trimethylenemethanes 

https://doi.org/10.1351/goldbook.T06500
The diradical CH2=C(C·H2)2, 2-methylenepropane-1,3-diyl, for which no Kekulé structure can be written, and its hydrocarbyl derivatives.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1373 [Terms] [Paper]
Citation: 'trimethylenemethanes' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.T06500 RIS BibTex EndNote
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Last revised: February 24, 2014