Liu, Wen-Shan published the artcileBridging Chiral de-tert-Butylcalix[4]arenes: Diastereomeric Crystallization-Based Optical Resolution and Determination of Absolute Configuration, Formula: C10H15ClO3S, the publication is ChemistrySelect (2018), 3(36), 10153-10156, database is CAplus.
A pair of diastereomers were synthesized from the conjugation of bridging chiral de-tert-butylcalix[4]arene racemate and (1S)-(+)-10-camphorsulfonyl chloride. The diastereomeric separation by crystallization was explored in different solvents, temperature and time. The optimal crystallization procedures afforded them in a desirable yield, de and purity. A pair of enantiomers of tert-butylcalix[4]arene were subsequently obtained after their hydrolysis. Moreover, their absolute configurations were determined by X-ray crystallog. anal. The crystallization results can match the large-scale preparation of optically pure de-tert-butylcalix[4]arene in laboratory and industry.
ChemistrySelect published new progress about 21286-54-4. 21286-54-4 belongs to chlorides-buliding-blocks, auxiliary class Chiral,Chloride,Sulfonyl chlorides,Aliphatic cyclic hydrocarbon,Ketone, name is ((1S,4R)-7,7-Dimethyl-2-oxobicyclo[2.2.1]heptan-1-yl)methanesulfonyl chloride, and the molecular formula is C10H15ClO3S, Formula: C10H15ClO3S.
Referemce:
https://en.wikipedia.org/wiki/Chloride,
Chlorides – an overview | ScienceDirect Topics