Abstract
AbstractThiophthalic anhydride 1 reacts with the GRIGNARD reagents 2a–e (1:1 mol.) to give the corresponding 3‐aryl(alkyl)‐3‐hydroxy‐2‐thiophthalides 3a–e. The interaction of 1 with 2c and f (1:2 mol.) yields the corresponding 1,2‐diaroylbenzene derivatives 4. On the other hand, 1 reacts with 2b (1:2 and 1:3 mol.) to give 5 and 6, respectively.When 3‐benzal‐2‐thiophthalide 7a and 3‐p‐chlorobenzalphthalide 7b are allowed to react with the GRIGNARD reagents 2c–f, the corresponding indenone derivatives 8 are obtained. On the other hand, the reaction of 7a and b with 2b (1:2 mol.) yields 6 and 9, respectively. 7a and p‐methoxybenzalphthalide 7c react with 2b (1:1 mol.) to give 5 and 10 (a and b).The constitution of the products has been investigated by means of IR and UV spectra.
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