Unusual Substitution in an Arsole Ring

CH3 83 170 400 (4.18) -CH,. 7.05 (s) 237 (4.25) aryl-H. 2.06-3.06 (m) The yellow-orange voluminous tert-butyl hypochlorite adducts (3) @=C,H,, CH,C,H,) resemble ( 4 ) in structure but do not decompose to the arsole oxides; however, they disproportionate in solution at room temperature to give (2). In the case of R = CH,C,H, the reaction proceeds further to give the I-chloroarsole (6) directly in 41 % yield.