2- acetaldehyde diethylacetal

Acetal (acetaldehyde diethylacetal) [ 105-57-7] M 118.2, b 103.7-104 , d 0.831, n 1.38054, 1.3682. Dried over Na to remove alcohols and water, and to polymerise aldehydes, then fractionally distd. Or, treat with alkaline H2O2 soln at 40-45° to remove aldehydes, then the soln is saturated with NaCl, separated, dried with K2CO3 and distd from Na [Vogel J Chem Soc 616 1948]. 

Fig. 21. Hydrolysis of acetals at 20°C on a Dowex 50W X10 resin catalyst [513]. Rate coefficients of the resin-catalysed reaction (feres) versus rate coefficients of the reaction catalysed by dissolved inorganic acid (fehom)- 1 Formaldehyde dimethylacetal 2, formaldehyde diethylacetal 3, formaldehyde di-2-propylacetal 4, acetaldehyde ethyleneacetal 5, acetone ethyleneacetal 6, acetaldehyde dimethylacetal 7, acetaldehyde diethylacetal. The slope for acetals 1—3 is 1, for the acetals 3—7 0.5.

Formaldehyde dimethylacetal Acetaldehyde diethylacetal Acetone dimethylketal... 

As previously described, the 3//-pyrrolium adduct 50 is obtained from the TBSOTf-promoted aldol reaction between the 1-methylpyrrole complex 21 and acetaldehyde diethylacetal (Figure 11). Deprotonation of 50 occurs at C-3 with i-Pr2EtN to give the corresponding -substituted lH-pyrrole complex. Addition of triflic acid results in the elimination of ethanol to give the azafulvenium complex 141 as a 3 2 mixture of diastereomers (Figure 25). Deprotonation of 141 results in formation of the unstable unsubstituted P-vinylpyrrole complex 142, which can be trapped in situ with N-phenyl maleimide (vide infra). 

Ni-TMiBC (110) was obtained from pyrrole and acetaldehyde diethylacetal in an acetic acid solution of Ni(II) acetate under an inert atmosphere in a yield of about 1% based on Ni (84JA5164). 

The following compounds make up the aroma profile (the values quoted in parenthesis correspond to ppm values) linalool (45-80) a-terpineol (15-30) (Z)-3-hexenal (10-50) ethyl butyrate (10-30) acetaldehyd diethylacetal (10-... 

Hemiacetals, such as acetaldehyde, diethylacetal and citral dimethyl acetal... 

ACETALDEHYDE DIETHYLACETAL (105-57-7) Forms explosive mixture with air (flash point —5°F/—20°C cc). Reacts violently with oxidizers. Forms unstable and explosive peroxides on contact with heat and light. Flow or agitation of substance may generate electrostatic charges due to low conductivity. 

Hydrogen sulfide and aliphatic and aromatic thiols react readily with [ C]nitriles to give [ C]thioamides in yields of 45-70%. Upon treatment with a-halocarbonyl compounds they form [ C]thiazoles (Hantzsch thiazole synthesis). This was exploited for the synthesis of 2-(4-chlorophenyl)[2- C]thiazol-4-acetic acid f89. X = COOH) (Figure 7.23) and the 2-(2-phthalimidoethyl)-[2- C]tliiazole derivative 91 °. which were obtained when the corresponding thioamides M and 90 were treated with 1,3-dichloroacetone and bromo-acetaldehyde diethylacetal, respectively. As illustrated by the third example in Figure 7.23,... 

The 2-thiobenzoyl acetaldehyde diethyl acetal (17.2 g) was dissolved in 100 ml THF followed by the addition of 6 g NaOH in 20 ml H20. The mixture was refluxed under N2 for 15 h, then cooled and diluted with water (200 ml) and the product extracted with ether (3 x 200 ml). The extract was dried, the solvent removed in vacuo and the residue distilled to yield 7.1 g of mercaptoacetaldehyde diethylacetal. 

Catalytic activity of rare earth elements (i.e., lanthanides, symbol Ln) in homogeneous catalysis was mentioned as early as 1922 when CeCls was tested as a true catalyst for the preparation of diethylacetal from ethanol and acetaldehyde [1]. Solutions of inorganic Ln salts were subsequently reported to catalyze the hydrolysis of carbon and phosphorous acid esters [2], the decarboxylation of acids [3], and the formation of 4-substituted 2,6-dimethylpyrimidines from acetonitrile and secondary amines [4]. In the meantime, the efficiency of rare earth metals in heterogeneous catalysis, e. g., as promoters in lanthanide (element mixtures)-... 

The smaller TON (calculated for ethylbenzene oxidation) and the lower conversion in ethanol is due to the oxidation of the solvent itself, as already reported [18]. The main product of ethanol oxidation is diethylacetal formed by initial oxidation of the alcohol to acetaldehyde and further nucleophilic addition and substitution with other alcohol molecules. Some amount of acetic acid and acetaldehyde are also observed in the reaction mixture. However, the... 

Beilstein Handbook Reference) Acetaal Acetal Acetal diethylique Acetaldehyde diethyl acetal Acetaldehyde ethyl acetal Ace Acetol Aceton NS Acetron GP AI3-24135 AT-20GF BRN 1098310 Oiaethylacetal 1,1-Diaethoxy-aethan 1,1-Diathoxy-athan 1,1-Diethoxy-elhaan 1,1-Diethoxyethane Diethyl acetal Diethylacetal 1.1-Dletossietano EINECS 203-310-6 Ethane,... 

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