Synthesis and X-Ray Crystal Structure Analysis of 1,4-Epoxy-4-methyl- 1H,4H-2,3-benzodioxepin

2011 ◽  
Vol 66 (4) ◽  
pp. 419-424
Author(s):  
David S. Giera ◽  
Lothar Hennig ◽  
Thomas Gelbrich ◽  
Christoph Schneider
Keyword(s):  
Crystal Structure ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
Acetate Solution ◽  
Enantiomerically Pure ◽  
X Ray ◽  
Monoclinic Form ◽  
Secondary Ozonide ◽  
Orthorhombic Modification ◽  
Polymorphic Forms

Ozonolysis of 2-methyl-1H-indene (1) afforded the stable secondary ozonide 1,4-epoxy-4-methyl- 1H,4H-2,3-benzodioxepin (2). This compound crystallizes in two polymorphic forms, depending on the solvent used. The monoclinic form 2a containing two symmetry-independent molecules (enantiomers) is obtained by crystallization from dichloromethane. In contrast, the orthorhombic modification 2b is obtained from ethyl acetate solution and crystallizes as a conglomerate of enantiomerically pure single crystals. Additionally, the ring-opened product 2-(2-oxopropyl)benzoic acid (3) was obtained and investigated by X-ray crystal structure analysis.

Synthetic Access to a Novel Binaphthyl Ligand Bearing a Phosphine and a Triazole Donor Site

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1438-1448 ◽  
Author(s):  
Claudia May ◽  
Yu Sun ◽  
Gotthelf Wolmershäuser ◽  
Werner R. Thiel
Keyword(s):  
Crystal Structure ◽  
Coordination Chemistry ◽  
Structure Analysis ◽  
Donor Site ◽  
Crystal Structure Analysis ◽  
Pure Compound ◽  
Enantiomerically Pure ◽  
X Ray ◽  
First Time

The combination of a diphenylphospinyl and a triazol-3-yl unit was realized for the first time at a 1,1'-binaphthyl backbone. This novel type of P,N-ligand is accessible as an enantiomerically pure compound in just a few steps. First experiments on the coordination chemistry with palladium(II) chloride have been carried out. A series of intermediates and a binuclear palladium(II) complex could be characterized by X-ray crystal structure analysis

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

X-ray crystal structure analysis of parthenin–A sesquiterpene lactone

1994 ◽  
Vol 29 (3) ◽  
pp. 373-378 ◽  
Author(s):  
Vivek K. Gupta ◽  
K. N. Goswami ◽  
K. K. Bhutani
Keyword(s):  
Crystal Structure ◽  
Sesquiterpene Lactone ◽  
Structure Analysis ◽  
Crystal Structure Analysis ◽  
X Ray
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