Tether-enforced reversal of regioselectivity: head-to-head [4+ 4] photocycloaddition of 2-pyridones
SMN Sieburth, B Siegel
Index: Sieburth, Scott McN.; Siegel, Brian Chemical Communications, 1996 , # 19 p. 2249 - 2250
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Abstract
Symmetric 3, 3′-attachment of a three-atom chain between two pyridones overrides the head-to-tail regioselectivity found in intermolecular photodimerization reactions and gives a nearly quantitative yield of the head-to-head [4+ 4] cycloadduct containing contiguous quaternary centres.
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