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Creators/Authors contains: "Sarkar, Aritra"

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  1. ; ; ; ; ; ; (, The Journal of Organic Chemistry)
    Full Text Available 
  2. ; ; ; ; (, Chemistry – A European Journal)
    Abstract The stereochemistry of the uncatalyzed chlorolactonization of 4‐phenylpent‐4‐enoic acid at room temperature was examined to probe the reaction's intrinsic diastereoselectivities as a function of chlorenium ion donor, solvent polarity, and reactant concentration ranges. Kinetic studies using Variable Time Normalization Analysis (VTNA) revealed differing reaction orders for thesynandantialkene addition processes. Aided and illustrated by quantum chemical modeling, this detailed mechanistic analysis of the substrate's intrinsic chlorolactonization reactions points to concerted AdE3‐type paths for bothsynandantiadditions. By illuminating the factors selecting forsyn‐vsanti‐addition paths, the results provide key reference points for future studies of stereocontrol in halofunctionalization reactions. 
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  3. ; ; ; ; ; (, Chemical Science)
    null (Ed.)
    A simple chiroptical solution for the absolute stereochemical determination for asymmetric phosphorus V stereocenters is presented. Strong coordination of the phosphorus oxide with the Zn-metallo center of the racemic host Zn-MAPOL 2 leads to an induced axial chirality of the host, yielding a strong ECCD signal. A mnemonic is proposed to correlate the asymmetry of the guest molecule with the observed ECCD signal. 
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  4. ; ; ; ; (, Chirality)
    Abstract Rapid derivatization of chiral 1,2‐diols with dinaphthyl borinic acid (DBA) leads to a cyclic boronate, enabling the absolute stereochemical prediction via exciton‐coupled circular dichroic (ECCD) of the naphthyl groups. Aryl‐ and alkyl‐substituted 1,2‐diols derivatized withDBAyield a predictable ECCD, which is also in agreement with theoretical predictions derived from computationally minimized structures. 
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