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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 ...
The (tert-butyl)cyclopentadiene is prepared by alkylation of cyclopentadiene with tert-butyl bromide in the presence of sodium hydride and dibenzo-18-crown-6. [1] The intermediate in this synthesis is di-tert-butylcyclopentadiene. This compound is conveniently prepared by alkylation of cyclobutadiene with tert-butyl bromide under phase-transfer ...
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Free response tests are a relatively effective test of higher-level reasoning, as the format requires test-takers to provide more of their reasoning in the answer than multiple choice questions. [4] Students, however, report higher levels of anxiety when taking essay questions as compared to short-response or multiple choice exams.
Pentacyanocyclopentadiene is a derivative of cyclopentadiene with five cyano groups with the molecular formula C 5 H(CN) 5. The corresponding anion, pentacyanocyclopentadienide, is a ligand with the molecular formula C 5 (CN) − 5. In contrast to other anions based on a C 5 ring unit it binds to metals through the pendant cyano groups rather ...
Di-tert-butylcyclopentadiene is an organic compound with the formula (Me 3 C) 2 C 5 H 4, where Me = methyl.It is a colorless liquid that is soluble in organic solvents. The compound is the conjugate acid of the di-tert-butylcyclopentadienyl ligand, (Me 3 C) 2 C 5 H 3 − [1] (sometimes abbreviated Cp ‡−).
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Fulvenes are readily prepared by the condensation of cyclopentadiene and aldehydes and ketones: C 5 H 6 + R 2 C=O → C 4 H 4 C=CR 2 + H 2 O. Johannes Thiele is credited with discovering this reaction. [4] [5] Modern synthesis of fulvenes employ buffer systems. [6] [7]