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karbeenid, mille karbeense süsiniku aatom on seotud vinüülrühmaga: R2C=CRC:R↔R2C+–CR=C−R, nt H2C=CHC:H prop-2-een-1-ülideen, carbenes having a vinylic group on a carbenic carbon atom R2C=CRC:R↔R2C+–CR=C−R . E.g. H2C=CHC:H prop-2-en-1-ylidene