When 1 g of compound X is dissolved in 100 mL of solvent, the observed rotation is +12. What will be the observed rotation if 1 g of compound X is dissolved in 200 mL of solvent?
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When 1 g of compound X is dissolved in 100 mL of solvent, the observed rotation is +12. What will be the observed rotation if 1 g of compound X is dissolved in 200 mL of solvent?
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- Two diastereomeric sets of enantiomers, A/B and C/D, exist for 3-bromo-2-butanol. When enantiomer A or B is treated with HBr, only racemic 2,3-dibromobutane is formed; no meso isomer is formed. When enantiomer C or D is treated with HBr, only meso 2,3-dibromobutane is formed; no racemic 2,3-dibromobutane is formed. Account for these observations.5) 1) MeO'Na* &r=&r MeOH 2) work-up (HCI, H₂O) 7) 8) NH OH 1) NaOH, H₂O 2) work-up (HCI, H₂O) HCI, H₂O heat 'H HO HO HCI, H₂O OH NH, CH How many stereoisomers are possible for this cyclic hemiacetal? OHExplain why C6H6 absorbs at 254nm in the UV and C6H5OH absorbs at 280 nm.
- An attempt at synthesizing a certain optically-active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of +16.0°. If it is known that the specific rotation of the R enantiomer is -33.3°, determine the percentage of each isomer in the mixture. R enantiomer: S enantiomer: % %A 1.52 M solution of (R)-2-butanol is mixed with an equal volume of a 0.760 M solution of racemic 2-butanol, and the resulting solution is analyzed in a sample container that is 1 dm long. What observed rotation is expected? The specific rotation of (R)-2-butanol is -13.9 degrees mL g-¹ dm¯¹. α = degAccount for the regioselectivity and stereoselectivity observed when 1-methylcyclopentene is treated with reagent. Q) BH3
- If a mixture has an ee of 90%, what is the percentage of each enantiomer? Multiple Choice 80% : 20% 55% : 45% 95% : 5% 65% : 35%Hexahelicene seems a poor candidate for optical activity because all its carbon atomsare sp2hybrids and presumably flat. Nevertheless, hexahelicene has been synthesized and separated into enantiomers. Its optical rotation is enormous: [a]D = 3700°.Explain why hexahelicene is optically active, and speculate as to why the rotation isso largeAssign R or S configurations to each stereogenic center of isoborneol and borneol. Give the relationship between these two stereoisomers.
- Draw the structure of an alkyl bromide with molecular formula CgH13Br that fits each description: (a) a 1° alkyl bromide with one stereogenic center; (b) a 2° alkyl bromide with two stereogenic centers; (c) an achiral 3° alkyl bromide.For the given ee values, calculate the percentage of each enantiomer present. Q: 90% eeThe pure D-form of a compound has a specific rotation (D line of sodium, 20° C) of +24°, whereas the pure L- form of the compound has a specific rotation (D line of sodium, 20° C) of -24°. If a scientist has a sample of this compound that is known to be 78% pure D-form (and, therefore, 100% - 78% pure L-form), what will be the observed rotation of this sample? Enter your answer to the nearest hundredth. The units are assumed to be degrees. 13.44