Synthetic Methodology of Manganese Corroles: Recent Developments
Anil K*, Omprakash Y
Department of Applied Chemistry, Delhi Technological University, Bawana Road, Delhi 42, India
Let Un be the set of unicyclic molecular graphs with 3 ≤ n ≤ 8 vertices. We show that the cycle Cn has maximal
Laplacian-energy-like invariant (LEL) in Un. The authors partially proving that the conjecture hold for any unicyclic
molecular graph in Un, where 3 ≤ n ≤ 8 Moreover, we show that Cn has maximal energy (E) in Un for 3 ≤ n ≤ 7,
but for n=8 this is not true.
Molecular graphs, Laplacian energy-like invariant, Energy
Corrole is trianionic tetrapyrrolic macrocycle containing an eighteen pi-electron having a direct link between both
pyrrole–pyrrole units [1,2]. The structure of corrolazine, corrine and porphyrine is in close resemble to corrole.
Porphyrin has a larger cavity and higher symmetry than corrole due to direct pyrrole-pyrrole link. Therefore corrole
has C2v symmetry . The most interesting properties of the corroles is the trianionic nature due to this properties
corrrole stabiles metal ions in higher oxidation (+4 to +6) state [4-7]. These ultimate properties are responsible for the
huge utility of manganese and iron corroles for great important aspects compatible to medicine and energy , because
they initiate the molecules as like: O2 , H2O2 , HOONO ,CO2, , H+ and more. Metallocorroles
already reported as catalysts for many applications such as transfer of oxygen atom, CO2 and reduction of protons
[12-22]. Application of manganese corroles reported in catalysis [23-27], ion-selective electrodes , Langmuir–
blodgett films [29,30], single-chain magnets  and medicinal research [32,33]. Gross et al. reported the synthesis
of tris(pentaflurophenyle)corrole in good yield using solvent free metthod [28-30]. Furthermore, the synthesis of
corrole macrocycle reported by Kumar  and Paolesse et al.  by condensation of dipyrromethane (DPM) with
aromatic aldehyde, and by the Rothemund reaction respectively. This synthetic achievement has expedited the study
of macrocycle of the corrole a new branch of porphyrin chemistry. It has been clearly seen that in area of corrole
chemistry increased exponentially a huge publication till now [33-44]. This review is mainly accommodates all
synthetic aspect in manganese corrole chemistry from 1999 to 2018.
Results and Discussion
Recently, few general approaches for the synthesis of manganese corroles were reported. First, use of manganese
salt to cyclize tetrapyrrolic precursor and the second, is the reaction of manganese salt with free base corrole. The
third report recently reported by Yadav et al. by using manganese salt with bilane to yield metallocorroles through
difficult C-C bond formations. In the first methodology, cyclization of 1,19-dideoxybiladiene-ac in methanol and basic
condition using manganese(II) acetate tetrahydrate as template to yield octamethylcorrolato manganese(III)s in good
yield 50%-60% [45,46] has been reported (Figure 1).
Figure 1: Cyclization of 1,19-dideoxybiladiene-ac with manganese (II) acetate tetrahydrate
In second methodology, as shown in Figure 2, using two equivalent of Mn(II) acetate and molecular oxygen in boiling
DMF to cyclize tetrapyrrolic precursor of 2,2’/-Bisdipyrrin to give 18% yield of octaethylcorrolatomanganese(III). In
the series of facile synthetic protocol corroles, an another alternative most convenient method is reaction between free
base corrole and manganese(II) acetate tetrahydrate to obtain Mn(III) corrole [8-11] in 90%-98% yield in presence of polar solvent such as dimethylformaamide, methanol or pyridine [45-50]. Corroles have better solubility in polar
solvents in comparison to other porphyrinoid systems. Ionic corroles form metal complexes easily with manganese
by the same method [51-55]. And in the last not but least recently Yadav et al. reported compound 12 to 14, new C-C
coupling between both pyrroles in bilane using manganese(II) acetate tetrahydrate as template in the presence of
molecular oxygen in DMF to obtain 30%-35% yield of manganese (III) corrole as shown in Figure 3.
Figure 2: Cyclization of 2,2’–bisdipyrrin
Figure 3: New synthetic methodology to yield manganese (III) corrole
Demetallation of manganese corroles
The synthesis of highly electron-deficient and perhalogenated free base corrole can be achieved with the reductive
demetallation of manganese corroles but did not gain much attention. Bröring et al. firstly reported by using HBr in
HOAc (Figure 4) for demetallation of (OEC)Mn(III) 15 to yield H3(OEC) . Another method was reported by
Bröring et al.  by using acid mixture of 10:1 volume ratio of CHCl3/H2SO4. Demetallation of beta-octabromomeso-
triarylcorroles are possible by using concentrated H2SO4 with 5-200 equivalent of FeCl2 or SnCl2 H3(Br8tpfc),
in generally through reductive demetallation of (Br8tpfc)Mn(III). We can be obtained in 86% yield using concentrated
H2SO4 in the presence of FeCl2 . Without reductant demetallation also reported by Liu et al. in presence of HCl
with SnCl2 as well as in HOAc-H2SO4.
Figure 4: Demetallation of manganese corroles
This short review provides the all synthetic methodology and demetallation process of manganese(III)corrole from
1999 to 2018. Furthermore, the main purpose of this review to provide information about currently reported synthetic
methodology in manganese(III) corroles. The prestige of this protocol is the very simple reaction which is applicable
for all type of aromatic aldehyde and aryldipyrromethane. This method also avoids the difficult steps of earlier reported
by Broring et al. in compound 2 to 6. Mainly green chemistry protocol has been adopted in this methodology. The
yield of the synthesized metallocorroles was plausible high and also need very short time period than earlier reported
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