Tabushi, Iwao’s team published research in Journal of the American Chemical Society in 1980 | CAS: 34352-59-5

1-Methylpiperazine dihydrochloride(cas: 34352-59-5) is used in the preparation of 2-(4-Methyl-1-piperazinylmethyl)acrylophenone(MPMAP), 1-methylpiperazine-1,4-diium tetrachloridozincate hemihydrate, 2-(4-Methyl-1-piperazinylmethyl)acrylophenone(MPMAP), an antimicrotubular drug..Synthetic Route of C5H14Cl2N2

Tabushi, Iwao; Shimokawa, Kazuhiro published an article in Journal of the American Chemical Society. The title of the article was 《Model approach to retinal pigments. Remarkable red shift due to proximal ammonium ion》.Synthetic Route of C5H14Cl2N2 The author mentioned the following in the article:

Retinal derivs, I and II, were prepared and the absorption characteristics of a series of retinal derivatives (I, II, III, IV, and V) were investigated as a model study for the remarkable red shift observed for the native retinal pigments such as rhodopsins or bacteriorhodopsins. Remarkable red shifts observed in the following 2 derivatives were interpreted mechanistically; in retinal N’-methylpiperidinium perchlorate, 526 nm in CHCl3, as the electrostatic destabilization of the ground state by the proximal NH4 with a loose counter-anion in a less polar solvent; and in III chloride, 497 nm in water, as the balance between the electrostatic destabilization and the twist of the chromophore. In addition to this study using 1-Methylpiperazine dihydrochloride, there are many other studies that have used 1-Methylpiperazine dihydrochloride(cas: 34352-59-5Synthetic Route of C5H14Cl2N2) was used in this study.

1-Methylpiperazine dihydrochloride(cas: 34352-59-5) is used in the preparation of 2-(4-Methyl-1-piperazinylmethyl)acrylophenone(MPMAP), 1-methylpiperazine-1,4-diium tetrachloridozincate hemihydrate, 2-(4-Methyl-1-piperazinylmethyl)acrylophenone(MPMAP), an antimicrotubular drug..Synthetic Route of C5H14Cl2N2

Referemce:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics