Figure 1, is supplied by Tokyo Chemical Industry (TCI).
Methylcyclohexane (CAS No. 108-87-2, >0.99 wt %) is
obtained from Aladdin Chemical Reagent Co. Ethylcyclohexane
(CAS No. 1678-91-7, >0.98 wt %) and butylcyclohexane (CAS
No. 1678-93-9, >0.99 wt %) are supplied by TCI. The purities
of the samples are checked by an Agilent 7890A/5975C GC-MS.
The specifications of these chemicals are listed in Table 1.