R 3 3 2 July 8, 2019 16 32 64 128 R 3 )( 2r 3 R )- 3 bromo 2 3 dimethylpentane R 1 3 2 3 4 3 r 3 )=- 2 3 3 r )= 2r 4 R 3 27g 3 R - 3 R(3 3 3) R 3 3
