摘要:
The present invention relates to a process for the preparation of compounds of the formula (I) by reacting compounds of the formula (II) in which R1, R2, R4 and Het are as defined in the description, with anhydrous hydrogen halide in the presence of a nitrile.
摘要:
The present invention pertains to a process for the production of a specific crystal modification of a polymorphic, organic substance by precipitation of the specific crystal modification from the aqueous solution of the salt of the polymorphic substances using ordinary water-soluble organic solvents as additives as well as an acid or base.
摘要:
The present invention pertains to a process for the production of a specific crystal modification of a polymorphic, organic substance by precipitation of the specific crystal modification from the aqueous solution of the salt of the polymorphic substances using ordinary water-soluble organic solvents as additives as well as an acid or base.
摘要:
The invention relates to a novel process for preparing dimethyl cyanimidocarbonate (DCC, 3,3-dimethoxy-2-azaprop-2-enenitrile) from sodium cyanide, methanol, chlorine gas and cyanamide.