Abstract A series of stable anilinodimesitylboranes was synthesized. Their mass spectra and nuclear magnetic resonance spectra were studied. The photocyclization of these compounds in the presence of iodine is accompanied by a facile 1, 2-methyl migration. The structure of the products has been assigned on the basis of spectral evidence and degradation studies.
![7,9,10-trimethyl-6-mesityldibenz[ce][1,2]-azaborine Structure](https://image.chemsrc.com/caspic/139/42931-64-6.png)