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Cyclopentadiene is a highly reactive diene in the Diels–Alder reaction because minimal distortion of the diene is required to achieve the envelope geometry of the transition state compared to other dienes. [11] Famously, cyclopentadiene dimerizes. The conversion occurs in hours at room temperature, but the monomer can be stored for days at ...
Melting point: −135 °C (−211 °F; 138 K) Boiling point: 44 to 46 °C (111 to 115 °F; 317 to 319 K) Hazards ... Cyclopentadiene Cyclobutene:
At temperatures above about 125 °C in the vapor phase, dissociation to cyclopentadiene monomer starts to become thermodynamically favored (the dissociation constant K d = [cyclopentadiene] 2 / [dicyclopentadiene] > 1). For instance, the values of K d at 149 °C and 195 °C were found to be 277 and 2200, respectively. [10]
Melting point: 104 °C (219 °F; 377 K) ... of hexachloronobornadiene with cyclopentadiene. [9] ... leads to the localization of the chemical compound in the air, ...
Cyclopentadienylthallium, also known as thallium cyclopentadienide, is an organothallium compound with formula C 5 H 5 Tl. This light yellow solid is insoluble in most organic solvents, but sublimes readily. It is used as a precursor to transition metal and main group cyclopentadienyl complexes, as well as organic cyclopentadiene derivatives. [1]
2 Na + 2 C 5 H 6 → 2 NaC 5 H 5 + H 2. The conversion can be conducted by heating a suspension of molten sodium in dicyclopentadiene. [2] In former times, the sodium was provided in the form of "sodium wire" or "sodium sand", a fine dispersion of sodium prepared by melting sodium in refluxing xylene and rapidly stirring.
Cyclopentadienylcobalt dicarbonyl is an organocobalt compound with formula (C 5 H 5)Co(CO) 2, abbreviated CpCo(CO) 2.It is an example of a half-sandwich complex.It is a dark red air sensitive liquid.
Substitution of all hydrogen atoms in arsole with phenyl groups yields yellow needles of crystalline pentaphenylarsole, which has a melting point of 215 °C. This complex can be prepared, at a yield of 50–93%, by reacting 1,4-diiodo-1,2,3,4-tetraphenylbutadiene [ 12 ] or 1,4-dilithio-1,2,3,4-tetraphenylbutadiene with phenylarsenous dichloride ...