Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 11 of 11 for “"Para positions"”.
-
Ring closure in the meta and para positions of the benzene ring: Structure of benzidine
Made available in DSpace on 2017-11-30T21:03:38Z (GMT). No. of bitstreams: 2 6534967.pdf: 9146206 bytes, checksum: a94e71d8a958ae15977ec0ed1bef11ad (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1922
-
A Chemical Pathway to the Formation of Chlorinated Compounds During Combustion
… be favored at higher temperatures. The ortho and para positions in the phenol ring are the favored sites for chlorine substitution.
-
Liquid Phase Carbon-Thirteen Dynamic Nuclear Polarization Study of Monosubstituted Aromatic Compounds
… the carbon-thirteen DNP enhancements at meta and para positions exhibits a reasonable correlation. A better correlation of carbon-thirteen DNP enhancements with the Hammett inductive factor was observed. A large scalar dominated enhancement at ipso (C-1) position was observed for iodobenzene. This …
-
The chemistry of some heterocyclic analogues of triphenylmethane dyes
… Where substitution occurs in the meta- and para- positions of the phenyl ring, the wavelength of maximum absorption bears a linear relationship to the appropriate Hammett substituent constant. Observed Xmax(x) values for disubstituted compounds are in good agreement with the values …
-
Computer-aided design and synthesis of 5,7-dihydroxyflavone derivatives as glycogen phosphorylase inhibitors
… and small hydrophobic groups on the meta/para positions directed towards the hydrophobic cavity of the binding site. Towards synthesis of these analogues, after many adjustments to the synthetic procedure it was identified that using methyl protection of the hydroxyls at the 5 and 7 …
-
Electronic absorption spectra of basic dyes containing terminal diethylamino and morpholino groups
… Where substitution occurs in the meta- and para-positions of the phenyl ring, it has been shown that the wavelength of maximum absorption bears a linear relationship to the appropriate Hammett substitution constant. Observed,\ max values for disubstituted compounds are in good agreement with …
-
Polyfluorinated Aromatic Systems for Liquid Crystal Display Applications
… electron–donating substituents in the meta– and para– positions, with respect to the C–B bond, are described. For example, Reaction of pentafluoronitrobenzene with 5,5–dimethyl–2–phenyl–1,3,2–dioxaborinane in the presence of catalytic quantities of Pd(PPh3)4 and using KF/alumina as the preferred …
-
Amphiphilic Spin Crossover Complexes
… alkylation of catechol, subsequent nitration in para-positions and reduction of the nitro functionalities resulting in the diamino compound. Further reactions with different keto-enol ethers gave the ready ligand that reacts with iron(II) acetate to iron(II) complexes with methanol in axial …
-
Preparation and properties of carbamates, nitrocarbamates and their derivatives
… introduction of a nitro group into the ortho and para positions of the benzene nucleus. When the ortho and para positions were blocked with methyl groups, as in the case of ethyl N-(2,4,6-trimethylphenyl) carbamate, nitration then took place in the meta position to yield ethyl …
-
Design, synthesis, and structure-activity relationship studies of dual Plasmodium falciparum phosphatidylinositol 4-kinase and cGMP-dependent protein kinase inhibitors
… the ever emergence and continuous spread of parasite resistance to available chemotherapeutics, threatens to undermine advances made thus far. In addition, the current portfolio of drugs is non-effective in addressing chemoprotection, transmission blockade and relapse in P. vivax and P. ovale …