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] | - | - |
