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Definition of Hemiacetal
1. Noun. An organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones.
Definition of Hemiacetal
1. Noun. (chemistry) Any of a class of compounds of general formula R2C(OH)OR' (where R' is not H). ¹
¹ Source: wiktionary.com
Definition of Hemiacetal
1. [n -S]
Medical Definition of Hemiacetal
1. RCH(OH)OR', a product of the addition of an alcohol to an aldehyde (an acetal is formed by the addition of an alcohol to a hemiacetal). In the aldose sugars, the hemiacetal formation is internal and labile, brought about by the 4-OH or 5-OH attack on the carbonyl O, yielding the furanose or pyranose structures; the hemiacetal forms of the sugars are involved in all polysaccharides, as glycosyls or glycosides. See: hemiketal, acetal. (05 Mar 2000)
Lexicographical Neighbors of Hemiacetal
Literary usage of Hemiacetal
Below you will find example usage of this term as found in modern and/or classical literature:
1. Journal of the American Chemical Society by American Chemical Society (1915)
"Both of these observations can be explained by the formation of a di- hemiacetal,
but more experiments are necessary before this explanation is accepted. ..."
2. Technology Quarterly and Proceedings of the Society of Arts by Massachusetts Institute of Technology, Society of Arts (1896)
"... in order to determine the conditions necessary for making substances of this
class. These experiments, together with a new hemiacetal from ..."
3. Technology Quarterly and Proceedings of the Society of Arts by Massachusetts Institute of Technology, Society of Arts (1895)
"The instability of the compounds and their salts is further evidence. By the
action of ethyl iodide on the silver salt of the hemiacetal a tetraethyl- ..."
4. Technology Quarterly by Massachusetts Institute of Technology (1896)
"... in order to determine the conditions necessary for making substances of this
class. These experiments, together with a new hemiacetal from ..."
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