Propanal Propionaldehyde

Figure 5.28 One-pot dual-enzyme cascade, starting from dihydroxyacetone and propionaldehyde (propanal), with in situ phosphorylation and dephosphorylation steps.

Cognate preparation. Propionaldehyde (propanal). Use 34 g (42.5 ml, 0.567 mol) of propan-l-ol and a solution containing 56g (0.188 mol) of sodium dichromate dihydrate, 300 ml of water and 40 ml of concentrated sulphuric acid. The experimental details are identical with those for butyraldehyde, except that the temperature at the top of the column is not allowed to rise above 70-75 °C, and during the subsequent heating for 15 minutes the liquid passing over below 80 °C is collected the receiver must be cooled in ice. The yield of propionaldehyde, b.p. 47-50 °C, is 12 g (36%). 

Propionaldehyde Propanal Tetrolic acid 2-Butynoic acid... 

SYNS METHIONAL P-(METHYLMERCAPTO)PROPIONALDEHYDE 3-(METHYLMERCAPTO)PROPIONALDEHYDE METHYLMERCAPTOPROPIONIC ALDEHYDE 3-(METHYLTHIO)PROPANAL P-(METHYLTHIO)-PROPIONALDEHYDE PROPANAL, 3-(METHYLTHIO)-(9CI) PROPIONALDEHYDE, 3-(METHYLTHIO)- THIA-4-PENTANAL (DOT)... 

Chemical Name propionaldehyde, propanal CAS Registry No 123-38-6 Molecular Formula CjHgO, CHjCHjCHO Molecular Weight 58.079 Melting Point (°C) ... 

C.3) (C.3) Propanal, propionaldehyde, propanal, propionic aldehyde, propylaldehyde, methylacetaldehyde [123-38-6] FEMA 2923... 

Brunnemann et al. (500) detemiined several volatile aldehydes and ketones in tobacco headspace and tobacco smoke by derivatization with 2,4-dinitrophenylhydrazine. Tobacco smoke carbonyl components identified included Formaldehyde, acetaldehyde (1000 pg/cig), propionaldehyde (propanal), acrolein (propenal), isobutyraldehyde (2-methylpropanal), crotonaldehyde (2-butenal), methacrolein (2-methylpropenal), benzaldehyde (1 pg/cig), and acetone. 

Also included in Table XXIII-5 are several components that do not appear in any of the Hoffmann co-authored lists but recently have been included with analyses of Hoffmann-listed components, for example, 1-naphthalenamine (1-amino-naphthalene a-naphthylamine), 3-aminobiphenyl ([l,T-bip-henyl]-3-amine), propionaldehyde (propanal), butyraldehyde (butanal), and acetone (2-propanone). Table XXIII-5 includes several tobacco smoke components that the lARC has reclassified with regard to their tumorigenicity, for example, chrysene and di(2-ethylhexyl) phthalate. Thus, chrysene no longer appears on the more recent Hoffmann lists (1740, 1741, 1743, 1744) and di(2-ethylhexyl) phthalate was omitted from (1743,1744). 

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