Biphenyl 4,4’-diacetyl

Secantioquine (512), C37H3gN2Og, amorphous, [a]D —15° (c 1, CHC13), was obtained from Pseudoxandra aff. lucida (Annonaceae). The structure was deduced from the UV base shift, NMR, and formation of secantioquine 0,O-diacetate by oxidation (KMn04/Me2CO) of the 0,0-diacetyl derivative of antioquine (466). Secantioquine is the first biphenyl-linked seco bisbenzyltetrahydroisoquinoline alkaloid (551,568). 

SYNS N,N -(1,1 -BIPHENYL)-4,4 -DIYLBIS-ACETAMIDE 4, 4 -BIACETANIUDE NdS -4,4 -BIPHENYLYLENE-BISACETAMIDE 4,4 -DIACETYLAMINOBIPHENYL N,N -DIACETYL BENZIDINE 4,4 -DIACETYLBENZ-IDINE... 

The breakdown of the benzene ring to aldehydes is extremely rare and has been achieved only by ozone. A historical and classical example is the disintegration of o-xylene to a mixture of glyoxal, methyl glyoxal, and diacetyl (butanedione) in the predicted ratios [104]. From the preparative point of view, the conversion of phenanthrene into 0,0 -diformyl-biphenyl (diphenaldehyde) [1123] or o-formylbiphenyl-o -carboxylic (diphenaldehydic) acid [1124] is more important (equation 154). 

A repeat of Billman s procedure using sodium hydride dispersions with acetanilide and dibromobutane gave a 20% better yield (98%) of N,N -diacetyl-N biphenyl-a,(o-diaminobutane in slightly less time. The acetylated compounds, unless the alkane is methane, are easily hydrolyzed to the amine. 

Asafetida (Ferula foetida) extract Benzoic acid Biphenyl Brominated vegetable oil Butyrophenone Caffeine Capric acid Caramel Carboxymethylcellulose Casein Chloroform Citric acid Coumarin Denatonium benzoate . Diacetyl... 

The synthesis of the lichen dibenzofuran pannaric acid (470) from pannarol (471) was reported by Elix 110) (Scheme 59). Pannarol has been synthesized via a mixed Ullmann reaction and subsequent hydrobromic acid induced cyclisation of the unsymmetrical biphenyl separated from the mixture of three products (2). Pannarol (471) was methylated and then acetylated to yield a mixture of 2,6-diacetyl-3,9-dimethoxy-l,7-dimethyl-dibenzofuran (472) and 4,6-diacetyl-3,9-dimethoxy-l,7-dimethyldibenzo-furan (473), which were separated by preparative t.l.c. The major product (472) was then oxidized and demethylated to yield pannaric acid (470). 

CO, CH4, CO2, ethylene, acetylene, ethane, H2O, propylene, ethanal, 192 acetone, propanal, ethanol, benzene, toluene, ethyl benzene, styrene, p-vinyl toluene, benzaldehyde, p-ethyl toluene, acetophenone, methyl benzoate, vinyl benzoate, ethyl benzoate, p-methyl acetophenone, benzoic acid, p-methyl vinyl benzoate, p-vinyl acetophenone, propyl benzoate, p-ethyl vinyl benzoate, p-vinyl vinyl benzoate, biphenyl, 1-hydroxy ethyl benzoate, diacetyl benzene, p-acetyl vinyl benzoate, divinyl terephthalate, ethyl vinyl terephthalate,... 

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