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Com. It offers an extensive database, which can be accessed easily. One can search by inventors, assignees, titles, keywords, patent classes, etc. It is updated every Tuesday. Unfortunately, only patents issued after 1975 can be searched electronically and searching for chemical structures is complicated by the fact that trivial names abound. In compiling a database for HABIs, I found different patents which identified lophine dimers, imidazole dimers, imidazolyl dimers, DYLUX® , bisimidazoles, biimidazoles, etc.

Nitrogen-Containing Heterocyclic Free Radicals. XI. Synthesis of Diaryl Naphthyl Imidazoles. A. (Mord. Gos. , Saransk, USSR). Zh. Org. Khim. ). PhCH2 COC10 H7-a and -b were oxidized to the diketone (I) by SeO2 , I condensed with 10 RC6 H4 CHO to form the corresponding 4(5)-phenyl-5(4)-naphthyl2-arylimidazole (II) in 55–81% yield. PbO2 oxidn. of II in benzene yielded the corresponding free radicals, which had absorption max. at 610–45 nm; the EPR spectra were independent of R·. Nitrogen-Containing Heterocyclic Free Radicals.

Cooled, and added dropwise to 800 cc. concd. NH3 yielded 22 g. yellow IV, m. 245◦ (dioxane). ) of I (X = Ph) in 40 cc. dry Et2 O treated with 24 mg. dry Br in a stream of N and filtered, and the deep green free radical soln. concd. 12 g. yellow-green III (R = p-PhC6 H4 ), m. ). ) in 30 cc. 15 g. Br, a deep blue free radical soln. 20 g. yellow III, (R = p-ClC6 H4 ), m. ). ) in 50 cc. 5 hr. 12 g. PbO2 , filtered, and evapd. 17 g. olive-green III (R = p-Me2 NC6 H4 ), m. ). ) in 100 cc. 70% EtOH treated with 2 g.

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