Bradsher’s reagent

Cychdehydration. The sulfonic acid resin Ambcrlite-15 was found to be more satisfactory than Bradsher s reagent (2, 214), sulfuric acid, or formic acid for cyclo-dehydration of 2-methyl-4-phenyl-2-butanol (1) to 1,1-dimethylindane (2). ... 

Bradsher s reagent was found to be superior to PPA or a mixture of sulfuric acid-phosphoric acid for cyclodehydration of /1-hydroxy ketones of the type (4).21... 

A soln. of 4-hydroxy-4-methyl-5-phenyl-2-pentanone in 48%-HBr-glacial acetic acid heated 2 hrs. on a steam bath 1,3-dimethylnaphthalene. Y 87-90%. -The above mixture of HBr and acetic acid (Bradsher s reagent) gave higher yields than other acids. F. e. s. P. Ganonne, P. Holm, and L. G. Leitch, Gan. J. Ghem. 45, 2151 (1967). 

Bouveault-Blanc reduction, modified 16, 89 Bouveault-Locquin synthesis, improved 16, 230 Bradsher reagent 5, 642 V. Braun reaction 17, 625 Bridges s. a. Ethenylene bridges, Ring —... 

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