The nitration of 1,2,3,4-tetramethyl-5,6-dinitrobenzene; X-ray crystal structure of cis-2,5,6,6-Tetramethyl-2,3,4,5-tetranitrocyclohex-3-enone

1982 ◽  
Vol 35 (6) ◽  
pp. 1237 ◽  
Author(s):  
MJ Gray ◽  
MP Hartshorn ◽  
KE Richards ◽  
WT Robinson ◽  
KH Sutton ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Nitric Acid ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Mechanism Of Formation ◽  
X Ray ◽  
Fuming Nitric Acid ◽  
Cis And Trans ◽  
Cis Isomer

Nitration of 1,2,3,4-tetramethyl-5,6-dinitrobenzene (1) with fuming nitric acid in dichloromethane gives cis-and trans-2,5,6,6-tetramethyl-2,3,4,5-tetranitrocyclohex-3-enones (9) and (10), the structure of the cis isomer being confirmed by X-ray crystal structure analysis. The mechanism of formation of tetranitro ketones (9) and (10) is discussed.

scholarly journals Preparative-scale HPLC Resolution of Metallacyclic η3-Allyltricarbonyliron Complexes and Determination of the Absolute Configuration by X-Ray Crystal Structure Analysis

1999 ◽  
Vol 23 (9) ◽  
pp. 578-579
Author(s):  
Rainer Schobert ◽  
Hermann Pfab ◽  
Jutta Böhmer ◽  
Frank Hampel ◽  
Andreas Werner
Keyword(s):  
Crystal Structure ◽  
Silica Gel ◽  
Structure Analysis ◽  
Absolute Configuration ◽  
Crystal Structure Analysis ◽  
Preparative Scale ◽  
X Ray ◽  
The Absolute

Racemates of (η3-allyl)tricarbonyliron lactone complex Fe(CO)3{η1:η3-C(O)XCH2CHCMeCH2} 1a (X = O) and (η3-allyl)tricarbonyliron lactam complex 2a (X = NMe) are resolved on a preparative scale by HPLC on cellulose tris(3,5-dimethylphenyl)carbamate/silica gel RP-8 and the absolute configuration of (-)-2a is determined by X-ray crystal structure analysis.

Second-Generation Inhibitors for the Metalloprotease Neprilysin Based on Bicyclic Heteroaromatic Scaffolds: Synthesis, Biological Activity, and X-Ray Crystal-Structure Analysis

2005 ◽  
Vol 88 (4) ◽  
pp. 731-750 ◽  
Author(s):  
Stefan Sahli ◽  
Brian Frank ◽  
W. Bernd Schweizer ◽  
François Diederich ◽  
Denise Blum-Kaelin ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Biological Activity ◽  
Structure Analysis ◽  
Second Generation ◽  
Crystal Structure Analysis ◽  
X Ray
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