A new phenanthraquinone, bulbophyllanthrone was isolated together with the known flavonoids chrysin and pinobanksin from the orchid Bulbophyllum odoratissimum. The structure was established mainly from spectroscopic evidence. © 1991.

P L MAJUMDER

R C SEN

University of Calcutta (informally known as Calcutta University or CU) is a collegiate public state university located in Kolkata, West Bengal, India.&nbsp;Within India it is recognized as a &quot;Five-Star University&quot; and accredited &quot;A&quot; Grade by National Assessment and Accreditation Council.

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The University of Calcutta has secured the Fifth position among the Universities of India in the prestigious &quot;Indian University Ranking 2019&quot; list, released by the NIRF of the Ministry of Human Resource Development, Government of India.

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It was established on 24 January 1857, and was one of the first institutions in Asia to be established as a multidisciplinary and Western-style university. Its alumni and faculty include several heads of state, heads of government, social reformers, prominent artists, only academy award winner and Dirac medal winner in India, many Fellows of the Royal Society and five Nobel laureates as of 2019 which is highest in South Asia.

University Of Calcutta

Bulbophyllanthrone, a phenanthraquinone from Bulbophyllum odoratissimum

Phytochemistry

From the orchid Cymbidium pendulum were isolated, besides the previously reported 3,7-dihydroxy-2,4,8-trimethoxyphenanthrene, a new phenanthrene derivative, pendulin. While the structure of the former was further confirmed by its 13C NMR spectral data, that of the latter was established as 3-hydroxy-2,4,6,7,8-pentamethoxyphenanthrene from spectroscopical chemical evidence. © 1991.

Pendulin, a polyoxygenated phenanthrene derivative from the orchid Cymbidium pendulum

An amorphous phenanthrene, named nudol has been isolated from Eulophia nuda, Eria carinata and E. stricta. It was identified as 2,7-dihydroxy-3,4-dimethoxyphenanthrene. Synthesis of nudol and its dimethyl ether is described. © 1985.

Nudol, a phenanthrene of the orchids Eulophia nuda, Eria carinata and Eria stricta

Bulbophyllanthrin, a novel phenanthrene derivative from the orchid Bulbophyllum leopardium, was shown to have the structure 1a mainly on the basis of spectral evidence including 13C and 2D NMR spectra. © 1985.

Journal	Phytochemistry
Publisher	-
ISSN	0031-9422