%0 Journal Article
%T Synthesis and spectroscopic characterization of 5-diaminomethylidene barbiturates
%A Figueroa-Villar
%A Jos¨¦ D.
%A Clemente
%A F¨¢bio C.
%A Silva
%A Ana C. C. da
%J Journal of the Brazilian Chemical Society
%D 2001
%I Sociedade Brasileira de Qu¨ªmica, SBQ
%R 10.1590/S0103-50532001000200020
%X the reaction of amines with dithiocyclohexylidenes is a general reaction for the synthesis of diaminomethylidene barbiturates. when diamines of the type h2n-(ch2)n-nh 2 are used as nucleophiles bicyclic compounds are the major reaction products, with yields increasing as n decreases, n = 2, 3, 4. when n = 6, macrocyclic compounds, novel 18 and 27 member rings, are obtained in very good yields. the 1h and 13c nmr assignment for all products is discussed.
%K macrocycles
%K diaminomethylidene barbiturates
%K dithiocyclohexylidenes
%K dithiolane.
%U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-50532001000200020&lng=en&nrm=iso&tlng=en