Chemical shifts are in parts per million the low field of 85% H, PO, or aqueous Hg (ClO,),(2 mmol of HgO/cm3 of 60% HClO,); coupling constants are in Hz; solvent, MeOH. determined from a'H-coupled lg9Hg NMR spectrum. PJ ('99Hg,'H)= 260, 3J ('99Hg,'H)= 300; coupling constants The t/d intensity ratio of 2 is nearly (due to different NOE) doubled compared with that of 1. methylene carbon is known only in a few The complexes were generated from ...