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T.","year":"1993","journal-title":"Tetrahedron Lett."},{"key":"ref11\/cit11","unstructured":"Review:"},{"key":"ref11\/cit11a","doi-asserted-by":"crossref","first-page":"1293","DOI":"10.1021\/cr00037a008","volume":"95","author":"Masse C. E.","year":"1995","journal-title":"Chem. Rev."},{"key":"ref11\/cit11b","doi-asserted-by":"crossref","first-page":"3122","DOI":"10.1021\/ja809873u","volume":"131","author":"Parsons A. T.","year":"2009","journal-title":"J. Am. Chem. Soc."},{"key":"ref11\/cit11c","doi-asserted-by":"crossref","first-page":"8035","DOI":"10.1021\/jo0511290","volume":"70","author":"Mertz E.","year":"2005","journal-title":"J. Org. Chem."},{"key":"ref11\/cit11d","doi-asserted-by":"crossref","first-page":"3687","DOI":"10.1002\/anie.200351240","volume":"42","author":"Gans\u00e4uer A.","year":"2003","journal-title":"Angew. Chem., Int. 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Soc."},{"key":"ref13\/cit13","doi-asserted-by":"crossref","first-page":"3893","DOI":"10.1002\/1099-0690(200012)2000:23<3893::AID-EJOC3893>3.0.CO;2-E","author":"Schmitt A.","year":"2000","journal-title":"Eur. J. Org. Chem."},{"key":"ref14\/cit14a","doi-asserted-by":"crossref","first-page":"1195","DOI":"10.1039\/b600056h","volume":"7","author":"Smith D. M.","year":"2006","journal-title":"Org. Biomol. Chem."},{"key":"ref14\/cit14b","doi-asserted-by":"crossref","first-page":"10879","DOI":"10.1021\/ja0524043","volume":"127","author":"Larsen C. H.","year":"2005","journal-title":"J. Am. Chem. Soc."},{"key":"ref15\/cit15","unstructured":"See page 10881 of ref14b."},{"key":"ref16\/cit16","unstructured":"See page 3894 of ref13."},{"key":"ref17\/cit17","unstructured":"For a review, see ref3. Selected recent examples:"},{"key":"ref17\/cit17a","doi-asserted-by":"crossref","first-page":"2869","DOI":"10.1002\/anie.200705340","volume":"47","author":"Donohoe T. J.","year":"2008","journal-title":"Angew. Chem., Int. Ed."},{"key":"ref17\/cit17b","doi-asserted-by":"crossref","first-page":"583","DOI":"10.1590\/S0103-50532008000300030","volume":"19","author":"Pilli R. A.","year":"2008","journal-title":"J. Braz. Chem. Soc."},{"key":"ref17\/cit17c","doi-asserted-by":"crossref","first-page":"3532","DOI":"10.1039\/b804588g","volume":"6","author":"Menendez Perez B.","year":"2008","journal-title":"Org. Biomol. Chem."},{"key":"ref17\/cit17d","doi-asserted-by":"crossref","first-page":"170","DOI":"10.1021\/jo801803m","volume":"74","author":"Fernandez de la Pradilla R.","year":"2009","journal-title":"J. Org. Chem."},{"key":"ref17\/cit17e","doi-asserted-by":"crossref","first-page":"960","DOI":"10.1016\/j.tetlet.2008.12.040","volume":"50","author":"Menendez Perez B.","year":"2009","journal-title":"Tetrahedron Lett."},{"key":"ref17\/cit17f","doi-asserted-by":"crossref","first-page":"378","DOI":"10.1002\/ejoc.200800907","author":"Jalce G.","year":"2009","journal-title":"Eur. J. Org. Chem."},{"key":"ref17\/cit17g","doi-asserted-by":"crossref","first-page":"2209","DOI":"10.1021\/ol900594h","volume":"11","author":"Ward A. F.","year":"2009","journal-title":"Org. Lett."},{"key":"ref18\/cit18a","doi-asserted-by":"crossref","first-page":"9245","DOI":"10.1016\/S0040-4020(99)00480-9","volume":"55","author":"Jaouen V.","year":"1999","journal-title":"Tetrahedron"},{"key":"ref18\/cit18b","unstructured":"bMore substituted cases may be less selective:"},{"key":"ref18\/cit18bb","doi-asserted-by":"crossref","first-page":"3523","DOI":"10.1002\/1099-0690(200011)2000:21<3523::AID-EJOC3523>3.0.CO;2-C","author":"Kovensky J.","year":"2000","journal-title":"Eur. J. Org. Chem."},{"key":"ref19\/cit19","unstructured":"For relevant computational studies, see:"},{"key":"ref19\/cit19a","doi-asserted-by":"crossref","first-page":"2823","DOI":"10.1002\/hlca.200590224","volume":"88","author":"Nokami T.","year":"2005","journal-title":"Helv. Chim. Acta"},{"key":"ref20\/cit20a","doi-asserted-by":"crossref","first-page":"655","DOI":"10.1021\/ja00836a038","volume":"97","author":"Hall H. K. Jr.","year":"1975","journal-title":"J. Am. Chem. Soc."},{"key":"ref20\/cit20b","doi-asserted-by":"crossref","first-page":"101","DOI":"10.1002\/polc.5070560112","volume":"56","author":"Hall H. K.","year":"1976","journal-title":"J. Polym. Sci. Polym. Symp."