... Recently tetrabutylammonium tribromide (TBATB), a stable orange crystalline solid has emerged as an efficient reagent for various organic transformations as reported by us 20 and by others. ... 8, p-N(CH 3 ) 2 C 6 H 4, H, 1.00, 81 d, 75 d. ... 11, p-(OBz)C 6 H 4, H, 1.00, 72, 68. ...