... Tetrahedron Letters. Volume 54, Issue 9, 27 February 2013, Pages 1063–1066. Cover image Cover image. ... This Letter presents a facile alternative synthesis of a recoverable Au(III) catalyst supported on Fe 3 O 4 @SiO 2 ∼MPS grafted by poly(N-vinyl-2-pyrrolidone) (PVP). ...