• Annulation reagent: Pure Appl. Chem., 9, 131 (1964); J. Am. Chem. Soc., 89, 5459 (1967). Reviews: Synthesis, 777 (1976); Tetrahedron, 32, 3 (1976).
• For similar annulations using higher homologues: Org. Synth. Coll., 6, 781 (1988).
• Review of the synthetic reactions of isoxazoles: Heterocycles, 12, 1343 (1979).