},{"key":"ref21\/cit21","unstructured":"Enhanced reactivity of1suggests that the range of conditions suitable for initiation of its reactions (i.e., combinations of Lewis acids and nucleophiles) might be broader than for other types of acetals."},{"key":"ref22\/cit22","doi-asserted-by":"crossref","first-page":"4013","DOI":"10.1021\/jm970066d","volume":"40","author":"Bakina E.","year":"1997","journal-title":"J. Med. Chem."},{"key":"ref23\/cit23","unstructured":"Diol3has also been prepared in enantiomerically enriched form."},{"key":"ref23\/cit23a","doi-asserted-by":"crossref","first-page":"8603","DOI":"10.1016\/S0040-4020(01)85335-7","volume":"50","author":"Raifeld Y. E.","year":"1994","journal-title":"Tetrahedron"},{"key":"ref24\/cit24","unstructured":"Hall reported a yield of 85% of1using lower pressure and mechanical stirring. See ref20b."},{"key":"ref25\/cit25","unstructured":"Compounds4a,4b, and4ewere identified by comparison to literature data."},{"key":"ref25\/cit25a","doi-asserted-by":"crossref","first-page":"3675","DOI":"10.1016\/S0957-4166(00)00351-7","volume":"11","author":"Pilli R. A.","year":"2000","journal-title":"Tetrahedron: Asymmetry"},{"key":"ref25\/cit25b","doi-asserted-by":"crossref","first-page":"3251","DOI":"10.1002\/ejoc.200600209","author":"Freifeld I.","year":"2006","journal-title":"Eur. J. Org. Chem."},{"key":"ref25\/cit25ba","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1016\/S0040-4020(01)80520-2","volume":"49","author":"Bunn B. J.","year":"1993","journal-title":"Tetrahedron"},{"key":"ref25\/cit25bb","doi-asserted-by":"crossref","first-page":"4143","DOI":"10.1016\/S0040-4020(01)86451-6","volume":"47","author":"Iqbal J.","year":"1991","journal-title":"Tetrahedron"},{"key":"ref25\/cit25c","doi-asserted-by":"crossref","first-page":"8329","DOI":"10.1016\/j.tet.2004.07.032","volume":"60","author":"Chakraborty T. K.","year":"2004","journal-title":"Tetrahedron"},{"key":"ref26\/cit26a","doi-asserted-by":"crossref","first-page":"6107","DOI":"10.1021\/jo00312a015","volume":"55","author":"Mori I.","year":"1990","journal-title":"J. Org. Chem."},{"key":"ref26\/cit26b","doi-asserted-by":"crossref","first-page":"8089","DOI":"10.1021\/ja00021a040","volume":"113","author":"Denmark S. E.","year":"1991","journal-title":"J. Am. Chem. Soc."},{"key":"ref26\/cit26c","doi-asserted-by":"crossref","first-page":"7915","DOI":"10.1021\/ja00096a066","volume":"116","author":"Sammakia T.","year":"1994","journal-title":"J. Am. Chem. Soc."},{"key":"ref27\/cit27","unstructured":"For discussions of the role of ion-pairing on stereocontrol in additions to cyclic oxocarbenium ions, see:"},{"key":"ref27\/cit27a","doi-asserted-by":"crossref","first-page":"4907","DOI":"10.1021\/ol8019956","volume":"10","author":"Krumper J. R.","year":"2008","journal-title":"Org. Lett."},{"key":"ref27\/cit27b","doi-asserted-by":"crossref","first-page":"1157","DOI":"10.1021\/ol0500620","volume":"7","author":"Shenoy S. R.","year":"2005","journal-title":"Org. Lett."},{"key":"ref27\/cit27c","doi-asserted-by":"crossref","first-page":"9720","DOI":"10.1021\/ja026972j","volume":"124","author":"Zhang Y.","year":"2002","journal-title":"J. Am. Chem. Soc."},{"key":"ref28\/cit28a","doi-asserted-by":"crossref","first-page":"514","DOI":"10.1002\/anie.200352128","volume":"43","author":"Braun M.","year":"2004","journal-title":"Angew Chem., Int. Ed."},{"key":"ref28\/cit28b","doi-asserted-by":"crossref","first-page":"7198","DOI":"10.1021\/ja801514m","volume":"130","author":"Reisman S. E.","year":"2008","journal-title":"J. Am. Chem. Soc."},{"key":"ref29\/cit29","unstructured":"The SN1-like mechanism has been invoked for both TMSOTf and BF3\u00b7OEt2in the reaction of acyclic chiral acetals with allylsilane reagents."},{"key":"ref29\/cit29a","doi-asserted-by":"crossref","first-page":"4541","DOI":"10.1021\/ja970153v","volume":"119","author":"Matsutani H.","year":"1997","journal-title":"J. Am. Chem. Soc."},{"key":"ref29\/cit29b","doi-asserted-by":"crossref","first-page":"1929","DOI":"10.1039\/a904608i","author":"Manju K.","year":"1999","journal-title":"Chem. 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