3-(4-p-Tolyloxybut-2-ynyloxy)[1]benzopyran-2-one (1), when refluxed in chlorobenzene, ethyl benzene, or xylene, gave exclusively 1-(p-tolyloxymethyl) pyrano[2,3-c][1]benzopyran-5(3H)-one (2), whereas through an ionic or radical pathway 2-methyl-1-(p-tolyloxymethyl)furo[2,3-c][1]benzopyran-4-one (3) was the exclusive product.

K C MAJUMDAR

R N DE

A T KHAN

S K CHATTOPADHYAY

K DEY

A PATRA

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

Studies of [3,3]sigmatropic rearrangements: rearrangement of 3-(4-p-tolyloxybut-2-ynyloxy)[1]benzopyran-2-one

Journal of the Chemical Society, Chemical Communications

Ecology

Books and Monographs Received Through March 1988

Chemischer Informationsdienst

ChemInform Abstract: ALKALOIDS OF VINCA PUSILLA: ISOLATION OF LOCHNERICINE, VINDOROSINE AND VENOTERPINE

Journal of Pharmaceutical Sciences

Naturally Occurring Coumarins and Related Physiological Activities

YAKUGAKU ZASSHI

Studies on Nitrogen-free Hypnotics. II

Helvetica Chimica Acta

Über Konstitution und toxische Wirkung von natürlichen und neuen synthetischen insektentötenden Stoffen

Studies of [3,3]sigmatropic rearrangements: Rearrangement of 3-(4-p-tolyloxybut-2-ynyloxy)[1]benzopyran-2-one

Journal	Journal of the Chemical Society, Chemical Communications
Publisher	-
ISSN	0022-4936