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Melting point: −90 °C; −130 °F; 183 K Boiling point: 39 to 43 °C; 102 to 109 °F; 312 to 316 K ... Cyclopentadiene is an organic compound with the formula C 5 ...
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
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: −135 °C (−211 °F; 138 K) Boiling point: ... It can also be produced by the catalytic hydrogenation of cyclopentadiene. [6] Reactions
2 Fe(CO) 5 + C 10 H 12 → (η 5-C 5 H 5) 2 Fe 2 (CO) 4 + 6 CO + H 2. In this preparation, dicyclopentadiene cracks to give cyclopentadiene, which reacts with Fe(CO) 5 with loss of CO. Thereafter, the pathways for the photochemical and thermal routes differ subtly but both entail formation of a hydride intermediate. [5] The method is used in ...
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.
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 ...
Tetraphenylcyclopentadienone is an organic compound with the formula (C 6 H 5 C) 4 C 4 C=O. It is classified as a cyclic dienone. It is a dark purple to black crystalline solid that is soluble in organic solvents. It is an easily made building block for many organic and organometallic compounds.