page_title: Organopalladium
section_title: Organopalladium chemistry timeline
hierarchical_section_title: Organopalladium / Organopalladium chemistry timeline
caption_attribution_description: English: PdCl2(cyclooctadiene)
context_page_description: Organopalladium chemistry is a branch of organometallic chemistry that deals with organic palladium compounds and their reactions. Palladium is often used as a catalyst in the reduction of alkenes and alkynes with hydrogen. This process involves the formation of a palladium-carbon covalent bond. Palladium is also prominent in carbon-carbon coupling reactions, as demonstrated in tandem reactions.
context_section_description: 1873 - A. N. Zaitsev reports reduction of benzophenone over palladium with hydrogen.
  1894 - Phillips reports that palladium(II) chloride reduces to palladium metal by contact with ethylene.
  1907 - Autoclave technology introduced by V. Ipatieff makes it possible to carry out high pressure hydrogenation.
  1956 - In the Wacker process  ethylene and oxygen react to acetaldehyde with catalyst PdCl₂/CuCl₂
  1957 - Tetrakis(triphenylphosphine)palladium(0) is reported by Malatesta and Angoletta.
  1972 - The Heck reaction  is a coupling reaction of a halogenide with an olefin. Pd(0) intermediates are implicated.
  1973 - The Trost asymmetric allylic alkylation is a nucleophilic substitution.
  1975 - The Sonogashira coupling is a coupling reaction of terminal alkynes with aryl or vinyl halides.
  1994 - The  Pd-catalyzed Buchwald-Hartwig amination for C-N bond-forming reactions.
caption: Sample of PdCl2(1,5-cyclooctadiene).
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