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1Author    NazmiA. Kassab, Sanaa0. Abd, Allah, SaidA. Elb, AhA. TiRequires cookie*
 Title    Arylazoisoxazolinthiones: Preparation and Reactions of 4-Arylazo-3-methyl-2-isoxazolin-5-thiones  
 Abstract    The arylazo derivatives (2) of 3-methyl-2-isoxazolin-5-thione were prepared. Alkylation 
  Reference    (Z. Naturforsch. 33b, 75—79 [1978]; received August 24 1977) 
  Published    1978 
  Keywords    ) Alkylation, Grignard's Reaction, Arylazoisoxazolinimines, Arylazoisoxazolinhydrazones, Ring Cleavage 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0075.pdf 
 Identifier    ZNB-1978-33b-0075 
 Volume    33 
2Author    Requires cookie*
 Abstract    The reaction of imines with various electrophiles have afforded only N-alkylated products, contrary to earlier reports. While a large amount of work has been done on the synthetic applications of tertiary enamines, pioneered by S t o r k and coworkers1*2, less is known about the scope of similar applicability of secondary enamines. Secondary enamines predo­ minantly exist in the imino form both in aliphatic and in cyclic compounds except in cases where the R. R I tertiary enamine secondary enamine 
  Reference    (Z. Naturforsch. 30b, 128—131 [1975]; received September 13 1974) 
  Published    1975 
  Keywords    Imines, Enamines, Alkylation, Tautomerism 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0128.pdf 
 Identifier    ZNB-1975-30b-0128 
 Volume    30 
3Author    Atta-Ur -Rahman, ViqarUddin Ahmad, Mumtaz Sultana, Nusrat Perveen, Nighat Sultana, H.E JRequires cookie*
 Title    Imine-Enamine Tautomerism -Nucleophilic Reactions of Imines  
 Abstract    A reinvestigation of the reactivity of N-isopropylidene cyclohexylamine to methyl acrylate by GC-MS analysis has shown that the major product is the ß-aminoester (9) formed by the N-alkylation of cyclohexylamine which may be generated by a dimerisation-elimination sequence. A number of other products resulting from N-and C-alkylation of the ketimine have been identified. 
  Reference    Z. Naturforsch. 37b, 757—761 (1982); received September 25 1981 
  Published    1982 
  Keywords    Enaminos, Ketimines, Nucleophiles, Alkylation 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0757.pdf 
 Identifier    ZNB-1982-37b-0757 
 Volume    37 
4Author    Dieter Sellmann, Christine Rohm, Matthias Moll, Herrn Professor, H. P. FritzRequires cookie*
 Title    Protonierung und Alkylierung der  
 Abstract    Thiolatdonoren von Ru(II)-Komplexen mit [Ru(,buS5')]-Fragmenten ('buS5,-H 2 = 2,2'-Bis(2-mercapto-3,5-di-/-butylphenylthio)diethylsulfid) Transition Metal Complexes with Sulfur Ligands, CXV+. Protonation and Alkylation of Thiolate Donors in Ru(II) Complexes with [Ru('buS5')] Fragments ('buS5'-H 2 = 2,2'-Bis(2-mercapto-3,5-di-t-butylphenylthio)diethylsulfide) Reaction of meso-[Ru(L)(,buS5')] complexes (L = CO (1), PPh3, PCy3) with one equivalent of oxonium salts R3OBF4 (R = CH3, C2H5) yields the C, symmetrical monoalkyl derivatives [Ru(L)('buS5'-R)]BF4 (L = CO, R = CH3 (2), C2H5 (3); L = PPh3, R = CH3 (5); L = PCy3, R = CH3 (6)), in which one of the thiolate donors of the starting complexes is alkylated diastereospecifi-cally. Monoalkylation of the binuclear complex [Ru('buS5')]2 leads to Q symmetrical [Ru('buS5'-CH3)]2(BF4)2 (7) which gives the hydrazine complex [/i-N2H4{Ru('buS5'-CH3)}2](BF4)2-N2H4 (9) upon reaction with N2H4. Reaction of 1 with 1.5 equivalents of CF3S 03H yields the isolable thiol complex [Ru(CO)('buS5'-H)]CF3SOy0.5 CF3S03H (4). The 'H-NMR spectra are temperature-depen­ dent and indicate exchange of the thiol proton between the thiolate donors of the ,bus 5'2-ligand. Twofold protonation of 1 could only be proved IR-spectroscopically, dialkylation of 1, however, yields isolable [Ru(CO)('buS5'-(CH3)2)](BF4)2 (8) as a mixture of diastereomers. The IR stretching frequencies i/(CO) of the CO complexes indicate that the electron densities at the ruthenium centers are decreased and the Ru-L bonds are weakened. However, the ligands L in the [Ru(L)('buS5'-R)]BF4 complexes do not exchange more readily than in the parent complexes. Ubergangsmetallkomplexe mit Schwefelliganden, CXV+. 
