Inter- and
intramolecularphotochemical processes involving the addition of a C–C double (or triple) bond to (i) to the 1,2-positions
of an arene in which case it is called an
ortho photocycloaddition, with formation of a benzocyclobutene (or a benzocyclobutadiene) derivative, (ii)
to the 1,3-positions of an arene in which case it is called a
meta photocycloaddition, with formation of tricyclo[3.3.0.0
2,8]oct-3-ene (or octa-3,6-dien) derivatives, or (iii) to the 1,4-positions of an arene
in which case it is called a
para photocycloaddition, with formation of bicyclo[2,2,2]oct-2-ene (or octa-2,5-dien) derivatives.
Source:
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 303
Cite as:
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
https://doi.org/10.1351/goldbook.
