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Table 2 SmCl3 catalysed synthesis of 9-aryl-3,4,5,6,7,9-hexahydro-2H-xanthene-1,8-dione derivatives or its open chain form

From: A highly efficient green synthesis of 1, 8-dioxo-octahydroxanthenes

S.No Ar Product Time (min/h) Yield (%) Melting Point°C (3) Melting Point°C (4)
      Found Reported Found Reported
1 C6H5-(1a) 3a/4a 20/9 97/98 186-188 192-194 [35] 203-205 204-206 [36]
2 2-NO2-C6H5-(1b) 3b/4b 30/10 91/98 244-246 248-252 [24] 246-248 248-249 [36]
3 3-NO2- C6H5- (1c) 3c/4c 30/10 91/97 201-203 201-203 [35] 171-173 170-172 [36]
4 4-NO2- C6H5-(1d) 3d/4d 30/8 91/97 194-196 195-197 [35] 225-226 221-223 [36]
5 2-Br- C6H5-(1e) 3e/4e 25/8 97/98 238-240 241-243 [37] 226-229 226-229 [38]
6 2-Cl- C6H5-(1f) 3f/4f 20/8 95/98 200-202 202-204 [35] 230-232 225-227 [36]
7 4-Cl- C6H5-(1g) 3g/4g 20/9 95/97 142-144 145-147 [35] 230-233 229-230 [36]
8 4-CH3- C6H5-(1h) 3h/4h 30/8 95/98 139-141 141-143 [35] 212-214 210-211 [36]
9 4-OCH3- C6H5-(1i) 3i/4i 30/10 82/97 146-148 146-148 [35] 242-245 242-243 [39]
10 4-OH- C6H5-(1j) 3j/4j 30/9 88/98 188-190 201-203 [35] 244-246 247-248 [36]
11 4-OH,3-OCH3-C6H5-(1k) 3k/4k 15/8 94/98 193-195 193-195 [35] 227-228 224-225 [40]
12 3,4-OCH3-C6H5-(1l) 3l/4l 25/9 96/97 178-180 187-189 [35] 179-181 170-172 [40]
13 3,4,5-OCH3-C6H5-(1m) 3m/4m 15/10 93/98 203-205 205-208 [38] 186-188 182-183 [36]
14 3n/4n 20/24 93/20 139-141 142-144 [37] - -
15 C6H5CH = CH-(1o) 3o/4o 14/- 96/- 213-215 215-216 [6] - -