3,4-diiodo-2,5-dimethylhexa-2,4-diene

1,1-dibromo-2,2-dimethyl-3-propan-2-ylidenecyclopropane

2,5-dichloro-2,5-dimethyl-3-hexyne

3,4-dilithio-2,5-dimethyl-2,4-hexadiene

1,2,3-butatriene-2-episulfide