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Lett."},{"key":"ref15\/cit15","unstructured":"For the formation of 1,3-oxathiethanes by intramolecular cycloaddition, see:"},{"key":"ref15\/cit15a","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1039\/c39920000007","author":"Ishii A.","year":"1992","journal-title":"J. Chem. Soc., Chem. Commun."},{"key":"ref15\/cit15b","doi-asserted-by":"crossref","first-page":"829","DOI":"10.1002\/ange.19941060731","volume":"106","author":"Ishii A.","year":"1994","journal-title":"Angew. Chem."},{"key":"ref15\/cit15c","doi-asserted-by":"crossref","first-page":"509","DOI":"10.1246\/bcsj.70.509","volume":"70","author":"Ishii A.","year":"1997","journal-title":"Bull. Chem. Soc. Jpn."},{"key":"ref16\/cit16","unstructured":"For anab initiostudy of the [2 + 2] cycloaddition of X\u2550C\u2550Y molecules, see:"},{"key":"ref16\/cit16a","doi-asserted-by":"crossref","first-page":"207","DOI":"10.1021\/jp0522260","volume":"110","author":"Rode J. E.","year":"2006","journal-title":"J. Phys. Chem. A"},{"key":"ref17\/cit17","doi-asserted-by":"crossref","first-page":"167","DOI":"10.1002\/(SICI)1098-1071(1999)10:2<167::AID-HC11>3.0.CO;2-J","volume":"10","author":"von Criegern T.","year":"1999","journal-title":"Heteroat. Chem."},{"key":"ref18\/cit18","doi-asserted-by":"crossref","first-page":"2727","DOI":"10.1016\/j.tetlet.2010.03.042","volume":"51","author":"Ottersbach P. A.","year":"2010","journal-title":"Tetrahedron Lett."},{"key":"ref19\/cit19","doi-asserted-by":"crossref","first-page":"5255","DOI":"10.1021\/jo00148a006","volume":"47","author":"Jourdan G. P.","year":"1982","journal-title":"J. Org. Chem."},{"key":"ref20\/cit20","unstructured":"For examples to generate a dithiocarboxylic acid moiety with carbon disulfide, see:"},{"key":"ref20\/cit20a","doi-asserted-by":"crossref","first-page":"5519","DOI":"10.1016\/S0040-4039(00)75550-X","volume":"9","author":"Gompper R.","year":"1968","journal-title":"Tetrahedron Lett."},{"key":"ref20\/cit20b","doi-asserted-by":"crossref","first-page":"1727","DOI":"10.1021\/jo00976a011","volume":"37","author":"Bord\u00e1s B.","year":"1972","journal-title":"J. Org. Chem."},{"key":"ref20\/cit20c","first-page":"o387","volume":"61","author":"Yu Y.","year":"2005","journal-title":"Acta Crystallogr."},{"key":"ref21\/cit21","unstructured":"For decarboxylation and trapping with carbon disulfide to generate a dithiocarboxylate from pyridinium-2-carboxylates or 1,2-dimethylimidazolium-2-carboxylateviaanN-heterocyclic carbene, respectively, see:"},{"key":"ref21\/cit21a","doi-asserted-by":"crossref","first-page":"2167","DOI":"10.1039\/p19850002167","author":"Katritzky A. R.","year":"1985","journal-title":"J. Chem. Soc., Perkin Trans. 1"},{"key":"ref21\/cit21b","doi-asserted-by":"crossref","first-page":"287","DOI":"10.1039\/B716508K","volume":"6","author":"Schmidt A.","year":"2008","journal-title":"Org. Biomol. Chem."},{"key":"ref22\/cit22","doi-asserted-by":"crossref","first-page":"1902","DOI":"10.1021\/ic0012266","volume":"40","author":"Stueber D.","year":"2001","journal-title":"Inorg. 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