  Reference    Z. Naturforsch. 50b, 1729—1738 (1995); eingegangen am 2. Mai 1995 
  Published    1995 
  Keywords    Ruthenium Sulfur Complexes, Alkylation, Protonation 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-1729.pdf 
 Identifier    ZNB-1995-50b-1729 
 Volume    50 
5Author    H.E JRequires cookie*
 Title    Reactions of Harmaline and its Derivatives, IV Synthesis of a Pentacyclic System Isomeric with ll-Methoxy-5,6-dihydrosempervirine  
 Abstract    A t t a -u r -R a h m a n , A n w e r B a s h a , and V iq a r U d d e n A h m a d 
  Reference    (Z. Naturforsch. 30b, 653 [1975]; received March 4 1975) 
  Published    1975 
  Keywords    Harmaline, Condensation, jS-Carboline, Enamine, Alkylation 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0653_n.pdf 
 Identifier    ZNB-1975-30b-0653_n 
 Volume    30 
6Author    NazmiA. Kassab, Sanaa0. Abd, Allah, SaidA. ElbahaiiRequires cookie*
 Title    Arylhydrazonothiazolidinones: Ring Cleavage and Alkylation of the 5-Arylhydrazono Derivatives of Rhodanine and Isorhodanine  
 Abstract    The 5-arylhydrazono derivatives of rhodanine and isorhodanine were subjected to the action of hydrazine hydrate to afford the arylhydrazonomercaptomethyl-triazolinones (3) and -triazolinthiones (3) respectively. Treatment of 1 with benzylamine afforded thioxalic acid dibenzylamide (5). On the other hand treatment of 2 with the same reagent afforded the corresponding benzylimino derivatives (6). Alkylation of 1 and 2 with ethyl bromoacetate and chloroacetamide yielded the corresponding S-alkyl derivatives (7) and (8), respectively. The behaviour of the thiazolidinone ring system toward a variety of nucleophilic reagents has been extensively described in the literature [1-6]; reports on the behaviour of the 5-arylhydrazono derivatives of the thiazolidinone ring system remain relatively few. In continuation to our interest in the chemistry of heterocyclic imines [7-9], it was thought worth-while to extend our study to the 5-arylhydrazono derivatives of rhodanine [10-12] and isorhodanine [13] to compare the effect of the presence of the arylhydrazono group on the behaviour of the thia-zolidinone ring. The 5-arylhydrazono derivatives of rhodanine (la-d) and isorhodanine (2a-d) were subjected to the action of hydrazine hydrate at room tempera-ture, whereby an exothermic reaction took place, to ¥ Ar-N-N=C—C=0 I I S NH V la-d 4 Ar-N-N = C—C—N-H i Ii I SH N N-H V 3a-d A H Ar-N-N=C—C=S 2a-d S NH V Ar-N-N=C—C—N-H i SH 4a-d N N-H Y 0 1, 2, 3 and 4 Ar a: C6H5 b: C6H4CH3-O c: C6H4CH3-J9 D: C6H4C1 -p 
  Reference    Z. Naturforsch. 34b, 507—510 (1979); received September 28 1978 
  Published    1979 
  Keywords    Arylhydrazonorhodanines, Arylhydrazonoisorhodanines, Ring Cleavage, Triazolinones, Alkylation 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0507.pdf 
 Identifier    ZNB-1979-34b-0507 
