Piperonyl Aldehyde

FEMA No. 2911 3,4-(Methylenedioxy)-benzaldehyde Hehotropine Piperonyl Aldehyde... 

SYNS 3,4-BENZODIOXOLE 5-CARBOXALDEHYDE 3,4-DIHYDROXYBENZALDEHYDE METHYLENE KETAL DIOX i METHYLENE-PROTOCATECHUIC ALDEHYDE FEMANo. 2911 HELIOTROPIN 3,4-METH iTENE-DIHYDROXYBENZALDEHYDE 3,4-METHYLENEDIOXYBENZALDEHYDE PIPERON-ALDEHYDE PIPERONYL ALDEHYDE PROTO-CATECHUIC ALDEHYDE METHYLENE ETHER... 

METHYLENEDIOXYBENZALDEHYDE PIPERONALDEHYDE PIPERONYL ALDEHYDE PROTOCATECHUIC ALDEHYDE METHYLENE ETHER... 

Heliotropin 3,4-Methylene dihydroxybenzaldehyde 3,4-Methylenedioxybenzaldehyde 3,4-Methyleneprotocatechuic aldehyde Piperonal Piperonaldehyde Piperonyl aldehyde Protocatechuic aldehyde methylene ether Classification Diazo dye organic compd. 

The substituted benzyl alcohols listed below are prepared in a similar manner from the corresponding aldehydes in the yield indicated vanillyl alcohol, m.p. 113-114°, recrystallized from benzene, 95% anisyl alcohol, b.p. 127-130°/8 mm., 92% piperonyl alcohol, m.p. 52-53°, recrystallized from a mixture of ether and petroleum ether, 91% p-chlorobenzyl alcohol, m.p. 71-72.5°, recrystallized from ben-zene-ligroin mixture, 92% o-chlorobenzyl alcohol, m.p. 64 -65°, 96% p-bromobenzyl alcohol, m.p. 76-76.5°, 96%. 

Protocatechualdehyde (3,4-dihydroxybenzfildehyde). The preparation of this aldehyde from piperonal was accomplished for the first time in 1871 at Tiibingen by Rudolf Fittig, age 36, and his American co-worker Ira Remsen, age 25. In earlier work on the alkaloid piperine and its cleavage products piperic acid and piperidine, Fittig had isolated two products of oxidation of piperic acid, piperonal and piperonylic acid, now known to be constituted as formulated. The aldehyde bore... 

The principal route of PBO degradation proceeds via an Initial oxidation and hydrolysis at the position of the ethoxy ethoxybutoxy side chain leading to the formation of MDB alcohol, also referred to as piperonyl alcohol. This undergoes further oxidation, through MDB aldehyde, to MDB acid. This acid, also referred to as pipcnunylic acid (Kamienski and Casida, 1970). was detected as a metabolite in the urine of mice, either as the free acid or conjugated. It has also been confirmed as a metabolite in the rat (Lin and Selim, 1991 Selim, 1991), where it accounted for c. 3% of the applied dose in both urine and faeces. 

From this, piperic acid was considered to be represented by II (29) a structure accommodated by the subsequent observation that the acid is converted by careful oxidation (KMn04 in basic solution) to piperonal, piperonylic acid, and tartaric acid (32). The acid of structure II, obtained by condensing piperonal with acetaldehyde followed by the action of sodium acetate and acetic anhydride on the resulting aldehyde I, was identical with piperic acid (38). 

The first step in this sequence of reactions is the oxidation of piperonyl alcohol to obtain piperonal, an aromatic aldehyde. The reaction is selective and only the aldehyde is obtained no oxidation to the carboxylic acid is observed ... 

Phenolphthalein, 32 Phenothiazine, 67 Phenylacetic acid, 49, 51, 53 Phenylbutyl methyl ketone, 53 Phenylethyl alcohol, 51 Phenylethyl methyl ketone, 53 Phloretin, 43 Phloridzin, 27, 30, 43 Phloroglucinol, 42 Phosphoglycerate, 31 Physical constants, 6 Pinacol, 38 Pinene, 75 Piperonal, 53 Piperonylic acid, 51 Porphyrin, 63 Pregnanediol, 83, 84 Progesterone, 84 Propiophenone, 54 p-hydroxy-, 55 n-Propyl alcohol, 37 Propylene glycol, 38 Protocatechuic acid, 50 Protocatechuic aldehyde, 52 Z-Pulegol, 72 d-Pulegone, 72 Pyramidone, 63, 67 Pyridine, 63 Pyruvic acid, 11, 31 o-hydroxyphenyl-, 66... 

The present studies exhibited the prospects of the method of deposition-precipitation with ammonia for the gold catalyst preparation using [Au(NH3)4] synthesiz from HAuCk solution. As compared with the previously published DP ns procedures, the proposed procedure makes possible almost complete deposition (>99%) of gold from HAuCk solution on the Si02 and Ti02 supports at the low ratio NH3 Au = 6.5-7 and pH<6. The highly dispersed gold particles are catalytically active in the liquid phase oxidation of piperonyl alcohol to aldehyde and in the S-VOC removal. 

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