Baker, Caroline D. L. Fawcett, John Insley, Christopher D. Messenger, Derek S. Newland, Claire L. Overend, Helen L. Patel, Anup B. Shah, Mufakhrul Vara, Bhavna Virdee, Davinder Rawlings, Bernard J. Triol protection with 6-benzoyl-3,4-dihydro-(2H)-pyran. 6-Benzoyl-3,4-dihydro-(2H)-pyran will protect 1,2,3-triols such as glycerol as their corresponding spiro-[5-phenyl-3,6,8-trioxabicyclo[3.2.1]octane-4,2′-tetrahydropyran]s and 1,2,4-triols (less efficiently) as the corresponding trioxabicyclo[3.2.2]nonanes; the hexol mannitol is converted into the corresponding bis-protected product. IR content 2009-12-08
    https://figshare.le.ac.uk/articles/journal_contribution/Triol_protection_with_6-benzoyl-3_4-dihydro-_2H_-pyran_/10089851