... 27 mol%), a-aminopropanephosphonic acid (7, R = Et, &I 16.0, 61 mol %) and phosphorous acid (S ... MHz ('H, with TMS as internal standard) or 32 MHz (31P, with 85% phosphoric acid as ... 3. D. G. Cameron, HR Hudson and M. Pianka, Phosphorus, Sulfur and Silicon, 83.21 (1993 ...