1.
J Org Chem
; 78(5): 1833-43, 2013 Mar 01.
Article
in English
| MEDLINE
| ID: mdl-22827158
ABSTRACT
A new photoremovable protecting group, (6-hydroxy-3-oxo-3H-xanthen-9-yl)methyl (1), with a molar absorption coefficient ε of â¼4 × 10(4) m(-1) cm(-1) at â¼520 nm for the release of carboxylates or phosphates is reported. Three derivatives of 1 (diethyl phosphate, acetate, and bromide) were isolated as complexes with DDQ and shown to release the ligands with quantum yields ≤2.4% in aqueous solution.