Lecanoric Acid and Some Constituents of Parmelia tinctorum and Pseudevernia intensa

摘要: Infrared, ultraviolet, and nuclear magnetic resonance data, not previously reported for lecanoric acid, were obtained with a pure sample of the compound isolated from Parmelia tinctorum Del. ex Nyl. This lichen also contained atranorin chloroatranorin. The same substances Pseudevernia intensa (Nyl.) Hale & W. Culb. Chloroatranorin had been detected in either these species. Lecanoric acid (Fig. 1), common medullary constituent lichens, is simplest known naturally occurring depside first compounds to be synthesized laboratory (Fischer Fischer, 1913). In spite its distinctive history, has studied recently, spectral properties have reported. present paper, infrared, data are recorded infrared ultraviolet given two derivatives. 1 investigation was supported by U.S. Public Health Service Research Grant GM08345 Division General Medical Sciences, National Institutes Health. We thank Dr. Chicita F. Culberson, who directed this research. 2 Department Chemistry, Duke University, Durham, North Carolina 27706. 3 Laboratoire de Botanique appliquie, 12 bis, rue Robien, Rennes, France. 4 elemental analyses performed Schwarzkopf Microanalytical Laboratory, Woodside, New York. content downloaded 157.55.39.215 on Wed, 31 Aug 2016 04:51:05 UTC All use subject http://about.jstor.org/terms 94 THE BRYOLOGIST [Volume 70