... Tetrahedron Letters. Volume 40, Issue 51, 17 December 1999, Pages 8971–8974. Cover image Cover image. ... Full Text via CrossRef. 2. BC Froehler; ,in: S. Agrawal (Ed.), Oligodeoxynucleotide Synthesis: H-Phosphonate Approach, Protocols for Oligonucleotides and Analogs, Vol ...