
Entry^a	ArN=O	X	Ar-C(O)C≡CH or Hetar-C(O)C≡CH	Ar or Het	R	Prod.	Yield (%)
1	1a	4-NO₂	19a		H	20	15^b
2	1a	4-NO₂	19b		OH	21	22^c
3	1a	4-NO₂	19c		OH	22	32^c^,d
4 5	1a 1b	4-NO₂ 4-COOH	19d 19d		OH OH	23 24	41^c 64^d^,e
6	1b	4-COOH	19e		OH	25	16^b^,e
7 8	1b 1c	4-COOH 4-CN	19f 19f		H H	26 27	37^e^,f 39^b
9 10	1d 1i 1i	4-Br H H	19g 19g 19g		H OH H	28 29 30	37^c 38^b 17^b
11 12 13	1a 1h 1i	4-NO₂ 2-NO₂ H	19h 19h 19h		H H H	31 32 33	30^b 45^b 32^b
14	1b	4-COOH	19i		OH	34	50^d^,e
15 16 17	1a 1i 1j	4-NO₂ H 2-COOCH₃	19j 19j 19j		OH H OH	35 36 37	50^c 53^b 24^c
18	1a	4-NO₂	19k		H	38	not isolated^g