e.g. Filippa Pettersson or Cancer Res. 75(6) , 1102-12, (2015) or 10.1002/anie.201600521
Russian journal of general chemistry
Diazo reactions with unsaturated compounds: VIII. Reaction of 1, 3-butadiene and isoprene with aromatic and aliphatic-aromatic triazenes in the presence of sulfur (IV) …
VM Naidan, VV Smalius
Index: Naidan; Smalius Russian Journal of General Chemistry, 2004 , vol. 74, # 9 p. 1386 - 1388
Abstract 1, 3-Butadiene and 2-methyl-1, 3-butadiene react with 1, 3-diphenyltriazene, 1, 3-di- p-tolyltriazene, and 1-aryl-3, 3-dimethyl-1-triazenes in a sulfur (IV) oxide-saturated water- acetic acid-acetone solution containing NaCl or hydrochloric acid, and catalytic amounts of copper (I) chloride to form 1, 4-arylsulfonyl-chlorination products.