- Enantiomers of 1-[(4-chlorophenyl)phenylmethyl]-4-[(4-methylphenyl) sulfonyl]piperazine
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Levorotatory and dextrorotatory enantiomers of 1-[(4-chlorophenyl)phenylmethyl]-4-[(4-methylphenyl)sulfonyl]piperazine of the formula STR1 their preparation and use for the preparation of substantially optically pure enantiomers of 1-[(4-chlorophenyl)phenylmethyl]piperazine, which are themselves valuable intermediate products for the preparation of optically active therapeutic compounds having a very high degree of optical purity.
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- Chromogenic and fluorogenic crown ether compounds for the selective extraction and determination of Hg(II)
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Two novel crown ether compounds, N,N′-bis(2-hydroxy-5-nitrobenzyl)-4,13-diazadibenzo-18-crown-6 (CCE) and N,N′-bis(7-hydroxy-4-methylcoumarin-8-methylene)-4,13-diazadibenzo-18- crown-6 (FCE), have been synthesized as potential reagents for the selective e
- Vaidya, Bikas,Zak, Jerzy,Bastiaans, Glenn J.,Porter, Marc D.,Hallman, Johnny L.,Nabulsi, Nabeel A. R.,Utterback, Marty D.,Strzelbicka, Bozena,Bartsch, Richard A.
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p. 4101 - 4111
(2007/10/02)
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- Chromogenic Diaza-Crown Ether Dicarboxylic Acids for Determination of Calcium Ions
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The synthesis of two novel calcium chromoionophores 2 and 3, which are based on a benzodiazacrown ether with an inward-facing methoxyl group and bear two acetic acid groups and a 2,4,6-trinitroanilino chromophore, is described.Calcium and magnesium respon
- Bartsch, Richard A.,Chapoteau, Eddy,Czech, Bronislaw P.,Krzykawski, Jan,Kumar, Anand,Robison, Thomas W.
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p. 616 - 621
(2007/10/02)
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- Synthesis of Symmetrically Substituted Bicyclic Guanidines
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The symmetrically 2,2,8,8-tetraalkylsubstituted bicyclic guanidines 14a and b are prepared stereoselectively via construction of the open-chain triamines 11a and b and subsequent cyclisation.A one-pot reaction gives the unsubstituted guanidine 14c in high
- Schmidtchen, Franz P.
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p. 2175 - 2182
(2007/10/02)
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