Chemistry of Heterocyclic Compounds: Thiophene and Its by Edited by: Salo Gronowitz, Visit Amazon's Salo Gronowitz

By Edited by: Salo Gronowitz, Visit Amazon's Salo Gronowitz Page, search results, Learn about Author Central, Salo Gronowitz,

Actual homes of Thiophene Derivatives (S. Gronowitz & A. Hornfeldt).

Nucleophilic Substitution of Thiophene Derivatives (D. Spinelli, et al.).

Biologically lively Thiophene Derivatives Revisited: 1983 1988 (J. Press).

Index.Content:
Chapter I actual houses of Thiophene Derivatives (pages 1–294): Salo Gronowitz and Anna?Britta Hornfeldt
Chapter II Nucleophilic Substitution of Thiophene Derivatives (pages 295–396): Domenico Spinelli, Giovanni Consiglio, Carlo Dell'Erba and Marino Novi
Chapter III Biologically energetic Thiophene Derivatives Revisited: 1983–1988 (pages 397–502): Jeffery B. Press

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Additional resources for Chemistry of Heterocyclic Compounds: Thiophene and Its Derivatives, Part Four, Volume 44

Example text

X-ray crystallography showed that one in 2-pyrrolyl 2-thienyl ketone, the heterocyclic rings display an antitwisted syn conformation with respect to the central ketone bridge. The molecules are linked into centrosymmetric dimers through two N-H . . ’” The structure of 3acetylamino-2-thiolanonewas solved by direct methods. ’~’The unit cell of 2-mercapto-3-thenylidenecyclohexylamine contains two identical molecules. 347 The structures of thiophenium bismethoxycarbonylmethylide has been determined by X-ray a n a l y ~ i s .

359) The reaction of 2,5-dimethyl-3,4-dinitrothiophenewith morpholine led to 2,5-dimethyl-trans-2,3-dimorpholino-4-nitro-2,3-dihydrothiophene 69, as proved by X-ray analysis. 42' From the cycloaddition of phenyl azide to 3,6-dihydro-2H-thiopyran-3one, compounds 72 and 73 were obtained, the structures of which were proven by X-ray ~ r y s t a l l o g r a p h y . ~ ~ ~ VI. Structure Determination of Thiophenes by X-ray Crystallography 43 X-Ray crystallography was used for final structure determination of 74, obtained from the reaction of methylthio-3-dithiole-1,2-ylium ions with arylidene dinitriles in the presence of triethyl amine in methylene chloride, followed by r n e t h y l a t i ~ n In .

464 X-Ray powder photographs have been used for the detection of quasiracemates ( 1 : I molecular complexes of structurally similar compounds of opposite chirality), especially when the components are unstable at their melting points so that conventional detection of the quasiracemate by melting point diagrams is not feasible. Thus, powder photographs showed that 2-phenylsuccinic acid gave a true racemate, while optically inactive 2-thienylsuccinic acid was a solid solution of the enantiomers. ^'^ In a similar way, the configuration of optically active 3-thienylsuccinic acid was 2- and 3-thenylsuccinic acids were related to that of phenylsuccinic related to benzylsuccinic a ~ i d and ~ 2-thenyl-2-thienylacetic ~ ~ .

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