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'Ring Closure' in keywords
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1980 (1)
1978 (1)
1Author    IbrahimI. Abd, El Gawad, Abd El-Hammid, Mohamad Harhash+, M. M. Abou El-ZahabRequires cookie*
 Title    Reinvestigation of the Behaviour of Benzal-anils towards the Action of Potassium Cyanide  
  Reference    Z. Naturforsch. 35b, 712—714 (1980); received January 7 1980 
  Published    1980 
  Keywords    Benzal-anils, Addition Reaction, 4-Imidazolidinone, Ring Closure 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0712.pdf 
 Identifier    ZNB-1980-35b-0712 
 Volume    35 
2Author    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