1,2-Substituted biguanides of the formula ##EQU1## wherein R.sub.1 is saturated or unsaturated, straight-chain or branched hydrocarbon of 1-12 carbon atoms which is unsubstituted or substituted by one or more fluorine atoms; a cycloalkyl group of 3-6 carbon atoms; or an aryl or aralkyl group of the formula ##SPC1## With n being the integer 0, 1 or 2 and X being hydrogen or halogen; and R'.sub.1 is a hydrogen atom or a saturated or unsaturated, straight-chain or branched hydrocarbon group of 1-12 carbon atoms; or R.sub.1 and R'.sub.1 collectively with the nitrogen atom to which they are attached are a heterocyclic ring containing one or more hetero atoms; and R.sub.2 is saturated or unsaturated, straight-chain or branched hydrocarbon of 1-12 carbon atoms which is unsubstituted or substituted by one or more fluorine atoms; or cycloalkyl of 3-6 carbon atoms, alkoxyalkyl containing a total of 2-12 carbon atoms, or alkoxy of 1-6 atoms; mixtures thereof, and pharmaceutically acceptable acid addition salts thereof, are useful in the treatment of diabetes mellitus.
Selon l'invention, on fait réagir le phosgène sur un mercaptan en présence d'un catalyseur de formule générale :
où X = O ou S et où les R1, R2, R3, R4 sont notamment des groupes aliphatiques, cycloaliphatiques ou aromatiques ou un atome d'hydrogène. Le taux de catalyseur est de 0, 1 à 10% en moles par rapport au mercaptan et la réaction s'effectue à température ambiante et à la pression atmosphérique. Le procédé, qui peut être rendu continu, conduit à des temps de séjours courts et à un rendement et une pureté élevés.
Les thiochloroformiates trouvent essentiellement leur application comme intermédiaires de synthèse de composés herbicides.
根据本发明,光气与硫醇在通式为 :
其中 X = O 或 S,R1、R2、R3、R4 尤其是脂肪族、环脂族或芳香族基团或氢原子。催化剂含量为硫醇的 0.1 至 10 摩尔%,反应在环境温度和大气压力下进行。该工艺可连续进行,停留时间短,产量和纯度高。
硫代氯甲酸酯主要用作合成除草化合物的中间体。
Techniques regarding catalyzing one or more ring-opening polymerizations within one or more flow reactors using one or more organometallic bases are provided. For example, one or more embodiments described herein can comprise a method, which can include forming a polymer, via a ring-opening polymerization within a flow reactor, from a cyclic monomer in the presence of an organometallic base and a primary alcohol initiator.