PETROLEUM

Is, for example (1) cyclohexadiene a separation product of petroleum, or is (2) barrelene a separation product of petroleum, or is (3) 1, 3-dimethylenecyclobutane a separation product of petroleum, or is (4) 1,3,5,7-tetramethylenecyclooctane a separation product of petroleum? Are these small 3-4 connected building block molecules separation components of the various petroleum grades? And are extended fragments of these building block monomers existent as separation components of petroleum? These are things that should be explored by petroleum chemists and coal chemists.