hemiacetal वाक्य
उदाहरण वाक्य
मोबाइल
- It undergoes rapid polymerization, including forming a hemiacetal cyclic dimer.
- These do not form as readily as hemiacetals and acetals.
- The conversion of a hemiacetal to an acetal is an S N 1 reaction.
- "' Cloxotestosterone acetate "'( chloro hemiacetal ether of testosterone.
- Hemiacetals and hemiketals are generally unstable compounds.
- Acetals are stable compared to hemiacetals but their formation is a reversible equilibrium as with esters.
- The aminal and the hemiaminal groups are analogous to hemiacetals and acetals with nitrogen replaced by oxygen.
- Glucose and many other aldoses exist as cyclic hemiacetals whereas fructose and similar ketoses exist as cyclic hemiketals.
- Aldehydes such as formaldehyde for example, are hydrated by water ( they form hemiacetals and acetals ).
- "' Cloxotestosterone "'( chloro hemiacetal ether of testosterone which was never marketed.
- The numbered carbons in the open-chain forms correspond to the same numbered carbons in the hemiacetal forms.
- Similarly, in excess alcohol, the aldehyde, its hemiacetal, and its acetal all exist in solution.
- In crystal form, three conformers occur as hemiacetal dimers with a 1, 4-dioxane ring skeleton:
- Hemiacetal results from addition of the alcohol's hydroxyl group to the carbon in the C = O bond.
- The cyclic hemiacetal forms of aldoses can open to reveal an aldehyde and certain ketoses can undergo tautomerization to become aldoses.
- D-ribose in itself is a hemiacetal and in equilibrium with the pyranose "'3 " '.
- The resulting molecule has an hemiacetal or hemiketal group, depending on whether the linear form was an aldose or a ketose.
- Though the cyclic forms of sugars are usually heavily favoured, hemiacetals in aqueous solution are in equilibrium with their open-chain forms.
- In this mechanism, the terminal olefin undergoes hydroxymercuration to produce the first intermediate, compound "'2 "', a hemiacetal.
- The formation of the hemiacetal causes carbon number 1, which is symmetric in the open-chain form, to become asymmetric in the cyclic version.
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