cyclobutadiene造句
例句与造句
- 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.
- It's difficult to find cyclobutadiene in a sentence. 用cyclobutadiene造句挺难的
- These include cyclobutadiene derivatives, ferroles " of the formula Fe 2 ( C 4 R 4 ) ( CO ) 6, as well as cyclopentadienone and cyclobutadiene derivatives.
- Some annulenes, namely cyclobutadiene, cyclodecapentaene or [ 10 ] annulene, cyclododecahexaene or [ 12 ] annulene and cyclotetradecaheptaene ( [ 14 ] annulene ), are unstable, with cyclobutadiene extremely so.
- Some annulenes, namely cyclobutadiene, cyclodecapentaene or [ 10 ] annulene, cyclododecahexaene or [ 12 ] annulene and cyclotetradecaheptaene ( [ 14 ] annulene ), are unstable, with cyclobutadiene extremely so.
- Cyclobutadiene also lends itself to a [ 2 + 2 + 1 ] cycloaddition although this reactant is generated in situ from decomplexation of stable cyclobutadiene iron tricarbonyl with ceric ammonium nitrate ( CAN ).
- Cyclobutadiene also lends itself to a [ 2 + 2 + 1 ] cycloaddition although this reactant is generated in situ from decomplexation of stable cyclobutadiene iron tricarbonyl with ceric ammonium nitrate ( CAN ).
- Whereas benzene is aromatic ( 6 electrons, from 3 double bonds ), cyclobutadiene is antiaromatic, since the number of ? delocalized electrons is 4, which of course is a multiple of 4.
- The pi electron energy of cyclobutadiene is higher than that of its open-chain counterpart, 1, 3-butadiene, and it is therefore said to be anti-aromatic rather than " aromatic ".
- At this point of time, it is presumed that cyclobutadiene will continue to be used to introduce the concept of antiaromaticity in textbooks as a matter of convenience, even though classifying it as antiaromatic technically may not be accurate.
- Recent studies have determined that cyclobutadiene adopts an asymmetric, rectangular configuration in which single and double bonds indeed alternate, with no resonance; the single bonds are markedly longer than the double bonds, reducing unfavorable p-orbital overlap.
- Many aromatic and antiaromatic compounds ( benzene and cyclobutadiene ) are too small to have protons inside of the ring, where shielding and deshielding effects can be more diagnostically useful in determining if a compound is aromatic, antiaromatic, or nonaromatic.
