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We report the unexpected formation of a 1-azadiene dimer from 4,6-diphenyl-3,6-dihydro-2H-1,3-thiazine-2-thiones under prolonged microwave irradiation. In this manner, thiazine-2-thiones act as "masked" 1-azadiene equivalents, which makes them useful synthetic tools to access complex heterocyclic frameworks. We compare this dimerization with earlier approaches and elaborate on the observed diastereoselectivity. Abstract: We report the unexpected formation of a 1-azadiene dimer fromdoi:10.3390/molecules22040541 pmid:28350361 fatcat:vafnygplmnhk3nbhlhcfftkbjq