Update index.mdx

docs/repo/details_standards/index.mdx

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 Chemical reactions and all other processes need to be described in a way that others with a basic domain knowledge can repeat the work. This means that each step of the work needs to be described sufficiently with all relevant details avoiding unusual or ambiguous abbreviations. All precisely measurable reaction parameters (e.g. weights, temperatures, durations etc.) need to be given in explicit numbers/values.
 
+If you **repeate a reaction** which you've already described previously, a proof of the obtained products in the form of ideally a 1H NMR and 13C NMR each is required. If 1H NMR is suiable for a clear identification and purity control of the product, then 1H NMR only is also sufficient. The analytical proof is expected to be gained from the repeated reaction itself (not from the originally published reaction and the products). 
+
+### How to distinguish new reactions from repetitions or versions? 
+**Reaction version**: not possible yet - coming soon
+**Repetition of a reaction**: A repetition of a reaction is a reaction that was conducted with the same components, e.g. reagents, reactants and products. The amounts and ratio of the components can be different if there is no influence on the reactions general outcome (= type of the obtained products). 
+Case 1: If a catalyst is added in a first reaction in 5 mol% and in the second reaction in 2 mol%, the new reaction can be considered as a repetition of the first reaction.
+Case 2: If two starting materials are added in the ratio 1:1 in a first reaction and in a second reaction they are added in a ratio of 2:1, them the second reaction is not a repetition of the first reaction and has to be considered as a new reaction. 
+Case 3: A typical repetition of a reaction is given, if the second reaction follows the same procedure without any changes with respect to the first reaction and gives a different yield due to changes in the purification process
+Case 4: Another typical repetition of a reaction is given, if the second reaction follows the same procedure with changed amounts of the components to perform the reaction on another scale. 
+**New own reaction**: A new reaction is everything that is not a reaction version or a reaction repetition and refers to the reactions of one single user or his collaborations. 
+
 ### Characterization of compounds
 
 **New compounds:** New compounds (not literature known compounds) must be provided