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  • Organic Chemistry  (461)
  • 1975-1979  (224)
  • 1960-1964  (237)
  • 11
    Electronic Resource
    Electronic Resource
    Transition-Metal Complexes with Bidentate Ligands Spanning trans-Positions. I. The synthesis of 2,11-bis(diphenylphosphinomethyl)benzo[c]-phenanthrene, a ligand promoting the formation of square planar complexes (1976)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 2674-2682 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bidentate ligand 2,11-bis(diphenylphosphinomethyl)benzo[c]phenanthrene (1) was synthesized from 2,11-dimethyl-benzo[c]phenanthrene (3) via the corresponding bromomethyl derivative 9. 3 was obtained from the cyclization with boron trifluoride etherate of 1,1-di-(p-methylphenethyl)-epoxyethane (7), which was prepared from 1,5-di(p-tolyl)-pentan-3-one (6).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19760590806
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  • 12
    Electronic Resource
    Electronic Resource
    Steric Effects in the STOBBE Condensation of 3,4-Disubstituted Acetophenones with Dimethyl Methylsuccinate (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 65-70 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sterische Effekte in der STOBBE-Kondensation von 3,4-disubstituierten Acetophenonen mit Dimethyl-methylsuccinatDie Kondensation von 3,4-Dimethyl-, 3,4-Dimethoxy- und 3,4-Dichloracetophenon mit Dimethylsuccinat in Gegenwart von Kalium-t-butylat lieferte in jedem Fall ölige Gemische der stereoisomeren Halbester 1 und 2. Während die (E)-Halbester 1 zu den entsprechenden 1-Acetoxy-3-nahpthoesäureestern 5 cyclisiert werden konnten, ergaben die (Z)-Halbester 2 unter den gleichen Bedingungen die entsprechenden 3-Oxo-inden-2-(α-subst.)-essigsäuren 7.Das Isomerenverhältnis wird mit sterischen Wechselwirkungen in den γ-Lacton-Zwischenprodukten 8 erklärt.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210108
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  • 13
    Electronic Resource
    Electronic Resource
    Zur Reaktion von o-Halogenbenzylcyaniden mit Schwefelkohlenstoff und Phenylisothiocyanat (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 1021-1028 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of o-Halobenzyl Cyanides with Carbon Disulfide and Phenyl IsothiocyanateStarting from o-halobenzyl cyanides 1 and carbon disulfide in the presence of sodium hydride dithiolates 3 are prepared, which are not isolated. Alkylation under cooling gives ketene S, S-acetals 4, while on heating at 100°C benzo[b]thiophenes 6 are obtained. Nitrile cyclisation yields thieno[2, 3-b]benzothiophene 7. Reaction of 1 with phenyl isothiocyanate/sodium hydride and subsequent alkylation leads to the ketene S, N-acetals 13 und to the thiazolidines 15.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210618
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  • 14
    Electronic Resource
    Electronic Resource
    Benzalphthalimidines and related compounds. Part VPart I, ref. [2]; Part II, A. M. Islam and E. M. Younes, Egypt J. Chem., 1973, 16, No. 1, 1-11; Part III, ref. [3] and Part IV, ref. [4].. Synthesis of 6-Nitro-3-benzal-2-substituted phthalimidines (1975)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 317 (1975), S. 567-574 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 6-Nitrobenzalphthalides reacted with amines to give 6-nitrobenzalphthalimidines. Reduction (H2S/NH3) of the 6-nitrobenzalphthalides gave open chain desoxybenzoin derivatives. 6-Aminophthalide condensed with aldehydes to give the corresponding arylidene aminophthalides only.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19753170408
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  • 15
    Electronic Resource
    Electronic Resource
    Synthesis, spectra, HMO-treatment, and some reactions of pyridazine derivatives. I. 6-Substituted- and 4,6-Disubstituted-3-Chloropyridazines (1977)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 369-376 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthese, Spektren, HMO-Berechnung und einige Reaktionen von Pyridazin-Derivaten. I. 6-Substituierte und 4,6-disubstituierte 3-ChlorpyridazineDie Synthese und einige Reaktionen von sechs neuen Pyridazin-Derivaten, und zwar 6-(3,4; 2,4- und 2,5-Dimethylphenyl)-3-chlorpyridazin 2a, c sowie 6-(3,4; 2,4- und 2,5-Dimethylphenyl)-4-methyl-3-chlorpyridazin 5a-c werden beschrieben. IR- und UV-Spektren werden mitgeteilt. Auf der Grundlage einer einfachen HMO-Methode werden an diesen Pyridazin-Derivaten theoretische Berechnungen durchgeführt, wobei sehr gute Übereinstimmung zwischen den theoretisch vorausgesagten Reaktivitäten und den experimentellen Werten erhalten wird.
