C4是一類含有1個苯環和其餘4個碳原子的有機化合物。C4苯存在於石油中。[1]汽油中含有約5~8%的C4苯。[2]

參考文獻

  1. ^ Hill, Ronald J.; Lu, Shan-tan; Tang, Yongchun; Henry, Mitchell; Kaplan, Isaac R. C4-benzene and C4-naphthalene thermal maturity indicators for pyrolysates, oils and condensates. The Geochemical Society Special Publications. 2004, 9: 303–319. doi:10.1016/S1873-9881(04)80022-1. 
  2. ^ Kostecki, Paul T.; Calabrese, Edward J. Hydrocarbon Contaminated Soils. CRC Press. 1993: 217 [2018-02-22]. ISBN 9781566700184. (原始內容存檔於2018-01-31) (英語).