Studies on the Reaction of Diimines with Thiourea: Synthesis and Solvent-Induced cis/trans-Isomerization of 1,3,5-Triazinane-2-thiones

[摘要]：The reaction of N,N'-bis(arylmethylidene)arylmethane diimines with thiourea under reflux in methanol was studied. The reaction gave a diastereomeric Mixture of 4,6-disubstituted 1,3,5-triazinane-2-thiones in good yields. "two diastereoisomers of 4,6-diphenyl-1,3,5-triazinane-2-thione were detected ill a Solution Of CDCl3 by NMR analysis. According to the NMR Studies, the cis-diastereoisomer undergoes a solvent-induced cis/trans-isomerization process, producing the trans-diastereoisomer in DMSO. The stereochemistry of the trans-diastereoisomer was determined by Xray crystallographic analysis.

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