Iodine catalyzed simple and efficient synthesis of 14-aryl or alkyl-14-H-dibenzo[a,j]xanthenes

Ferric hydrogensulfate catalyzed synthesis of aryl 14H-dibenzo[a,j] xanthene derivatives under thermal and solvent-free conditions

“…To show the merit of the present work in comparison with reported results in the literature, we compared results of ferric hydrogensulfate with p-toluenesulfonic acid, 19 iodine 21 and sulfamic acid 22 in the synthesis of aryl 14H-dibenzo[a,j]xanthene derivatives. As shown in Table 2, ferric hydrogensulfate can act as effective catalyst with respect to reaction times, yields and the obtained products (Table 2).…”

“…The solid product was purified by recrystallization procedure in aqueous EtOH (15%). The desired pure products were characterized by comparison of their physical data with those of known benzoxanthenes [17][18][19][20][21][22][23][24] The spectral data of some representative aryl 14H-dibenzo[a,j]xanthenes are given below: …”

Efficient one-pot synthesis of 14-aryl-14H-dibenzo[a,j]xanthene derivatives promoted by niobium pentachloride

“…In Table 3, the result obtained in this work (Entry 1) for the synthesis of 14-(4-chlorophenyl)-14H-dibenzo[a,j ]xanthene (VIe) is compared with other studies detailed in the literature (Khosropour et al, 2005;Das et al, 2006;Nagarapu et al, 2007;Dabiri et al, 2008aDabiri et al, , 2008bUrinda et al, 2009;Wang et al, 2010;Rahmatpour & Aalaie, 2011;Zolfigol et al, 2012). The results presented in Table 3 show that, regardless of the catalyst used, in the presence or absence of solvent, high temperatures are necessary to obtain good yields of xanthene VIe.…”

Aluminium hydrogensulfate as an efficient and heterogeneous catalyst for preparation of aryl 14H-dibenzo[a,j]xanthene derivatives under thermal and solvent-free conditions

“…To show the merit of the present work in comparison with reported results in the literature, we compared results of aluminium hydrogensulfate with toluenesulfonic acid, 19 iodine 22 and sulfamic acid 23 in the synthesis of aryl 14H-dibenzo[a,j]xanthene derivatives. As shown in Table 2, aluminium hydrogensulfate can act as effective catalyst with respect to reaction kinetic.…”