Fulvalenes

{
  "id": "MLC-T-CHM-004701",
  "term": "Fulvalenes",
  "field": "Chemistry",
  "definition": "Hydrocarbons made of two rings joined by a carbon-carbon double bond that is exocyclic to both, the parent being fulvalene, C10H8, with two five-membered rings, together with substituted and heteroatom analogues named by prefixing the ring sizes, as in heptafulvalene. They are cross-conjugated rather than aromatic. Tetrathiafulvalene, in which sulfur replaces ring carbons, is a classic electron donor in organic conductors.",
  "subject": "Organic and Biomolecular Chemistry",
  "references": [
    "PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1336 (https://doi.org/10.1351/pac199567081307)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/fulvalenes/"
}