1.2- Diphenyl-6-hydroxy

Die thermische Ringoffnung von Sydnon-iminen fiihrt neben anderen Produkten zur Ausgangs-verbindung82. Von Interesse ist die photochemische Umsetzung von 3,4-Diphenyl-sydnon-acyl-iminen. Man isoliert 1,5-Diphenyl-4-hydroxy-l, 2,3-triazol (10-35%) und 3-Acyl-1,5-diphe-nyl-4-oxo-l,2,3-triazole (2 11 %)83 ... 

CBS-catalyst1 01 B-methyl oxazaborolidine (prepared from (R)-2-(diphenyl-hydroxy-methyl)pyrrolidine and methyl boronic acid)[31], 1.85 g, 6.7mmol... 

Telluran(IV) Diphenyl-hydroxy-perchloryloxy- El 2b, 625 (Ar2TeO -1- HC104)... 

Phosphanoxid Diphenyl-hydroxy-methyl- E2, 12 (Ar2P-Cl + CH20) Phosphinsanre... 

This J] state is a diradical and can abstract a methine proton from the solvent, then a hydroxyl proton to give acetone and diphenyl hydroxy radical, which then dimerizes to give the product. 

Diphenyl-l-ethylol Diphenylethanol or Diphenyl-hydroxy ethane, C6Hb.CH(OH).CH2.C8Hb mw 198.25. Exists as inactive form erysts (from eth + petr eth, dil ale or glae aeet ae), mp 62—68° its levorotatory form crysts from eth + petr eth), mp 67° and as dl-form ctysts, mp 66—69° (Ref). Other props methods of prepn are given in Beil... 

Methyl 2-(Diphenyl-hydroxy-methyl)-4-oxo-4-phenyl- 2134 Cyclopropane... 

Benzolsulfonyl-5-benzoyl-4-brom- 624 l-Benzolsulfonyl-4-brom- 582, 621, 627 1 - Benzolsulfonyl-4-brom-5-deuterio- 582 l-BcnzoIsulfonyl-4-brom-5-(diphenyl-hydroxy-rnethyl)- 624... 

A boryl enolate of an ester can be generated in situ by treatment of ethoxyacetylene with diphenyl-hydroxy borane in the presence of mercury(II) acetate, as shown in Scheme 6. ... 

As in the examples described earlier, the alkenylations are usually performed in acidic solvents such as acetic and propionic acids, which limits coexisting functional groups in substrates. In contrast, the authors developed a reaction system, Pd(OAc)2/Cu(OAc)2/LiOAc/dimethylformamide (DMF), which is applicable to the reaction of thiophenes and furans possessing acid-sensitive substituents [42]. For example, the diphenyl(hydroxy)methyl function in diphenyl(2-thienyl)methanol is tolerable under the weakly basic conditions, as shown in Scheme 18.41. The function can be subsequently substituted by Pd-catalyzed arylation with aryl bromides via C-C bond cleavage to produce the corresponding 2-alkenyl-5-arylthiophenes. 

The preparation of these [4-hydroxy-THISs, (1), X = O] by cydization of a-carboxy-N-arylthiobenzimides (5) by treatment with acetic anhydride and triethylamine has been investigated in detail, and the structure has been revised for the compound previously described as 2.3-diphenyl-4-hydroxythiazolium hydroxide inner salt (1, X = 0, R = R = Ph, R = H) (Scheme 5) (3, 10). 4-Hydroxy-THlSs also arise by condensation of gem-dicyanoepoxides with thioamides (Scheme 6) (8). 

---