9-Chloro-9-phenylxanthene (4b) reacts with the 5′-hydroxy groups of 2′-deoxyribonucleosides (2)(and their N-acyl derivatives) to give crystalline 9-phenylxanthen-9-yl (pixyl) derivatives (5) in satisfactory to good yields; the pixyl group may be removed by acidic hydrolysis under very mild conditions.
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Chattopadhyaya et al. (1978) studied this question.
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