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The three bidentate phosphorus baskets differ in the composition of the seven\u2010membered ring: one of the phosphorus atoms is flanked by CH<jats:sub>2<\/jats:sub>, NCH<jats:sub>3<\/jats:sub>, or O. The unsaturated tetrahydrophosphepine precursors are synthesized by either ring\u2010closing metathesis (C and N derivatives) or by a cyclization sequence (O derivative). The crystal structures of the nitrogen\u2010 (<jats:bold>19<\/jats:bold>) and oxygen\u2010containing (<jats:bold>20<\/jats:bold>) baskets have relatively small P\u2010Mo\u2010P angles of 76.240(13)\u00b0 and 77.626(12)\u00b0, respectively, and complex <jats:bold>20<\/jats:bold> has slightly shortened Mo\uf8ffP bond lengths.<\/jats:p>","DOI":"10.1002\/chem.200501531","type":"journal-article","created":{"date-parts":[[2006,3,10]],"date-time":"2006-03-10T06:21:09Z","timestamp":1141971669000},"page":"4333-4340","source":"Crossref","is-referenced-by-count":17,"title":["Bidentate Phosphorus Baskets by Intramolecular Phosphinidene Addition"],"prefix":"10.1002","volume":"12","author":[{"given":"Sander G. A.","family":"van Assema","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andreas W.","family":"Ehlers","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Frans J. 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