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In the presence of morpholin-4-amine, this transformation catalyzed by copper(\n                    <sc>i<\/sc>\n                    ) bromide proceeds through insertion of sulfur dioxide and intramolecular 5-\n                    <italic>endo<\/italic>\n                    cyclization, leading to benzo[\n                    <italic>b<\/italic>\n                    ]thiophene 1,1-dioxides in moderate to good yields.\n                  <\/p>","DOI":"10.1039\/c4cc07938h","type":"journal-article","created":{"date-parts":[[2014,10,30]],"date-time":"2014-10-30T10:03:52Z","timestamp":1414663432000},"page":"180-182","update-policy":"https:\/\/doi.org\/10.1039\/rsc_crossmark_policy","source":"Crossref","is-referenced-by-count":73,"title":["An unexpected reaction of 2-alkynylaryldiazonium tetrafluoroborate with sulfur dioxide"],"prefix":"10.1039","volume":"51","author":[{"given":"Yong","family":"Luo","sequence":"first","affiliation":[{"name":"Department of Chemistry"},{"name":"Fudan University"},{"name":"Shanghai 200433"},{"name":"China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Xiaolin","family":"Pan","sequence":"additional","affiliation":[{"name":"Department of Chemistry"},{"name":"Fudan University"},{"name":"Shanghai 200433"},{"name":"China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Chen","sequence":"additional","affiliation":[{"name":"Obstetrics and Gynecology Hospital"},{"name":"Fudan University"},{"name":"Shanghai 200011"},{"name":"China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liangqing","family":"Yao","sequence":"additional","affiliation":[{"name":"Obstetrics and Gynecology Hospital"},{"name":"Fudan University"},{"name":"Shanghai 200011"},{"name":"China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Chemistry"},{"name":"Fudan University"},{"name":"Shanghai 200433"},{"name":"China"},{"name":"State Key Laboratory of Organometallic Chemistry"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"292","published-online":{"date-parts":[[2015]]},"reference":[{"key":"C4CC07938H-(cit1a)\/*[position()=1]","doi-asserted-by":"crossref","first-page":"16372","DOI":"10.1021\/ja1081124","volume":"132","author":"Nguyen","year":"2010","journal-title":"J. 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