Bulbophyllanthrin, a phenanthrene of the orchid Bulbophyllum leopardium
01 Jan 1985-Phytochemistry (Pergamon)-Vol. 24, Iss: 9, pp 2083-2087
TL;DR: Bulbophyllanthrin, a novel phenanthrene derivative from the orchid B. leopardium, was shown to have the structure 1a mainly on the basis of spectral evidence including 13 C and 2D NMR spectra as discussed by the authors.
About: This article is published in Phytochemistry.The article was published on 1985-01-01. It has received 43 citations till now. The article focuses on the topics: Phenanthrene & Bulbophyllum.
TL;DR: The present study furnishes an overview of the hydroxy or/and methoxy-substituted 9,10-dihydro/phenanthrene, methylated, prenylated and other monomeric derivatives, dimeric and trimeric phenanthrenes and their biological activities.
TL;DR: A dicationic phosphine with no spacer between the phosphorus atom and the two positively charged groups is described, which makes its donor ability poorer than that of phosphites and only comparable to extremely toxic or pyrophoric compounds such as PF3 or P(CF3)3.
Abstract: Very often ligands are anionic or neutral species. Cationic ones are rare, and, when used, the positively charged groups are normally appended to the periphery of the ligand. Here, we describe a dicationic phosphine with no spacer between the phosphorus atom and the two positively charged groups. This structural feature makes its donor ability poorer than that of phosphites and only comparable to extremely toxic or pyrophoric compounds such as PF3 or P(CF3)3. By exploiting these properties, a new Au catalyst has been developed displaying a dramatically enhanced capacity to activate π-systems. This has been used to synthesize very sterically hindered and naturally occurring 4,5-disubstituted phenanthrenes. The present approach is expected to be applicable to the development and improvement of many other transition metal catalyzed transformations that benefit from extremely strong π-acceptor ligands. The mechanism of selected catalytic transformations has been explored by density functional calculations.
TL;DR: Two new phenanthrenes (4,9-dimethoxyphenanthrene-2,5-diol and 4,6-dimethyltoxymethylhexane-1,3,7-triol) and two new 9,10-dihydrophenanthreness (4methoxy-9, 10-dibenzyls and the triterpenoid friedelin were isolated and characterized from the hexane extract of the orchid Bulbophyllum vaginatum) were determined by spectroscopic analyses
TL;DR: Moscatilin, a new bibenzyl derivative isolated from the orchid Dendrobium moscatum, was shown to have the structure 4,4′-dihydroxy-3,3′,5-trimethoxybibensyl.
TL;DR: Lusianthrin and lusian-thridin, two new stilbenoids, were isolated from the orchid Lusia indivisa.
TL;DR: In this article, the 13 C NMR spectra of 15 neolignans of several structural types and two lignans were analyzed and their carbon shifts assigned, and the shifts of pyrogallol ether and ethyl phenyl carbinyl ether models were used in this connection.
TL;DR: 2,7-Dihydroxy-4-methoxy-9,10-dihydrophenanthrene was isolated and identified from the whole plant of Coelogyne ochracea and C. elata.
TL;DR: An amorphous phenanthrene, named nudol has been isolated from Eulophia nuda, Eria carinata and E. stricta and was identified as 2,7-dihydroxy-3,4-dimethoxyphenanthrene.
TL;DR: Two new modified 9, 10-dihydrophenanthrenes of the orchids Pholidota articulata, Otochilus porecta and O. fusca have been established and NMR spectral analysis of isoflavidinin acetate confirmed its structure.