The 9-phenylxanthen-9-yl protecting group

@article{Chattopadhyaya1978The9P,
  title={The 9-phenylxanthen-9-yl protecting group},
  author={J. Chattopadhyaya and C. Reese},
  journal={Journal of The Chemical Society, Chemical Communications},
  year={1978},
  pages={639-640}
}
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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