(Chemical Equation Presented) Cycloadditions of C,N-diarylnitrones to β-nitrostyrenes occurred to yield two diastereoisomeric cycloadducts, the 3,4-trans-4,5-trans substituted isoxazolidine derivatives being formed selectively as the major products. These were characterised by spectroscopic and X-ray data. Conformational studies were carried out by X-ray crystallography and Molecular Modelling.

A BANERJI

M GUPTA

P K BISWAS

T PRANGE

A NEUMAN

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

Journal of Heterocyclic Chemistry

A DFT/B3LYP/6-31G*study was carried out to predict the regio- and stereoselectivities of 1,3-dipolar cycloadditions of C,N-disubstituted aldonitrones to chalcones in terms of FMO theory, DFT-based reactivity indices, and activation energy calculations. The structures of the resultant 2,3,4,5-tetrasubstituted isoxazolidines were determined by means of NMR spectroscopy and X-ray analysis. © 2010 Springer-Verlag.

Journal	Journal of Heterocyclic Chemistry
Publisher	HeteroCorporation
ISSN	0022-152X