Chemoselective Thioacetalization Using 3-(1,3-Dithian-2-ylidene)pentane-2,4-dione as an Odorless and Efficient Propane-1,3-dithiol Equivalent under Solvent-Free Conditions - Ouyang, Yan; Dong, Dewen; Zheng, Chunbai; Yu, Haifeng; Liu, Qun; Fu, Zhenqian (Synthesis, 2006)