| abstract |
A composition comprising a fuel and at least one compound characterized by Formula I: n nwherein X is carbon, oxygen, or sulfur; R 1 and R 2 each independently are hydrogen, a C 1 to C 20 alkyl, or a C 6 to C 10 aryl; R 3 and R 3′ each independently are hydrogen or a C 1 to C 4 alkyl; R 4 and R 4′ each independently are hydrogen, a C 1 to C 4 alkyl, a C 4 to C 10 cycloalkyl, or a C 6 to C 10 aryl; R 5 and R 5′ each independently are a C 4 to C 10 alkyl; R 6 and R 6′ each independently are hydrogen or a C 1 to C 6 alkyl; and R 7 and R 7′ each independently are hydrogen or a C 1 to C 4 alkyl; and wherein the compound of Formula I when subjected to GC-MS using electron ionization at greater than about 70 eV produces at least one ion having a mass-to-charge ratio of from 300 to 600. |