    Notes: The synthesis and some reactions of six new pyridazine derivatives, namely: 6-(3,4-, 2,4- and 2,5-dimethylphenyl)-3-chloropyridazines and 6-(3,4- 2,4-, and 2,5-dimethylphenyl)-4-methyl-3-chloropyridazines are described. Their i.r. and u.v. spectra are given. Theoretical calculations for these new pyridazine derivatives, based on the simple HMO-method are performed. Very good agreement between the theoretically predicted reactivities and the experimental findings is obtained.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19773190304
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  • 16
    Electronic Resource
    Electronic Resource
    Synthese von Substanz P und acylierten Teilsequenzen (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 721-740 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Substance P and of Acylated Partial SequencesSubstance P undecapeptide has been synthesized by the stepwise procedure and via condensation of the fragments 1-4 and 5-11. Formation of pyrrolidone carboxylic acid- and S-tert. butyl peptides was observed. Gln(Mbh)-containing sequences have been synthesized but were not useful for fragment condensation due to there low solubility. Additionally, some derivatives have been prepared by acylation of the C-terminal pentapeptide. Reaction with trifluoracetic acid anhydride resulted in the formation of substituted 5-amino-oxazole derivatives as detected by mass spectrometric investigation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210504
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  • 17
    Electronic Resource
    Electronic Resource
    Folgeprodukte halogenierter Aldehyde. VII [1] Die Synthese von Di-(1,2,2,2-tetrachloräthyl)-chlorphosphat und Tri-(1,2,2,2-tetrachloräthyl)-phosphat (1976)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 902-906 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Derivatives of Halogenated Aldehydes. VII. The Synthesis of Di-(1,2,2,2-tetrachloroethyl) phosphorochloridate and Tri-(1,2,2,2-tetrachloroethyl) phosphateReaction of phosphorus pentachloride with an excess of chloral in carbon tetrachloride yields a mixture of the tetrachloroethoxy-phosphorus-chlorides 1  -  4. Following elimination of pentachloroethane by heating gives a mixture of phosphorus oxychloride, tetrachloroethyl phosphorodichloridate 6, di-(tetrachloroethyl)phosphorochloridate 7 and tri-(tetrachloroethyl) phosphate 8, which are separated by distillation in vacuo. The data of i.r., n.m.r. and mass spectra are concordant with the assigned structures.
    Notes: Durch Umsetzung von Phosphorpentachlorid mit einem Überschuß an Chloral in Tetrachlorkohlenstoff erhält man ein Gemisch der Tetrachloräthoxy-phosphor-chloride 1 - 4. Nachfolgende thermische Eliminierung von Pentachloräthan ergibt ein Gemisch von Phosphoroxychlorid, Tetrachloräthyl-dichlorphosphat 6, Di-(tetrachloräthyl)-chlorphosphat 7 und Tri-(tetrachloräthyl)-phosphat 8, die durch Destillation im Vakuum getrennt werden. Die IR- und NMR-spektroskopischen sowie die massenspektroskopischen Daten stimmen mit den angegebenen Strukturen überein.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19763180605
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  • 18
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Kinetik und zum Wärmeeffekt der Cyclotrimerisierung von Arylcyanaten (1976)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 923-929 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Kinetics and the Reaction Heat of the Cyclotrimerization of Aryl CyanatesThe kinetics and the reaction enthalpy of the polycyclotrimerization of 2,2-bis(4-cyanatophenyl)propane in ditolylmethane solution were investigated by means of direct calorimetry, varying the concentration of the catalyst (chromium(III) acetyl acetonate) and of the monomer as well as the reaction temperature, the water content of the solvent, and the amount of added acetyl acetone.The maximum reaction rate is proportional to the monomer concentration, to the square root of the concentration of the catalyst, and to the water content. It is inversely proportional to the amount of water added.Presumably, water participates in the formation of the active species of the catalyst, and the autocatalytic nature of the polycyclotrimerization of 2,2-bis(4-cyanatophenyl)propane in presence of chromium acetylacetonate is due to accumulation of the latter during reaction.
