Why is it not possible to find a five-fold symmetry operation in naturally-occurring crystals?
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- Why is it not possible to find a five-fold symmetry operation in naturally-occurring crystals?
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- When Alfred Werner was developing the field of coordination chemistry, it was argued by some that the optical activity he observed in the chiral complexes he had prepared was due to the presence of carbon atoms in themolecule. To disprove this argument, Werner synthesized a chiral complex of cobalt that had no carbon atoms in it, and he was able to resolve it into its enantiomers. Design a cobalt(III) complex that would be chiral if it could be synthesized and that contains no carbon atoms.Convert the following Fischer structures into cyclic Haworth structures:What is the structure labeled as 2?
- What structures are labeled 1 in the diagrams? What structure is labeled 2 in the diagrams? What is labeled 3 in both diagrams? What is labeled 4 in the diagrams? What is labeled 5 in the diagrams?Which of the following structures exhibit geometric isomerism? Draw and name the two in each case.Using the generic structure shown, indicate what the substituents are for the structure of finerenone (R1, R2, R3, for Ar indicate R6, R8, R9, R10, for D indicate R4). R1 R2 R3 = For Ar: R6 R8 = R9 = R10 = For D: R4= Finerenone: H₂N HC Generic formula: H₂N 230 R+ 'R'. R$ of
- Consider the structure of the tripeptide (in its fully protonated form) below. H H H + I || H₂N-C-C-N-C-C-N-C-C-OH 1 I | H CH₂ H CH₂ CH₂ T C=O OH AA1 0=0 || HC-CH3 CH3 AA2 AA3 0=C 1. Give the sequence of the tripeptide using the ONE-LETTER DESIGNATION (UPPERCASE LETTER) with NO spaces and symbols between each letter. 2. How many ionizable groups are there in the tripeptide? Give the numerical value (e.g., 10 not ten). • pH 10: {Choices: -2, -1, 0, +1, +2} 3. Which amino acid residue has one ionizable group left upon forming the tripeptide? {Choices: AA1, AA2, AA3, none, all} 4. Give the net charge of the dominant structure of the tripeptide at the given pH values. The pK, values of the amino acids are given in Table 1. • pH 4: {Choices: -2, -1, 0, +1, +2}At equilibrium, D-galactose exists almost exclusively in its α and β pyranose forms. Aqueous solutions are freshly prepared for the α and β forms, both at the same concentration and temperature. The solution of the α form rotatesplane-polarized light +150.7°, whereas the solution of the β form rotates the light +52.8°. Over time, both solutions have the same measured rotation of +80.2°. How much of the equilibrated solution does each form account for?H OH CH2OH D H ОН H الحزن ОН CH2OH ОН H ОН I Which of the following statements correctly describes this structure? (A) The monomer units are bonded by beta 1-2 glycosidic linkage. B The monomer units are bonded by alpha 1-2 glycosidic linkage. The monomer units are bonded by alpha 1-4 glycosidic linkage. The monomer units are bonded by beta 1-4 glycosidic linkage. H CH2OH H ОН H ОН H ОН
- Draw the two possible Haworth structures (both alpha and beta anomers) for the following monosaccharides and give their corresponding systematic names. [Show the stepwise process]GenAlex Medical, a little-known division of a major Swiss pharmaceutical firm, recently developed a new synthetic steroid S. Their patent application describes S as "made from a steroid nucleus with hydroxyl groups at positions 3 and 7, and methyl groups at positions 4 and 12." In the drawing space below, draw the chemical structure of S. If more than one structure is possible, you can draw any of them. Click and drag to start drawing a structure. ח' G c EVizamylTM is used in brain scans for Alzheimer’s disease. Draw the structure of VizamylTM and identify the radioisotope present in the structure. Explain how F-18 differs from F-19.