Journal
KINETICS AND CATALYSIS
Volume 50, Issue 5, Pages 734-740Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0023158409050152
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Funding
- National Academy of Sciences of Ukraine [0101U08137]
- Ministry of Education and Science of Ukraine [0103I003614]
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The catalyst for acetylene hydrochlorination with gaseous HCl at room temperature is prepared by mechanical pretreatment of K2PdCl4 in an acetylene atmosphere. The rate-determining step of the reaction is the chloropalladation of pi-coordinated acetylene involving an HCl molecule. As a consequence, the replacement of HCl with DCl brings about a kinetic isotope effect of 2.8 +/- 0.4, which differs substantially from that observed in the protodemetalation of the intermediate palladium(II) chlorovinyl derivative yielding vinyl chloride (6.8 +/- 0.6).
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