cyclobutadiene造句

• Cyclobutadiene is particularly destabilized and this was originally attributed to antiaromaticity.
• The electronic states of cyclobutadiene have been explored with a variety of computational methods.
• They are liable to dimerization to cyclobutadiene compounds or react with oxygen to epoxides.
• Cyclobutadiene is far from stable, it is highly reactive and has a very short lifetime.
• Though the benzene ring is stabilized by aromaticity, the cyclobutadiene portion has a destabilizing effect.
• The first three annulenes are cyclobutadiene, benzene, and cyclooctatetraene ( [ 8 ] annulene ).
• Next, Grubbs attended Columbia University, where he worked with Ronald Breslow on the antiaromaticity of cyclobutadiene.
• One cyclobutadiene derivative is also accessible through a [ 2 + 2 ] cycloaddition of a di-alkyne.
• In the same year Pettit who synthesised cyclobutadiene a few years earlier independently came up with a competing mechanism.
• He searched for ways of obtaining cyclobutadiene, while explaining the chemistry of this unstable substance and isolating its dimers.
• However, it has long been questioned if cyclobutadiene is genuinely antiaromatic and recent discoveries have suggested that it may not be.
• It has been used in organic chemistry as a precursor for cyclobutadiene, which is an elusive species in the free state.
• The rectangular structure is consistent with the existence of two different 1, 2-dideutero-1, 3-cyclobutadiene stereoisomers.
• Cyclobutadiene ( C 4 H 4 ) with four pi electrons is stable only at temperatures below 35 K and is rectangular rather than square.
• "' Benzocyclobutadiene "'is the simplest polycyclic aromatic hydrocarbon, being composed of a benzene ring fused to a cyclobutadiene ring.
• Hence, cyclobutadiene is non-aromatic; the strain of the asymmetric configuration outweighs the anti-aromatic destabilization that would afflict the symmetric, square configuration.
• An improved synthesis of tetra ( trimethylsilyl ) tetrahedrane has been reported, by one-electron reduction of the cyclobutadiene precursor with tris ( pentafluorophenyl ) borane.
• The prototypical example of antiaromaticity, cyclobutadiene, is the subject of debate, with some scientists arguing that antiaromaticity is not a major factor contributing to its destabilization.
• Cyclobutadiene dimerizes by a Diels-Alder reaction at 35 K . The monomeric form has been studied at higher temperatures by trapping with matrix isolation in a noble gas.
• These include cyclobutadiene derivatives, ferroles " of the formula Fe 2 ( C 4 R 4 ) ( CO ) 6, as well as cyclopentadienone and cyclobutadiene derivatives.