Definitions for cyclobutadiene
cy·clobu·ta·di·ene

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1. cyclobutadienenoun

   The unsaturated cyclic hydrocarbon, CH that is the smallest annulene

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1. Cyclobutadiene

   Cyclobutadiene is an organic compound with the formula C4H4. It is very reactive owing to its tendency to dimerize. Although the parent compound has not been isolated, some substituted derivatives are robust and a single molecule of cyclobutadiene is quite stable. Since the compound degrades by a bimolecular process, the species can be observed by matrix isolation techniques at temperatures below 35 K. It is thought to adopt a rectangular structure.

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1. Cyclobutadiene

   Cyclobutadiene is the smallest [n]-annulene, an extremely unstable hydrocarbon having a lifetime shorter than five seconds in the free state. It has chemical formula C4H4. It is believed to be in equilibrium between a pair of homologous rectangular/nonplanar ground states and a square, excited triplet state based upon theoretical calculations, and through spectroscopic and crystallographic investigation of substituted cyclobutadienes, in an argon matrix and inside carceplexes. Though it has alternating single and double bonds, it is predicted triplet, unstable and antiaromatic by Hückel's rule, because its ring has 4 π-electrons, and 4 is not twice an odd number. Some cyclobutadiene–metal compounds are stable, thought to be caused by the metal atom providing 2 more electrons to the system. Nonplanar, rectangular distortion to a singlet ground state is caused by the Jahn–Teller effect. Tetra-t-butyl substituted cyclobutadiene is sufficiently stable to gather x-ray crystallographic images of the structure which has a distorted, nonplanar configuration and double bond lengths longer than normal 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. Recent studies on cyclobutadiene show that it has a rectangular structure as opposed to a square structure and two different 1,2-dideuterio-1,3-cyclobutadiene stereoisomers. This indicates that the pi electrons are localized and therefore not considered to be aromatic. However it is far from stable, it is highly reactive and has a very short lifetime. 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.

How to pronounce cyclobutadiene?

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Numerology

1. Chaldean Numerology

   The numerical value of cyclobutadiene in Chaldean Numerology is: 5

2. Pythagorean Numerology

   The numerical value of cyclobutadiene in Pythagorean Numerology is: 4

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Cyclobutadiene
2. ^ Wikipedia
   https://en.wikipedia.org/wiki/Cyclobutadiene
3. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=cyclobutadiene