Chemistry is the experimental and theoretical study of materials on their properties at both the macroscopic and microscopic levels.In a patent， name: (1R,2R)-Cyclohexane-1,2-diamine, Which mentioned a new discovery about 20439-47-8
Even if (±)-trans-1,2-diaminocyclohexane crystallizes as a conglomerate, its low melting point (-10 C) and its sensitivity to light, CO2, O2, and moisture make this molecule difficult to resolve. It has been shown that the citrate monohydrate of this compound crystallizes as a stable conglomerate with a high thermal stability (up to 163 C) with no drawbacks as to those listed above for the pure diamine. The crystal structure of this salt, resolved by single crystal X-ray diffraction, reveals structural features consistent with the thermal stability of this phase. Several preferential crystallization attempts (AS3PC) have been performed at a 100 ml scale and at a one liter scale in water with and without additives. Finally a productivity of 40 g per batch per liter of solvent per hour was achieved with a crude enantiomeric purity better than 90%. A simple recrystallization of the crude crops gives quantitatively the crystalline compound with an ee >99% proving the absence of partial solid solution at room temperature.
I hope this article can help some friends in scientific research. I am very proud of our efforts over the past few months and hope to 20439-47-8, help many people in the next few years.name: (1R,2R)-Cyclohexane-1,2-diamine
Reference：
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI