The Chemistry of Brazilian Quiinaceae. 1. Constituents of Touroulia guianensis and Lacunaria jenmani Otto R. Gottlieb ( 1), Mauro T. Magalhães (2), Geovane G. de Oliveira (3) e Arold<' Trainotti (3) The small family Ouiinaceae includes 4 The analysis of trunk wood of Touroulia genera (Froesia, Lacunaria, Quiina and Tou­ guianensis Aubl. revealed the presence of roulia) with 37 central and south american 2,6-dimethoxy-p-benzoquinone [Corrêa et ai., species. Although generally included in the 1970], friedelan-3oc-o l and friedelin [Drake & Campbe li, 1936], s itosterol and ~-sitostenone subclass Dilleniidae, arder Theales [Cronquist, [Lavie & Kaye, 1963]. and syringaresinol 1968]. and considered derived from t he [Weinges, 1961] . Friedelin, sitosterol and Ochnaceae or the Theaceae, the family has syringaresinol were also isolated from the even been placed in the subclass Rosidae, trunk wood of Lacunaria jenmani Ducke. arder Linales, and considered derived from the While, thus, both genera appear to be Linaceae [Hegnauer, 1968]. Jt was hoped that close chemical relatives, the analysis fails to chemical data, lacking at present time, mzy indicate affinities of the family, since the help to clarify the presently uncertain system­ isolated constituents are of widespread atic position. occurrence in the plant kingdom. ( 1 l - Instituto de Oufmlca, Universidade de São Paulo, São Paulo. ( 2 l - Centro de Tecnologia Agrícola e Alimentar, EMBRAPA, Rio de Janeiro. ( 3 l - lnsttiuto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte. ACTA AMAZONICA 7(2) - 291 lJTERAXURE CITED oxidative degradation o f friedelin. .J. Amer. Chem. Soe., 58 : 1681-1684 CORRÊA, D . DE B.; FONSECA E SILVA, L .G.; GorrLIEB, o R . & GONÇALVES, S.J. HEGN~UER, R. 1970 - Quinone and xanthone constituents of 1968 - Cbemotaxonomic der Pflanzen, v. 5, p. Kielmeycra. rupestris. Phytochemistry, 416, Birkhãuser Verlag, Base!. 9 : 447-541. LAVIE, D. & KAYE, I.A . CRONQUIST, A. 1963 - Isolation of f3-sitostenone from Quassia 1968 - The Evolution and Classification of amara. J. Chem. Soe., p . 5001-5002. Flowering Plants, p. 196, Nelson & Sons WEINGES, K . Ltda., London. 1961 - tlber einige neue Lignane und stereo­ ORAKE, N .L. & CAMPBELL, W.P. chemische Zusammenhãnge in der 1936 - Cerin and friedelin . III. Study of the Lignangruppe. Ber., 94 : 2522-2533. 292- ACTA AMAZONICA 7(2) .