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Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes cyanohydrin formation. The ions are generated from HCN under aqueous conditions. Once the cyanide ions are generated, the first step involves the nucleophilic attack of the cyanide ions on the electrophilic carbonyl carbon. This attack shifts the π electrons from the C=O to the oxygen atom forming the alkoxide ion intermediate. The alkoxide...
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Evidence for the cyclic CN2 carbene in solution.

Eva Hanzlová1, Rafael Navrátil, Jan Čejka

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The simplest N-heterocyclic carbene, diazirinylene (c-CN2), was observed as an intermediate. Its reactions with alcohols and amines yield cycloadducts and carboxamides, respectively.

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Area of Science:

  • Organic Chemistry
  • Carbene Chemistry

Background:

  • N-heterocyclic carbenes (NHCs) are versatile reactive intermediates.
  • Diazirinylidene (c-CN2) is the simplest known NHC, but its reactivity is not well-understood due to its elusive nature.

Purpose of the Study:

  • To investigate the intermediacy of diazirinylene (c-CN2) in chemical reactions.
  • To explore the reaction pathways and products of butyl 3-bromodiazirine-3-carboxylate (1a) with nucleophiles.

Main Methods:

  • Reactions of butyl 3-bromodiazirine-3-carboxylate (1a) with pent-4-en-1-ols and their sodium alkoxides in DMF.
  • Reactions of 1a with primary or secondary amines in methanol.

Main Results:

  • Evidence for diazirinylene (c-CN2) intermediacy was found through the formation of 2-oxabicyclo[4.1.0]heptanes and dipentenoxymethanes.
  • These products arise from intramolecular [2 + 1] cycloaddition and O-H insertion of pentenoxymethylenes, derived from c-CN2.
  • The reaction of 1a with amines yielded 3-bromodiazirine-3-carboxamides.

Conclusions:

  • Diazirinylene (c-CN2) is a viable intermediate in the fragmentation of butyl 3-bromodiazirine-3-carboxylate.
  • The electrophilic nature of c-CN2 dictates its reaction pathways with alkoxides.
  • The study provides insights into the synthesis of novel heterocyclic compounds.