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1979 (1)
1978 (2)
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    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 
3Author    NazmiA. Kassab, AbdulHammid Harhash, SaidA. ElbahaiiRequires cookie*
 Title    Cleavage Reactions of Oxazolin-5-ones Reactions with 4-Substituted-2-aryl-2-oxazolin-5-ones  
 Abstract    The oxazoline ring in 4-arylazo-2-aryl-2-oxazolin-5-ones (1) is converted to triazolyl-carbonyl amino acids 2, 4 and 6 by the nucleophiles glycine, anthranilic and p-aminobenzoic acids, respectively. The arylidene derivatives 3 of 2-triazolyl-2-oxazolin-5-one were obtained. Triazolylbenzoxazinones 5, were obtained by the ring closure of the amino acid 4. Grignard's reagent effected ring cleavage of the oxazolinone ring in 4-cinnamylidene-2-aryl-2-oxazolin-5-ones yielding the carbinols 8, the latter cyclizes either in acidic or alkaline medium to afford either benzotropilidenes or oxazolines, respectively. 
  Reference    Z. Naturforsch. 33b, 1145—49 (1978); received April 7/June 22 1978 
  Published    1978 
  Keywords    Ring Cleavage, Triazolylcarbonyl Amino Acids, Nucleophilic Substitution, Grignard's Reaction, Ring Closure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1145.pdf 
 Identifier    ZNB-1978-33b-1145 
 Volume    33