Organic Reactions Volume 4 - Sciencemadness Dot Org

6
The product gradually decomposes on standing at room temperature in the sealed tube.
7
Characterized as the semicarbazone.
8
Characterized as the oxime.
9
Characterized as the 2,4-dinitrophenylhydrazone.
10
The ester of this acid resists hydrolysis so that figure i probably is the structure for this adduct and not ii.
11
This aldehyde can be oxidized with silver oxide to the acid obtained from crotonic acid and 1,1,3-trimethylbutadiene (1(H).
52
The enol ether is readily hydrolyzed by dilute mineral acid.
13
The product was distilled in a stream of carbon dioxide.
14
Purified by formation of the sodium bisulfite addition product.
15
The addition product dissociates completely into its components when distilled at atmospheric pressure.
16
The acid was dehydrogenated to 4-methylisophthalic acid.
17
The adduct melts at body temperature.
18
The addition product of benzalacetophenone and bicyclohexenyl failed to give any ketone derivatives.
19
The bieyclohexenyl-/3-benzoylacrylic acid adduct will not add bromine.
20 17
These authors in their second paper show that the methyl group is probably located at Ci.
21
A mixture of the 2,3-dimethylbutadiene adducts from ds- and fraws-o-methoxycinnamie acid melts at 144-166°, Q
22
This acid could not be degraded to the corresponding amine by the Hofmann degradation of the amide. £H
23
Selenium dehydrogenation of this product is accompanied by decarboxylation, and 1-phenylphenanthrene results. 0
24
Unless the dienophilie ethene is flanked by two carbonyl groups no dehydrogenation is effected by nitrobenzene. j£j
25
Characterized as the phenylhydrazone.
26
Saponification of the ester gives the acid, m.p. 159-160°. 02
27
Dehydrogenation of this lactone to phthalide was not achieved. Kj
28
After refluxing in xylene the reaction mixture stood for twelve hours at 0°. ^H
29
These 1,4-diketones could not be converted to furan derivatives. H
30
Hydrogenation followed by saponification of this tetraethyl ester by ethanolic alkali gives cis-hexahydrophthalie acid, m.p. 190—191° (dec), while acid hydrolysis £3
leads to the trans isomer, m.p. 222°. ^
31
This bicyclo-(l,2,2)-heptene adds phenyl azide. t—i
32 0
Vinyl phenyl ketone was not used directly but was formed in the reaction mixture from the action of potassium acetate upon 0-chloropropiophenone. #-DialkyI- ^
aminopropiophenone hydrochlorides can also be used. *—1
33
The analytical figures differed from those calculated by 1%.
34
The melting point recorded is that of the acid.
35
Eight isomers are possible from this addition reaction, but no attempt was made to separate all the stereoisomers. 2-Benzoyl-4-methylbenzoic acid was obtained
by dehydrogenation.
36
Sixteen isomers are possible here, but again no attempt was made to isolate the isomers.
37
No addition occurred between cyclohexadiene, furan, 2-methylfuran, and 2,5-dimethylfuran and vinyl phenyl ketone, prepared from an ethanolic solution of
/3 chloropropiophenone and potassium acetate. In every case /5-ethoxypropiophenone was isolated and characterized as its 2,4-dinitrophenylhydrazone.
38
The reaction is exothermic.
39
This adduct decomposes (reverse Diels-Alder) on distillation.
40
The acid melts at 95-96°.
41
A trace of acrylic acid in the acrolein causes immediate polymerization of the diene.
42
An isomeric adduct is formed on prolonged heating.
43
The endo-c&ibonyl group is lost under these experimental conditions.