The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 14187-32-7 is helpful to your research., Synthetic Route of 14187-32-7
Synthetic Route of 14187-32-7, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 14187-32-7, Name is Dibenzo-18-crown-6, molecular formula is C20H24O6. In a Article，once mentioned of 14187-32-7
The reaction systems ScCl3-SbCl5-MeCN-crown ether(L), where L = 6,7,9,10,17,18,20,21-octahydrodibenzo<1,4,7,10,13,16>hexaoxacyclooctadecine (dibenzo-18-crown-6), 6,7,9,10,12,13,20,21,23,24,26,27-dodecahydrodibenzo<1,4,7,10,13,16,19,22>octaoxacyclotetracosine (dibenzo-24-crown-8) and 6,7,9,10,12,13,15,16,23,24,26,27,29,30,32,33-hexadecahydrodibenzo<1,4,7,10,13,16,19,22,25,28>decaoxacyclotriacontine) (dibenzo-30-crown-10), have been investigated.Halide abstraction generates the ScCl2(1+) cation in situ which can be stabilised by macrocyclic complexation with the appropriate cyclic ether.The compound was isolated as a white solid and characterised as the hexachloroantimonate(V) salt from microanalytical and spectroscopic (IR, 1H and 13C NMR) data.Entrapment of a trans-ScCl2 unit within the ring cavity involving five-co-ordination of the ring oxygen atoms is seen as the most likely arrangement.Removal of a further chloride ion from this compound, effected by the addition of SbCl5 (three equivalents), provides 2 as established by microanalytical and spectroscopic data, and similar cavity entrapment of a trans-ScCl(MeCN) unit has been discussed.Solution studies, as monitored by 1H NMR spectroscopy, indicate that complete removal of chloride ion from 2 can be effected but only with a heavy excess (10 equivalents) of SbCl5.The compound *2MeCN 1 was isolated as red crystals and structurally characterised by X-ray diffraction studies.Crystals are monoclinic, space group P21/n, Z = 4 and R 0.0638.The structure consists of (1+) cations and (1-) anions with two solvent (MeCN) molecules trapped in the lattice.For the cation the Sc(III) co-ordination geometry is essentially pentagonal bipyramidal involving two axial chlorine atoms and five equatorial oxygen atoms comprising four from the crown ether with Sc-O distances in the range 2.184(7)-2.297(7) (mean 2.25 Angstroem) and one from a co-ordinated water molecule .The threaded ScCl2(1+) unit is located within the ring cavity but in an ‘off-centre’ position.Intracavity hydrogen bonding of the type Sc-OH2…Oring is present with Owater…Oring 2.65 and 2.75 Angstroem.The compound *MeCN*H2O 2 was isolated as yellow needle crystals and characterised crystallographically as the hexachloroantimonate(V) salt.Crystals are triclinic, space group P<*>, Z = 2 and R = 0.0639.There are two solvent molecules (MeCN and H2O) trapped in the lattice.In the (1+) cations the Sc(III) ion is seven-co-ordinate, involving bonds to three oxygens from the crown ether, two chlorine atoms and two water molecules, and …
The proportionality constant is the rate constant for the particular unimolecular reaction. the reaction rate is directly proportional to the concentration of the reactant. I hope my blog about 14187-32-7 is helpful to your research., Synthetic Route of 14187-32-7
Reference：
Chiral Catalysts,
Chiral catalysts – SlideShare