By YUSUF AHMAD, M. S. HABIB, M. IQBAL, and M. IKRAM QURESHI. THE rapid isomerisation of anilides (Ia-c) in concentrated sulphuric acid at 0" to the corresponding spiroindoles (IIa-c) has been attributedl to the presence of a strong electrophilic centre at position 2. However, the derivatives (Id-j) of 3,4-dihydro-6,7-dimet hoxy-(or 6,7-dimethyl-) -2-(N-phenylcarbamo yl) -3-oxoquinoxaline, when treated with cold concentrated sulphuric acid at room temperature, were recovered unchanged. This was expected as the presence of the electron-releasing substituents would make position 2 less electrophilic. The intramolecular rearrangement of the anilides (Ie-i and 111; R = Me) to the corresponding spiroindoles (IIe-i and IV; R = Me) was achieved Cl,H13N304 requires N, 15.9%).