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Excellent enantioselectivity (up to 96 % ee) was attained in an antibody-catalyzed photochemical Norrish type II reaction, which proceeded via the intermediate diradical 1 to produce the cyclobutanols 4 (absolute stereochemistry unknown). Use of the antibody was shown to alter the course of the reaction by favoring formation of the cyclization product 4 over the fragmentation products 2 and 3.
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Saphier et al. (2003) studied this question.
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