'Ch 2 cl' diaporamas de présentation

From Biosphere to Molecule via

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Volume 1 of JACS : 1879 Volume 1 of Chem. Mater. : 1989

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EMPIRICAL FORMULA

EMPIRICAL FORMULA. The empirical formula represents the smallest ratio of atoms present in a compound. The molecular formula gives the total number of atoms of each element present in one molecule of a compound.

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Chapter 3 Stereochemistry-Enantiomerism

Chapter 3 Stereochemistry-Enantiomerism. C ???? ???? ????? ????. Constitutional isomer. ( ???? , ???????? ). ?? conformation. Stereoisomer. ????? (diastereomers) -- ???? (cis, trans). ( ???? , ????????? , ????????? ). ?? configuration. ???? ( ???? ) ( enantiomers).

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??? ???

??? ???. ???. ??????. 1 ?????????? ? 1 ????? ?????????????? ??? ( ?? ) ? ?? ( ??? ) ? ??? ( ?????? ? / AlCl 3 ? ??? ) ? ????????? /AlCl 3 ). ???????????. ??????. 1 ? ????????? ? 2 ???????????? ? 3 ? ???????????????????????????? 2 ??????? ? 1 ????? ??? ???. ??????. 2 ???????

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19.6 Substituents and Acid Strength

19.6 Substituents and Acid Strength. O. CH 2 COH. X. Substituent Effects on Acidity. standard of comparison is acetic acid ( X = H). p K a = 4.7. O. CH 2 COH. X. X. X. p K a. p K a. Alkyl groups have negligible effect. Electronegative groups increase acidity. H. H. 4.7. 4.7.

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