A　series　of　phenols　have　been　used　to　react　with　ferrocenyl　cinnamic　acid,　and　the　results　of　1H　NMR　and　crystal　structures　have　shown　that　only　resorcinol　and　2-naphthalenol　can　get　ring　closure　products,　while　the　others　only　get　esterified　products.　This　is　because　resorcinol　and　2-　naphthalenol　have　higher　electronic　density　in　ortho-site　of　hydroxyl　than　other　phenols　used　in　this　work.　Ten　ferrocenyl　dihydroquinolin-2(1H)-ones　are　synthesized　by　hydroarylation　of　ferrocenyl　acrylic　amides　in　the　presence　of　TFA,　and　an　interpretation　is　also　given　to　the　experimental　fact　that　strong　acid　can　not　catalyze　hydroarylation　of　acrylic　anilides　to　dihydroquinolones.　©　ARKAT-USA,　Inc.