Benzoin 2-hydroxy-2-phenylacetophenone

Benzoin (2-hydroxy-2-phenylacetophenone) [119-53-9] M 212.3, m 137 . Crystd from CCI4, hot EtOH (8mL/g), or 50% acetic acid. Crystd from high purity benzene, then twice from high purity MeOH, to remove fluorescent impurities [Elliott and Radley Anal Chem 33 1623 1961]. Sublimes. 

Benzoin (2-hydroxy-2-phenylacetophenone) condenses with guanidino compounds to form 2-substituted amino-4,5-diphenylimidazoles [383]. These imidazoles are suitable for chromatographic separation and determination by fluorescence measurement (excitation at 325 nm, emission at 425 nm). 

Benzoin, [119-53-9] 2-hydroxy-2-phenylacetophenone, CgH CH(OH)COCgH (mp, 133—137°C bp, 343—344°C at 101.3 kPa), is formed by the self-condensation of benzaldehyde in the presence of potassium cyanide. It is used on a small scale as a polymerization catalyst in polyester resin manufacture. 

Benzil. Benzil [134-81-6] (diphenylethanedione) is a yellow solid that crystallizes from alcohol in hexagonal prisms. Benzil can be prepared by the oxidation of benzoin [579-44-2] (2-hydroxy-2-phenylacetophenone) (298,299), which is itself prepared by the self-condensation of benzaldehyde (300). Benzil is commercially produced in Japan and is used as a uv resin curing sensitizer (301). It has also been suggested as a chigger repellant (302). 

Hydroxy-2-nitrobenzaldehyde, 2688 4-Hydroxy-3-nitrobenzenesulfonyl chloride, 2139 2-Hydroxy-6-nitro-1 -naphthalenediazonium-4-sulfonate, 3234 2-Hydroxy-2-phenylacetophenone, Benzoin, see 2-Hydroxy-1,2-diphenyletha-... 

Benzoin Oxime. 2-Hydroxy-l,2-diphenyiethanone Mime 2-hydroxy -2-phenylacetophenone oxime. C Hts-NOji mol wt 227.25. C 73.99%, H 5.76%, N 6.16%, O 14.08%. Two isomers occor a or anti and /S or syn. Both have been prepd from benzoin and hydroxyl amine hydrochloride. Prepn of a-form Werner, Detscheff, Ber. 38, 69 (1905) F. J. Welcher, Organic Analytical Reagents vol. Ill (Van Nosttand, New York, 1947) pp 239-251. Prepn of 3-form Werner, Detscheff, loc. cit, Configuration of a - and Worms Meisenheimer, Meis, Ber. 57, 289 (1924). 

Beilstein Handbook Reference) Aceto-phenone, 2-hydroxy-2-phenyl- AI3-00851 Benzoin )-Benzoin Benzoin extract (resinoid) Benzoylphenyl-carbinol Bitter-almond-oil camphor BRN 0391839 CCRIS 75 CCRIS 6696 EINECS 204-331-3 EINECS 209-441-5 Ethanone, 2-hydroxy-1,2-diphenyl- FEMA No, 2132 Fenyl-a-hydroxybenzylketon HSDB 384 2-Hydroxy-2-phenylacetophenone 2-Hydroxy-1,2-di-phenylethanone 1)-2-Hydroxy-1,2-diphenylethan-1-one a-Hydroxy-a-... 

Molybdenum(VI) dioxo complexes have also been used for the catalytic conversion of 1,2-diphenylhydrazine to azobenzene (795), and the oxidation of 2-hydroxy-2-phenylacetophenone (benzoin) to benzil (1025). In the latter, however, the reaction is rapidly deactivated as the catalyst [Mo02(S2CNEt2)2] is converted into the inactive molybdenum(V) dimer, [MoO(p-0)(S2CNEt2)]2-Attempts to oxidize aldehydes using these catalysts have generally been unsuccessful (795). 

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