 Volume    34 
7Author    Dieter Sellmann, Peter Lechner, Falk Knoch, M. Atthias, MollRequires cookie*
 Title    Übergangsmetallkomplexe mit Schwefelliganden  
 Abstract    , LXXIII. Diastereospezifische Dichlormethylierung schwefelreicher IRu'^SRR XPPh^yS/j-Komplexe (SRR' = einzähniger Thioether-oder Thiol-Ligand; 'S4'2-= l,2-Bis(2-mercaptophenylthio)ethan(2-))* Transition Metal Complexes with Sulfur Ligands, LXXIII. Diastereospecific Dichlorom ethylation of Sulfur Rich [Run(SR R')(PPh3)'S4'] Complexes (SR R' = M onodentate Thioether or Thiol Ligand; 'S4': ~ = 1,2-Bis(2-m ercaptophenylthio)ethane(2-)) Under exclusion o f air the thioether and thiol complexes [Ru(SRR')(PPh3)'S4'] ('S4'2-= l,2-bis(2-m ercaptophenylthio)ethane (2 -)) easily react with C H C l, yielding [Ru(Cl)(PPh,)('S4'-C H C L)] in which one thiolato atom o f the 'S4' ligand is diastereospecifical-ly dichloromethylated. In the presence o f air, however, [Rum(Cl)(PPh3)'S4'] is formed. The molecular structures o f [Ru(Cl)(PPh3)('S4'-C H C l:)]-2C H C l3 and [Rum(Cl)(PPh3)'buS4'] have been determined by X-ray crystallography. 'buS4'2-(= 1,2-bis(3,5-di(/-butyl)-2-m ercaptophenylthio)ethane(2-)) is the r-butyl derivative o f the 'S4' ligand. Reasons for ob ­ served diastereospecifity o f alkylation are discussed. 
  Reference    Z. Naturforsch. 46b, 1585 (1991); eingegangen am 3. Mai 1991 
  Published    1991 
  Keywords    Transition Metal Sulfur Complexes, Diastereospecifity, Alkylation, X-Ray 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1585.pdf 
 Identifier    ZNB-1991-46b-1585 
 Volume    46 
8Author    YousrY M Mostafa, Adam, S.M A D ZayedRequires cookie*
 Abstract    Male mice were i.p. injected with two doses (5& 15 m g/kg body weight) o f [l-14C]ethyl-labelled chlorpyrifos. The radioactivity in liver, fat, kidney and urine was measured 6, 24, 48, and 192 h after treatment. Liver R N A and D N A were isolated and hydrolyzed and the bases separated by ion-exchange chromatography. R adioactivity resulting from incorporation and alkylation o f RNA and D N A was measured. Labelled 7-ethylguanine was found in R N A hydrolysate which am ounted 5.5 x 10-3 calculated as fraction o f the applied dose. In D N A hydrolysate [14C]7-ethylguanine was m issing and the major radioactivity was found in two unknown peaks, one o f which corresponds to 3 x 10-2 o f the applied dose. The results indicate that the extent o f alkylation obtained with clorpyrifos is high as com pared with other organophos-phates with methyl esters. 
  Reference    Z. Naturforsch. 38c, 461—464 (1983); received Septem ber 22 1982 
  Published    1983 
  Keywords    DN A, RNA, Alkylation, Insecticides, Chlorpyrifos 
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 TEI-XML for    default:Reihe_C/38/ZNC-1983-38c-0461.pdf 
 Identifier    ZNC-1983-38c-0461 
 Volume    38