RNH Ph--S-NHR O Pyridine R2NH Ph-S-CI Ph--S-NR RoN Ph-S一NR ①D ⑨D Ph-S-oh +rN H2OOrganic Chemistry Organic Chemistry Xiamen Xiamen University University R 3 N RNH 2 R 2NH + Py r idi n e Ph S NHR O Ph S NR 2 O S Cl O O Ph O O Ph S NR 3 O O H 2 O S OH + R 3 N O O Ph