content_image/888414.jpg content_image/888413.jpg
Thereafter, 100 g of chloroform was added to the mixture, and the resultant organic phase was sequentially washed with water, a saturated aqueous sodium bicarbonate solution and water. The solvent was removed, thereby obtaining brown liquid compound (A-1-3). 

(Compound (A-1-3) was dissolved in 50 g of water, and 3.6 g of compound (A-1-4) was added to the aqueous solution and agitated for 30 minutes. Thereafter, 100 g of chloroform was added to the mixture, and the resultant organic phase was washed with water, thereby obtaining 3.3 g of brown liquid compound (A-1 ). 

The $^{1}$H-NMR analytical result of compound (A-1) is as follows. 

$^{1}$H-NMR (300 MHz, CDC1$_{3}$ ); 7.78-7.62 (m, 12H), 7.55 (d, 2H), 4.22 (m, 2H), 3.95 (d, lH), 3.76 (d, lH), 3.23 (m, lH), 3.13 (s, 2H), 3.04 (t, lH), 2.65 (t, lH), 2.40 (m, 4H), 1.82-1.55 (m, SH), 1.48-1.20 (m, 6H), 1.14-0.84 (m, 3H). 

<img src='content_image/888414.jpg'>

<img src='content_image/888413.jpg'>

Compounds (A-2) to (A-14) listed in Table 1 were syn› thesized through salt exchanges between sulfonium bromide and sodium sulfonate in the same manner as in the synthesis of compound (A-1). Table 1 also shows the structures of comparative compounds (Rl) to (R4) employed as com› parative examples. 

