Advanced Practical Organic Chemistry by Dorothy Bartlett

By Dorothy Bartlett

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A) Dimethylamine; (b) trimethylamine; (c) triethylamine. Thiols and Thioethers For naming thiols we add the suffix-thoil to the name of the parent alkane [Following fig(a). Thioethers are named like ethers using the prefix alkylthio, for example, 1 -(methylthio) propane. (b)]. CH2CH3 — SH H3C — S — CH3 H3C — S — CH2CH2CH3 (a) (b) (c) Fig. (a) Ethanethiol; (b) dimethylsulphide; (c) 1–(methylthiopropane). Advanced Practical Organic Chemistry 34 Taxonomy: P rimar y, Secondar y, T ertiar y and Primar rimary Secondary Tertiar ertiary Quaternar y Quaternary Definition The primary (1°), secondary (2°), tertiary (3°) and quaternary (4°) nomenclature is used in a number of situations: to define a carbon centre, or to define functional groups like alcohols, halides, amines and amides.

The main chain must include the functional group and the numbering is such that the functional group is at the lowest number possible. , 2,2-dimethyl-3-pentanone and not 4,4-dimethyl-3-pentanone): Fig. (a) 3-Methyl-2-butanone; (b) 2,2-dimelhyl-3-pentanone; (c) 4-ethyl-3-methyl-2-hexanone; (d) 3-methylcyclohexanone. 3-Methyl-2-butanone can in fact be simplified to 3-methylbutanone because there is only one possible place for the ketone functional group in this molecule. In case the c a r b o n y l C = O group is at the end of the chain; it would be an aldehyde and not a ketone.

Advanced Practical Organic Chemistry 43 3 Organic Synthesis Reagents Mechanism Reaction Here are given two Reactions : In terms of the catalysts used, The two reactions classified. Shown the steps in the mechanism of reaction : Product in both the reactions is CH3CH2CH3. Both reactions are catalytic hydrogenations (addition of H2). (i) is heterogeneous catalytic hydrogenation and (ii) is homogeneous catalytic hydrogenation. In step-1 an H2 adds to the rhodium complex and one Ph3P ligand (L) is lost, resulting in a five coordinate rhodium complex, A (L = Ph3P).

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