A. Misetic et Mk. Boyd, THE PIXYL (PX) GROUP - A NOVEL PHOTOCLEAVABLE PROTECTING GROUP FOR PRIMARY ALCOHOLS, Tetrahedron letters, 39(13), 1998, pp. 1653-1656
The 9-phenylxanthyl (pixyl or Px) moiety has been investigated as a po
tential photocleavable protecting group for primary alcohols. Alcohols
2a-e were protected in good yield by treatment with 9-chloro-9-phenyl
xanthene in dry pyridine at room temperature. Irradiation of the alcoh
ol derivatives in neutral aqueous acetonitrile regenerates 2a-e and th
e 9-phenylxanthyl alcohol. (C) 1998 Elsevier Science Ltd. All rights r
eserved.