... pre- pared following methods described in literature8–10 except 5-(p-di- methylaminophenyl)- 3-methylisoxazole (6) which had not been pre- viously synthesized. ... CH3 7 12 6 h + 16 h 30 min 76 C6H5 8 13 6 h + 14 h 30 min 91 p ... Table 2. Synthesis of the Phosphonium Salts ...