    Notes: Mittels direkter Kalorimetrie wird die Kinetik und der Wärmeeffekt der Polycyclotrimerisierung des 2,2-Bis-(4-cyanatophenyl)-propans in einer Ditolylmethanlösung in Abhängigkeit von der Katalysator (Chrom(II)-acetylacetonat)- und Monomerkonzentration sowie der Reaktionstemperatur, dem Wassergehalt des Lösungsmittels und Zusätzen von Acetylaceton zum System untersucht.Es wird gezeigt, daß die maximale Reaktionsgeschwindigkeit der Monomerkonzentration, der Quadratwurzel aus der Katalysatorkonzentration und dem Wassergehalt proportional und der Menge an zugesetztem Acetylaceton umgekehrt proportional ist.Es wird angenommen, daß Wasser an der Bildung der aktiven Form des Katalysators teilnimmt und daß der autokatalytische Charakter der Polycyclotrimerisierung des 2,2-Bis(4-cyanatophenyl)-propans in Gegenwart von Chromacetylacetonat mit der Anreicherung des letzteren während der Reaktion verbunden ist.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19763180608
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  • 19
    Electronic Resource
    Electronic Resource
    Folgeprodukte halogenierter Aldehyde IX. Die Synthese von Dialkyl-1,2,2,2-tetrachloräthyl- und Alkyl-phenyl-1,2,2,2-tetrachloräthyl-phosphaten (1977)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 23-28 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Derivatives of Halogenated Aldehydes. IX. The Synthesis of Dialkyl-1,2,2,2-tetrachloroethyl- and Alkyl-phenyl-1,2,2,2-tetrachloroethyl PhosphatesDialkyl-1,2,2,2-tetrachloroethyl- (3a-t) and alkyl-phenyl-1,2,2,2-tetrachloroethyl phosphates 3u, v are prepared by reactions of 1,2,2,2-tetrachloroethyl phosphorodichloridate 1 with one mole of an alcohol or phenol to give alkyl(phenyl)-1,2,2,2-tetrachlorethyl phosphorochloridates 2a-k, followed by treatment of the latter with a second alcohol. The n.m.r. spectra of 2 and 3 are discussed.
    Notes: Dialkyl-1,2,2,2-tetrachloräthyl- (3a-t) und Alkyl-phenyl-1,2,2,2-tetrachloräthyl-phosphate 3u, v werden dargestellt durch Umsetzungen von 1,2,2,2-Tetrachloräthyl-dichlorphosphat 1 mit einem Mol eines Alkohols oder Phenol zu den Alkyl(Phenyl)-1,2,2,2-tetrachloräthyl-chlorphosphaten 2a-k und deren Reaktionen mit einem zweiten Alkohol. Die 1H-NMR-Spektren von 2 und 3 werden diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19773190105
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  • 20
    Electronic Resource
    Electronic Resource
    Alkylaminomethylation and Chloromethylation of 2,3-Diphenyl Hydroxybenzofurans (1975)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 317 (1975), S. 353-358 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The application of the Mannich reaction to 2,3-diphenyl-5-hydroxybenzofuran 1 a and 2,3-diphenyl-6-hydroxybenzofuran 2 a, which gives rise to the corresponding aminomethyl derivatives 1 b-i and 2 b-i is described. Chemical, analytical and spectroscopic results are in a accord with the assigned structures. Attempted chloromethylation of compounds 1 a and 2 a afforded only the methylene-bis-compounds 3 and 4, respectively.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19753170302
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