sentences:  The incipient thioketones and thioaldehydes undergo trimerization.One example is 2,2,4,4,6,6-hexamethyl-1,3,5-trithiane, or trithioacetone, the trimer of thioacetone (propane-2-thione).Alternatively 1,3,5-trithiane can be deprotonated and alkylated to afford (SCH2)n(SCHR)3-n.