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[3.3.0.02,8
]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.
PAC, 2007, 79, 293
(Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006))
on page 303
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