Investigation of the state of a symmetrical tert-butyl-substituted macroheterocyclic compound in solution by PMR spectroscopy

1981 ◽  
Vol 17 (1) ◽  
pp. 49-51
Author(s):  
V. F. Borodkin ◽  
V. A. Burmistrov ◽  
M. K. Islyaikin
Keyword(s):  
The State ◽  
Tert Butyl ◽  
Pmr Spectroscopy ◽  
Macroheterocyclic Compound

Synthesis of unsymmetrically substituted expanded hemiporphyrazines: A monoiodo functionalized hemihexaphyrazine

2020 ◽  
pp. A-D
Author(s):  
Yana E. Philippova ◽  
Mikhail K. Islyaikin ◽  
Tomas Torres
Keyword(s):  
Mass Spectrometry ◽  
Molar Ratio ◽  
Text Type ◽  
Tert Butyl ◽  
Maldi Tof Mass Spectrometry ◽  
Maldi Tof ◽  
Vis Spectroscopy ◽  
Macroheterocyclic Compound

A monoiododi(tert-butyl)substituted macroheterocyclic compound of ABAB[Formula: see text]AB[Formula: see text]-type 4 was obtained, as a mixture of regioisomers, by statistical condensation of 4-iodophthalonitrile, 4-tert-butylphthalonitrile and 2,5-diamino-1,3,4-thiadiazole in a molar ratio 1:2:3 respectively. The structure of the functionalized hemihexaphyrazine was confirmed by MALDI-TOF mass spectrometry, IR and UV-vis spectroscopy.

scholarly journals Synthesis and Cross-Linking Properties of Melamine Formaldehyde Oligomers with Peroxy Groups

2021 ◽  
Vol 15 (4) ◽  
pp. 512-519
Author(s):  
Olena Astakhova ◽  
◽  
Olena Shyshchak ◽  
Michael Bratychak ◽  
◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Process Time ◽  
Cross Linking ◽  
Melamine Formaldehyde ◽  
Butyl Hydroperoxide ◽  
Tert Butyl ◽  
Pmr Spectroscopy ◽  
Tert Butyl Hydroperoxide ◽  
The Cross

Melamine formaldehyde oligomers with peroxy groups (MFOP) have been synthesized based on melamine or urea and melamine in the presence of tert-butyl peroxymethanol or tert-butyl hydroperoxide. Zinc oxide was used as a catalyst. The effect of peroxide nature, ratio of the starting components and process time on the characteristics and yield of MFOP has been studied. The structure of the synthesized MFOP was confirmed by IR- and PMR-spectroscopy. The chemistry of the cross-linked structures formation was studied. The possibility of using such oligomers as a cross-linking agent for the mixtures based on TGM-3 oligoesteracrylate is shown.

Practical Picture Processing

1974 ◽  
Vol 32 ◽  
pp. 338-339
Author(s):  
T. A. Welton
Keyword(s):  
Radiation Damage ◽  
Coherence Length ◽  
Spatial Information ◽  
State Of The Art ◽  
Coherent Radiation ◽  
The State ◽  
Energy Spread ◽  
Electron Micrograph ◽  
Picture Processing ◽  
Molecular Skeleton

Various authors have emphasized the spatial information resident in an electron micrograph taken with adequately coherent radiation. In view of the completion of at least one such instrument, this opportunity is taken to summarize the state of the art of processing such micrographs. We use the usual symbols for the aberration coefficients, and supplement these with £ and 6 for the transverse coherence length and the fractional energy spread respectively. He also assume a weak, biologically interesting sample, with principal interest lying in the molecular skeleton remaining after obvious hydrogen loss and other radiation damage has occurred.

Sign in / Sign up

Export Citation Format

Share Document