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Condensation products from propenal and pentaerythritol were first described in 1950. [4] [5] The synthesis is carried using a general synthesis method for acetals at acid pH (pH 3-5) by reacting an alcohol with an excess of aldehyde, which is stabilized with hydroquinone in the case of propenal, which tends to polymerize at elevated temperature.
Used in a more general sense, the term X,Y-acetal also refers to any functional group that consists of a carbon bearing two heteroatoms X and Y. For example, N,O-acetal refers to compounds of type R 1 R 2 C(OR)(NR' 2) (R,R' ≠ H) also known as a hemiaminal ether or Aminal, a.k.a. aminoacetal.
In the other hours, sections of these and other canticles are included in fixed material, consisting of amalgams of verse material from the Old Testament: Ninth Hour: a citation of Daniel 3:35; Peace Hour (after Vespers): Isaiah 8:9–10, Isaiah 9:26; Rest Hour (after the Peace Hour): Daniel 3:29-34, Luke 2:29-32, Luke 1:16-55.
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The example below depicts the acetalisation reaction of D-ribose 1. With acetone or 2,2-dimethoxypropane as the acetalisation reagent the reaction is under thermodynamic reaction control and results in the pentose 2. The latter reagent in itself is an acetal and therefore the reaction is actually a cross-acetalisation.
In organic chemistry, a hemiacetal is a functional group the general formula R 1 R 2 C(OH)OR, where R 1, R 2 is a hydrogen atom or an organic substituent. They generally result from the nucleophilic addition of an alcohol (a compound with at least one hydroxy group ) to an aldehyde ( R−CH=O ) or a ketone ( R 2 C=O ) under acidic conditions.
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For example, the words qol qore bamidbar panu derekh YHWH (Isaiah 40:3) is translated in the Authorised Version as "The voice of him that crieth in the wilderness, Prepare ye the way of the LORD". As the word qore takes the high-level disjunctive zakef katon this meaning is discouraged by the cantillation marks.
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