Get Advanced organic chemistry, part B: Reactions and synthesis PDF

By Carey F.A., Sundberg R.J.

ISBN-10: 038768350X

ISBN-13: 9780387683508

The two-part, 5th version of complex natural Chemistry has been considerably revised and reorganized for higher readability. the fabric has been up to date to mirror advances within the box because the past version, specially in computational chemistry. half B describes the main normal and precious man made reactions, geared up at the foundation of response variety. it could possibly stand-alone; jointly, with half A: constitution and Mechanisms, the 2 volumes offer a complete beginning for the learn in natural chemistry. significant other web pages supply electronic types for college students and workout recommendations for teachers.

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Extra resources for Advanced organic chemistry, part B: Reactions and synthesis

Example text

In favorable cases such as 2-methyl-3-pentanone and ethyl propanoate, good selectivity is possible for both stereoisomers. In other cases, such as 2,2-dimethyl-3-pentanone, the inherent stability difference between the enolates favors a single enolate, regardless of conditions. O– O– >> CH3 C(CH3)3 C(CH3)3 CH3 Chelation affects the stereochemistry of enolate formation. 19 19 K. Hattori and H. Yamamoto, J. Org. , 58, 5301 (1993); K. Hattori and H. Yamamoto, Tetrahedron, 50, 3099 (1994). 2. LiBr LDA LDA 30:70 20:80 34:66 56:44 > 98 2 100:0 4:96 < 2 98 > 97 3 92:8 Esters CH3 CH2 CO2 CH2 CH3 f CH3 CO2 C CH3 3 g CH3 CH2 3 CO2 CH3 g PhCH2 CO2 CH3 h LDA LDA LDA LDA 6:94 5:95 9:91 19:81 88:15 77:23 84:16 91:9 Amides CH3 CH2 CON C2 H5 2 i CH3 CH2 CON CH2 4 i LDAi LDA > 97 3 > 97 3 CHAPTER 1 Alkylation of Enolates and Other Carbon Nucleophiles a.

Stirling, J. Chem. Soc. B, 67 (1968); For a discussion of factors that affect intramolecular alkylation of enolates, see J. Janjatovic and Z. Majerski, J. Org. , 45, 4892 (1980). of ketones and carboxylic acids. Both -keto acids and malonic acids undergo facile decarboxylation. 4. In these procedures, an ester group is removed by hydrolysis and decarboxylation after the alkylation step. The malonate and acetoacetate carbanions are the synthetic equivalents of the simpler carbanions that lack the additional ester substituent.

A. Smith, Org. , 56, 52 (1977). j. G. Stork, P. Rosen, N. Goldman, R. V. Coombs, and J. Tsujii, J. Am. Chem. , 87, 275 (1965). to the more-substituted enolate precedes alkylation. Entries 3 and 4 show regiospecific generation of enolates by reaction of silyl enol ethers with methyllithium. 64 Entries 5 and 6 illustrate this method. Entry 7 shows the kinetic deprotonation of 3-methylbutanone, followed by alkylation with a functionalized allylic iodide. Entries 8, 9, and 10 are examples of alkylation of enolates generated by reduction of enones.

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Advanced organic chemistry, part B: Reactions and synthesis by Carey F.A., Sundberg R.J.


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