DIFUNCTIONAL DERIVATIVES OF BIS(M-PHENYLENE)-32-CROWN-10

Optimization studies of the condensation of methyl 3,5-dihydroxybenzoa te (1) with tetra(ethylene glycol) dichloride (3) resulted in improvem ent of the yield of the 1 + 1 cyclization product, 5-carbomethoxy-m-ph enylene-16-crown-5 (5), to 67% (HPLC), but no improvement in the yield (28%, HPLC) of the desired 2 + 2 product, bis(5-carbomethoxy-m-phenyl ene)-32-crown-10 (4). However, after optimization, a two-step procedur e provided improved yields of 4 and this procedure was generalized to afford other difunctional monomers. Condensation of substituted resorc inols with 3 and subsequent transformations yielded substituted (R) 3, 5-bis(11-chloro-3,6,9-trioxaundecyl-oxy)benzene (7, 9-14). Reaction of dihalides 7 (R = COOCH3), 13 (R = CHO), and 12 (R = CH2OSi(Me)(2)-t-B u) with methyl 3,5-dihydroxybenzoate (1) produced bis(5-carbomethoxy-m -phenylene)-32-crown-10 (4) (43%), oxy-m-phenylene-5'-formyl-m'-phenyl ene-32-crown-10 (15) (32%), and the lactone (16a) (18%, derived from t he initially formed phenylene-5'-carbomethoxy-m'-phenylene-32-crown-10 (16)), respectively. Subsequent reactions gave the corresponding diac id (17), bis(hydroxymethyl) (19), bis(bromomethyl) (20), diacetyl (18) , diformyl (21), bis(p-nitrophenoxymethyl) (22), and di(acetoxymethyl) (23) derivatives.