After scaling the data so the analysis is not dominated by the large amounts of 2-bromo-benzamide 1a and phenanthridinone 2a, PCA shows the distribution of side-products associated with different solvents (Fig. ). While DMF and propylene carbonate gave the greatest amount of product 2a, regardless of reaction time, Bu2O led to the most 1a remaining, with a slow but steady increase in product 2a with increasing reaction time (Fig. ). Other solvents, notably toluene, show a dependence on reaction time with most one-hour reactions in the centre of the plot. Bu2O and toluene have the lowest values of most products, except perhaps products 7a, 8a, 9a and 12a. As well as the major product 2a, DMF and propylene carbonate are likely to be associated with greater quantities of aniline 16a, and amides 5a and 6a.