Optically active boron. Crystal structure of (+)-4-methylpyridinetrimethylaminebromohydroboron hexafluorophosphate

1971 ◽  
Vol 10 (4) ◽  
pp. 667-673 ◽  
Author(s):  
Giuseppe Allegra ◽  
Ettore Benedetti ◽  
Carlo Pedone ◽  
Smith L. Holt
Keyword(s):  
Crystal Structure ◽  
Optically Active

Crystal structure of optically active poly(isopropylethylene oxide)

1975 ◽  
Vol 13 (2) ◽  
pp. 285-294 ◽  
Author(s):  
Yasuhiro Takahashi ◽  
Hiroyuki Tadokoro ◽  
Tsuneo Hirano ◽  
Akira Sato ◽  
Teiji Tsuruta
Keyword(s):  
Crystal Structure ◽  
Optically Active

Synthese neuer optisch aktiver Rh-Komplexe: Die Kristallstruktur von [(5S)-3,4-Bis(diphenylphosphino)-5-menthoxy-2(5H)-furanon](1,5-cyclooctadien)rhodium-hexafluorophosphat / Synthesis of New Optically Active Rh-Complexes: The Crystal Structure of [(5S)-3,4-Bis(diphenylphosphino)-5-menthoxy-2(5 H)-furanone](1,5-cyclooctadiene)rhodium-hexafluorophosphate

1989 ◽  
Vol 44 (8) ◽  
pp. 884-888 ◽  
Author(s):  
Dieter Fenske ◽  
Kurt Merzweiler
Keyword(s):  
Crystal Structure ◽  
Methyl Ester ◽  
Single Crystal ◽  
Enantiomeric Excess ◽  
Optically Active ◽  
Monoclinic Space Group ◽  
Space Group ◽  
X Ray ◽  
Lattice Constants

The chiral diphosphine 1 reacts with [(diolefin)Rh(THF)2]PF6 (diolefine: 1.5-cyclooctadiene, norbornadiene) to form the complexes 4 and 5. The structure of 4 was determined by single crystal X-ray analysis. 4 crystallizes in the monoclinic space group P21. The lattice constants (at 180 K) are: a = 974.0(6); b = 3889.2(29); c = 1309.4(5) pm; β = 105.25(4)°. The hydrogenation of methyl-α-acetamidocinnamate in the presence of 5 yields (R)-N-acetylphenylalanine methyl ester with 33% enantiomeric excess.

Synthesis and Properties of Optically Active Coronands Incorporating Sulfoxide and Sulfoximine Functionality

1987 ◽  
Vol 40 (1) ◽  
pp. 61 ◽  
Author(s):  
TW Hambley ◽  
TW Hambley ◽  
B Raguse ◽  
B Raguse ◽  
DD Ridley ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Alkali Metal ◽  
Association Constants ◽  
Optically Active ◽  
X Ray ◽  
Sodium Cations

A number of optically active coronands incorporating sulfoxide and sulfoximine functionality have been prepared and their association constants for complexes with alkali metal and ammonium picrates have been measured. Some of these complexes have association constants greater than 70000 1. mol-1 with selectivity for lithium and sodium cations, but no stereoselectivity has been observed for complexes with racemic ammonium guests. The X-ray crystal structure of one of the sulfoxide coronands is reported.

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