Dissolving Knorr's pyrrole in concentrated sulfuric acid, and then pouring the resulting solution into water will hydrolyze the 4-ester group selectively.
42.
They have four pyrrole rings, each ring consisting of C4H4NH . The main role of the tetrapyrroles is their connection in the biological oxidation process.
43.
Trost's route to the macrocyclic core of roseophilin, like others, relied on a Paal Knorr Pyrrole synthesis to obtain the fused pyrrole.
44.
Trost's route to the macrocyclic core of roseophilin, like others, relied on a Paal Knorr Pyrrole synthesis to obtain the fused pyrrole.
45.
Both nitrogens are each independently part of a moiety, such as pyrrole, imidazole, thiazole, pyridine, quinoline, indole, benzothiazole, etc.
46.
"' Phosphole "'is the organic compound with the chemical formula C 4 H 4 PH; it is the phosphorus analog of pyrrole.
47.
Heating the 1, 4-diketone with ammonium acetate in methanol with camphor sulfonic acid and 4 angstrom molecular sieves gave the pyrrole with no N-substitution.
48.
Aromatic nitrogen bonded to hydrogen, as found in pyrrole must be represented as [ nH ] and imidazole is written in SMILES notation as n1c [ nH ] cc1.
49.
The two-pyrrole molecule looks red, the three-pyrrole molecule looks blue and the four-pyrrole molecule looks green ( like chlorophyll, a tetrapyrrole ).
50.
The two-pyrrole molecule looks red, the three-pyrrole molecule looks blue and the four-pyrrole molecule looks green ( like chlorophyll, a tetrapyrrole ).
