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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 ...
Magnesocene is a white solid at room temperature. [1] It has a melting point of 176 °C, though at atmospheric pressures it sublimes at 100 °C. [1] Unlike ferrocene, magnesocene displays slight dissociation and subsequent ion association in polar, electron-donating solvents (such as ether and THF).
Melting point: 32.5 °C (90.5 °F; 305.6 K) ... the steam cracking of naphtha and gas oils ... of neat cyclopentadiene at room temperature to form dicyclopentadiene ...
Its freezing point is −94 °C and its boiling point is 49 °C. Cyclopentane is in the class of cycloalkanes, being alkanes that have one or more carbon rings. It is formed by cracking cyclohexane in the presence of alumina at a high temperature and pressure. It was first prepared in 1893 by the German chemist Johannes Wislicenus. [5]
Well known derivatives containing pentadiene groups include hexadienes, cyclopentadiene, and especially three fatty acids linoleic acid, α-linolenic acid, and arachidonic acid as well as their triglycerides (fats).
Melting point: −135 °C (−211 °F; 138 K) Boiling point: ... It can also be produced by the catalytic hydrogenation of cyclopentadiene. [6] Reactions
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. [4] [5] Sodium hydride is a convenient base: [6] NaH + 2 C 5 H 6 → NaC 5 H 5 + H 2. In early work, Grignard reagents were used as bases.
Melting point: −80 °C (−112 °F; 193 K) Boiling point: 116 °C (241 °F; 389 K) ... Azulene – composed of fused cyclopentadiene and cycloheptatriene rings.