Defuscin, a new phenolic ester shown to be n-triacontyl p-coumarate, and (-)-shikimic acid have been isolated from the whole plant of Dendrobium fuscescens Griff. The 1H NMR spectrum of shikimic acid is indicative of the weighted average of its two half-chair conformers, the one with 4-OH and 5-OH in equatorial orientations being the major contributor. © 1989.

B TALAPATRA

A K DAS

S K TALAPATRA

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

Defuscin, a new phenolic ester from Dendrobium fuscescens: Conformation of shikimic acid

Phytochemistry

Dendrobium gibsonii, an Orchidaceae plant yielded the first natural fluorenone derivatives designated dengibsin and dengibsinin to which 1,5-dihydroxy-7-methoxy-9-fluorenone (1) and 1,6-dihydroxy-5, 7-dimethoxy-9-fluorenonc (2) structures have been assigned respectively. The structures are fully supported by the 1 H-NMR, IR, UV and MS spectral data of dengibsin and dengibsnin and a number of their pertinent derivatives. Aurantiamide acetate, dimethyl terephthalate and β-sitosterol have been isolated as the other constituents. © 1985.

Tetrahedron

On the chemistry of indian orchidaceae plants-II 1 1 For Part I see Ref. 1. Dengibsin and dengibsinin, the first natural fluorenone derivatives from dendrobium gibsonii lindl

Parthenolide and a new germacranolide, 11,13-dehydrolanuginolide, from Michelia lanuginosa

Class Conflict and Modernization in India

Chemistry of Plant Natural Products

Tetrahedron Letters

Efficient enantioselective syntheses of chloramphenicol and (d)-threo- and (d)-erythro-sphingosine

Journal	Phytochemistry
Publisher	-
ISSN	0031-9422