... Tetrahedron: Asymmetry. Volume 5, Issue 3, March 1994, Pages 351–354. Cover image Cover image. ... 2531–2533. 5; C. Herdeis, HP Hubmann; With 2c the lactone i was isolated. With Et 3 NHF/THF, deprotection was extremely slow see Tetrahedron: Asymmetry, 3 (1992), pp. ...