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X-ray diffraction data for 2a and 2i have been deposited in the Cambridge Crystallographic Data Centre with supplementary publication numbers of CCDC 299096 (2a) and 603091 (2i). The CIF files are also available in the Supporting Information.
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1H NMR spectrum of 2a-D indicates that the methylene group is deuterated during the intramolecular thia-anti-Michael addition process.
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