The degree of unsaturation, or index of hydrogen deficiency, is the number of pi bonds plus rings in a molecule. Specify the degree of unsaturation (index of hydrogen deficiency) of the following formulas: (a) C22H34 (b) C3H1002 (c) C3H4B13N 6
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- A compound C4H11N is known from its reactivity andspectroscopic properties to have no hydrogen atomsattached directly to the nitrogen atom. Write all structuralformulas consistent with this informationAn optically active unknown compound B, whose molecular formula is C6H10, reacts with H2/Ni produce compound C, whose molecular formula is C6H14. Compound C is optically inactive. What are the structures of compound B and C ?Arrange the following compounds in the increasing order of reactivity towards Conc.HNO3 & Conc.H₂SO4 1. Benzene 2. Chlorobenzene 3. phenol 4. Toluene 5. Nitrobenzene A 1.2.3.4.5 (B) 5.1,243 5.1.4.2.3 D 5.2.1.4.3
- Calculate the number of degrees of unsaturation in a compound ofmolecular formula C4H6, and propose possible structures ?Compounds A and B are isomers having molecular formula C5H12. Heating A with Cl2 gives a single product of monohalogenation, whereas heating B under the same conditions forms three constitutional isomers. What are thestructures of A and B?What is the degree of unsaturation for compoundC11H7ClO?
- Compound A (C6H12O2) reacts with water, acid, and heatto yield compound B (C5H10O2) and compound C (CH4O).Compound B is acidic. Deduce possible structures of compounds A, B, and CTo be aromatic, a molecule must have 4n + 2 πs electrons and must have a planar, monocyclic system of conjugation. Cyclodecapentaene fulfills one of these criteria but not the other and has resisted all attempts at synthesis. Explain.Plants extract are widely used in many parts of Cameroon to treat infectious disease or related symptoms including abdominal pains, itching, urinary and respiratory ailments, fever, coughing and diarrhea. Harunmadagascarin C as depicted below is an extract from the plant Harungana madagascariensis that has been studied for potential antimicrobial activity. Which statement best describes the stereochemistry of the compound? a. Harunmadagascarin C is achiral and does not have any stereogenic or chiral centers. b. The two stereogenic centers are currently in the E configuration, and the double bond in the ring structure is not stereogenic. c. There are four possible stereoisomers for Harunmadagascarin C since, as depicted, there are 2 stereocenters in the compound. d. There is one chiral center present in the molecule.
- Compound A has a molecular formula C6H12 , and has the following; 2 secondary carbons 2 primary carbons A plane of symmetry Compound A is treated with H2 and Pd to give compound B. Compound A was treated with ozone and gave 2 equivalents of compound C with the formula C3H6O.Compound A was then treated with CH2I2 and Zn to form Compound D, which has two stereocenters and is meso. What are the structures for compounds A-D? Compound A and Compound C IR spectrum are given below. What is the structure of Compound A?A difficult problem in the synthesis of PGF2α is the introduction of the OH group at C15 in the desired configuration. a. Label this stereogenic center as R or S. b. A well known synthesis of PGF2α involves reaction of A with Zn(BH4)2, a metal hydride reagent similar in reactivity to NaBH4, to form two isomeric products, B and C. Draw their structures and indicate their stereochemical relationship. c. Suggest a reagent to convert A to the single stereoisomer X.The shrub ma huang (Section 5.4A) contains two biologically activestereoisomers—ephedrine and pseudoephedrine—with two stereogeniccenters as shown in the given structure. Ephedrine is one component ofa once-popular combination drug used by body builders to increaseenergy and alertness, whereas pseudoephedrine is a nasaldecongestant.a.) Draw the structure of naturally occurring (−)-ephedrine, which has the1R,2S configuration.b.) Draw the structure of naturally occurring (+)-pseudoephedrine, whichhas the 1S,2S configuration.c.) How are ephedrine and pseudoephedrine related?d.) Draw all other stereoisomers of (−)-ephedrine and (+) pseudoephedrine, and give the R,S designation for all stereogeniccenters.e.) How is each compound drawn in part (d) related to (−)-ephedrine?