ChemInform Abstract: Domino Reaction of 3-Nitro-2-(trifluoromethyl)-2H-chromenes with 2-(1-Phenylalkylidene)malononitriles: Synthesis of Functionalized 6-(Trifluoromethyl)-6H-dibenzo[b,d]pyrans and a Rare Case of [1,5] Sigmatropic Shift of the Nitro Group

ChemInform ◽  
2014 ◽  
Vol 45 (11) ◽  
pp. no-no
Author(s):  
Vladislav Yu. Korotaev ◽  
Alexey Yu. Barkov ◽  
Vyacheslav Ya. Sosnovskikh
Keyword(s):  
Nitro Group ◽  
Rare Case ◽  
Domino Reaction ◽  
Sigmatropic Shift

scholarly journals Nitropyridines: Synthesis and reactions

2003 ◽  
Vol 75 (10) ◽  
pp. 1403-1415 ◽  
Author(s):  
J. M. Bakke
Keyword(s):  
Reaction Mechanism ◽  
Organic Solvent ◽  
Nitro Group ◽  
Sulfonic Acid ◽  
Electrophilic Aromatic Substitution ◽  
Aromatic Substitution ◽  
Substitution Method ◽  
Sigmatropic Shift ◽  
Oxidative Substitution ◽  
Substituted Pyridines

Reaction of pyridine and substituted pyridines with N2O5 in an organic solvent gives the N-nitropyridinium ion. When this is reacted with SO2/HSO3– in water, 3-nitropyridine is obtained (77 % yield). With substituted pyridines, the method gives good yields for 4-substituted and moderate yields for 3-substituted pyridines. The reaction mechanism is not an electrophilic aromatic substitution, but one in which the nitro group migrates from the 1-position to the 3-position by a [1,5 ] sigmatropic shift. From 4-aminopyridine, imi- dazo [4,5-c ] pyridines have been synthesized. From 3-nitropyridine, 5-nitropyridine-2-sulfonic acid is formed in a two-step reaction. From this, a series of 2-substituted-5-nitro-pyridines has been synthesized. 3-Nitropyridine and 4-substituted-3-nitropyridines have been substituted with ammonia and amines by the vicarious substitution method and by the oxidative substitution method in the position para to the nitro group. High regioselectivities and yields have been obtained in both cases to afford a series of 4-substituted-2-alkylamino-5-nitropyridines.

Identification of Pulmonary Deposits from a Sandpaper Worker: A Study by Electron Microscopy and X-Ray Microanalysis

1982 ◽  
Vol 40 ◽  
pp. 52-53
Author(s):  
S. K. Peng ◽  
M.A. Egy ◽  
J. K. Singh ◽  
M.B. Bishop
Keyword(s):  
Electron Microscopy ◽  
Environmental Pollution ◽  
Rare Case ◽  
Interstitial Fibrosis ◽  
X Ray ◽  
Documented Case ◽  
Etiologic Agents ◽  
Pulmonary Interstitial Fibrosis ◽  
Gold Miners ◽  
Pulmonary Changes

Electron microscopy and energy dispersive x-ray microanalysis (EDXA) are found to be very useful tools for identification of etiologic agents in pneumoconiosis or interstitial pulmonary disorders. Pulmonary interstitial fibrosis and granulomatosis are frequently associated with occupational and environmental pollution. Numerous reports of pneumoconiosis in various occupations such as coal and gold miners are presented in the literature. However, there is no known documented case of pulmonary changes in workers in the sandpaper industry. This study reports a rare case of pulmonary granulomatosis containing deposits from abrasives of sandpaper diagnosed by using EDXA.

Abstract #736: A Rare Case of an Ectopic Parathyroid Adenoma Mimicking a Parathyroid Carcinoma

2015 ◽  
Vol 21 ◽  
pp. 143
Author(s):  
Elizabeth Sanchez Rangel ◽  
Maria Moscoso Cordero ◽  
Vinuta Mohan ◽  
Tasneem Zahra
Keyword(s):  
Parathyroid Adenoma ◽  
Parathyroid Carcinoma ◽  
Rare Case ◽  
Ectopic Parathyroid Adenoma ◽  
Ectopic Parathyroid

Abstract #110: Hemorrhagic Subdiaphragmatic Bronchogenic Cyst Mimicking an Adrenal Tumor: a Rare Case

2015 ◽  
Vol 21 ◽  
pp. 6
Author(s):  
Roy Guinto ◽  
Michele Ledoux ◽  
Alicia Williams ◽  
Anthony Mark
Keyword(s):  
Rare Case ◽  
Adrenal Tumor ◽  
Bronchogenic Cyst

Abstract #830: Rare Case of Severe Hypercalcemia: Gauchers Disease

2016 ◽  
Vol 22 ◽  
pp. 176-177
Author(s):  
Sudhamshi Toom ◽  
Elizabeth Sedlis Singer
Keyword(s):  
Rare Case ◽  
Severe Hypercalcemia

Abstract #1155: Acute Neck Swelling: A Rare Case of Spontaneous Hemorrhage in Thyroid Nodule

2016 ◽  
Vol 22 ◽  
pp. 278
Author(s):  
Anne Bacal ◽  
Nour Batarseh ◽  
Erin Drever ◽  
Tahira Yasmeen
Keyword(s):  
Thyroid Nodule ◽  
Rare Case ◽  
Neck Swelling ◽  
Spontaneous Hemorrhage

Abstract #337: A Rare Case of Copper Deficiency and Celiac Disease

2006 ◽  
Vol 12 ◽  
pp. 96-97
Author(s):  
Mihaela Cosma ◽  
Daniel L. Hurley
Keyword(s):  
Celiac Disease ◽  
Rare Case ◽  
Copper Deficiency
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