019 ◽  
Vol 6 (21) ◽  
pp. 3693-3697 ◽  
Author(s):  
Jiu-Jian Ji ◽  
Zhi-Qiang Zhu ◽  
Li-Jin Xiao ◽  
Dong Guo ◽  
Xiao Zhu ◽  
...  
Keyword(s):  
Visible Light

A novel, green and efficient visible-light-promoted decarboxylative aminoalkylation reaction of imidazo[1,2-a]pyridines with N-aryl glycines has been described.

Space Charge Formation by Irradiation of Visible Light in Polyimide under DC Electric Stress

2009 ◽  
Vol 129 (7) ◽  
pp. 463-469 ◽  
Author(s):  
Tomo Tadokoro ◽  
Takuo Motoyama ◽  
Hiroshi Harada ◽  
Yasuhiro Tanaka ◽  
Tastuo Takada ◽  
...  
Keyword(s):  
Visible Light ◽  
Space Charge ◽  
Charge Formation ◽  
Electric Stress
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