Copper(II) Bromide Catalyzed Novel Preparation of Propargylic Ethers and Sulfides by SN1-Type Substitution between Propargylic Alcohols and Alcohols or Thiols - Hui, Hao-hao; Zhao, Qin; Yang, Ming-yu; She, De-bing; Chen, Min; Huang, Guo-sheng (Synthesis, 2008)