The Solid-state Photodimerisation of 2,5-Dibenzylidenecyclopentanone (DBCP): a Topochemical Reaction that yields an Amorphous Product

DOI: 10.1039/P29840000071

Source and publish data:

Journal of the Chemical Society. Perkin transactions II p. 71 - 76 (1984)

Update date:2022-08-02

Topics: PHOTOCHEMICAL REACTION Irradiation Light Absorption Dimer Photoreactivity Molecular arrangement Reaction pathway Crystal lattice Solid-state reaction

Authors:

Theocharis, Charis R.

Jones, William

Thomas, John M.

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Article abstract of DOI:10.1039/P29840000071

When 2,5-dibenzylidenecyclopentanone (DBCP) is irradiated by u.v. light in the crystalline state the principal product formed by a <2 + 2> dimerisation is 2,9-dibenzylidene-6,12-diphenyldispiro<4.1.4.1>dodecane-1,8-dione (DDBCP); a subsidiary dimeric species is formed in substantial amounts at low conversion but it is consumed during the course of further reaction and is absent when the total conversion approaches 90percent.Crystalline (+)-2,5-dibenzylidene-3-methylcyclopentanone under the same conditions is photostable.The contrasting photoreactivity of these two solids is interpreted in terms of the mutual disposition of potentially reactive olefinic bonds on neigbouring molecules.Even when such bonds are not parallel (and for DBCP they are inclined at an angle of 56 deg) reaction may ensue since the distances separating the carbon atoms are approximately 3.7 Angstroem.It is argued that the photostability of DB(+)3MeCP, where the separation distances of the potentially reactive olefinic bonds on adjacent molecules are comparable to those in DBCP and where the bonds are again not parallel, is attributable to the non-coplanarity of the two ?-bonds.

Full text of DOI:10.1039/P29840000071

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