The plots are forced through the origin, with the gradient representing the response factor (RF) for each compound against n-dodecane. To obtain the composition of relevant reaction mixtures from these curves, a known mass of dodecane was added to the reaction mixture, an aliquot of which was then removed, diluted with EtOAc and analysed by GC-FID. The peak areas for each compound were then input into the following equation to obtain the moles of 6, 7, 8, 9 and bromoxylene: