). For instance, the values of Kd at 149 °C and 195 °C were found to be 277 and 2200, respectively. By extrapolation, Kd is on the order of 10–4 at 25 °C, and dissociation is disfavored. In accord with the negative values of ΔH° and ΔS° for the Diels–Alder reaction, dissociation of dicyclopentadiene is more thermodynamically favorable at high temperatures. Equilibrium constant measurements imply that ΔH° = –18 kcal/mol and ΔS° = –40 eu for cyclopentadiene dimerization. Dicyclopentadiene polymerizes. Copolymers are formed with ethylene or styrene. The "norbornene double bond" participates. Using ring-opening metathesis polymerization a homopolymer polydicyclopentadiene is formed. Hydroformylation of DCP gives the dialdehyde called TCD dialdehyde (TCD = tricyclodecane). This dialdehyde can be oxidized to the dicarboxylic acid and to a diol. All of these derivatives have some use in polymer science. Hydrogenation of dicyclopentadiene gives tetrahydrodicyclopentadiene, , which is a component of jet fuel JP-10, and rearranges to adamantane with aluminium chloride or acid at elevated temperature. References External links MSDS for dicyclopentadiene Inchem fact sheet for dicyclopentadiene CDC — NIOSH Pocket Guide to Chemical Hazards Cyclopentadienes Monomers Dimers (chemistry) Cyclopentenes