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The oxidative annulation proceeds with complete conversion of phosphinic acid derivatives and allowed the atom\u2010economic preparation of useful phosphaisocoumarins with high yield and selectivity. The reaction is tolerant of extensive substitution on the phosphinic acid, phosphonic monoester and alkyne, including halides, ketone, and hydroxyl groups as substituents. Furthermore, we found that alkenylphosphonic monoesters proceed to give a wide range of phosphorus 2\u2010pyrones through oxidative annulation with alkynes. Mechanistic studies revealed that C\uf8ffH bond metalation was the rate\u2010limiting step.<\/jats:p>","DOI":"10.1002\/chem.201302652","type":"journal-article","created":{"date-parts":[[2013,10,11]],"date-time":"2013-10-11T22:11:29Z","timestamp":1381529489000},"page":"16461-16468","source":"Crossref","is-referenced-by-count":73,"title":["Rhodium\u2010Catalyzed Oxidative C\u2013H Activation\/Cyclization for the Synthesis of Phosphaisocoumarins and Phosphorous 2\u2010Pyrones"],"prefix":"10.1002","volume":"19","author":[{"given":"Youngchul","family":"Park","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jungmin","family":"Seo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sangjune","family":"Park","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eun Jeong","family":"Yoo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Phil Ho","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,10,10]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja905444g"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja064017e"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1039\/a809398i"},{"key":"e_1_2_6_5_2","unstructured":"\u00a0"},{"key":"e_1_2_6_6_2","volume-title":"Phosphorus: The Carbon Copy","author":"Dillon K. 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