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Topochemical dimerization of non-parallel double bonds: 7-methoxycoumarin

✍ Scribed by M.M. Bhadbhade; G.S. Murthy; K. Venkatesan; V. Ramamurthy

Book ID: 103028019
Publisher: Elsevier Science
Year: 1984
Tongue: English
Weight: 550 KB
Volume: 109
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(84)85731-0

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✦ Synopsis

X-ray crystal structure artaipsis of 7-rt]efItosycouIllarin rer*cnls tftat the reactive double botids are ratsred by sbnttt 65" with rerpcct to cx11 otltcr, the centre-to-ccntre distance ~C~NIYX~ tile double bonds being 3.83 A. In spite of this unfworrrable nrranpcntcnt. pltotodirllerlzation occurs in tlic crystnllinc state ~ieldinl: ttx syn-imad-tail dimcr as tllc only producr. Lattice cncgp calculations on &xound-state molecules in crystals tluow Ji$lt on tile mcclwnistn of tlx rextion.

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