NEW MATERIAL:A 1,3-dithian shown by the formula[R1 is di-substituted amino; at least one of R2 and R3 is electron attractive group, and the other is H, (substituted)hydrocarbon, heterocyclic, or at least one of R2 and R3 is CO and together with neighboring C forms spiro ring; X1 and X2 are (oxidized)S] and its salt. EXMPLE:2,2-Diethoxycarbonyl-5-(N,N-dimethylamino)1,3-dithian. USE:A safe insecticide having low toxicity to plants, men and beasts, and fishes. PROCESS:For example, a compound shown by the formula R1CH(CH2SSO2R4)2 (R4 is hydrocarbon, or OH) is reacted with a compound shown by the formula R2'CH2R3' (R2' and R3' are as defined for R2 and R3 but not H) in a solvent such as preferably methanol, etc. in the presence of a base such as pyridine, etc., to give a compound shown by the formula (with the proviso that R2 and R3 are as shown for R2' and R3').
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机译：新材料：式[R 1]所示的1，3-二噻吩基是二取代氨基; R 2和R 3中的至少一个是吸电子基团，另一个是H，（取代的）烃基，杂环，或者R 2和R 3的至少一个是CO并且与相邻的C形成螺环; X 1和X 2是（被氧化的）S]及其盐。实施例：2，2-二乙氧基羰基-5-（N，N-二甲基氨基）1，3-二乙胺。用途：一种安全的杀虫剂，对植物，人和野兽以及鱼类均具有低毒性。方法：例如，使式R 1 CH（CH 2 SSO 2 R 4）2（R 4为烃或OH）所示的化合物与式R 2'CH 2 R 2所示的化合物反应在诸如甲醇的溶剂中，优选在诸如甲醇等的存在下，3′（R 2′和R 3′如对R 2和R 3的定义，但不对H定义）。吡啶等，得到下式所示的化合物（条件是R 2和R 3如R 2'和R 3'所示）。
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