ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Two types of 2,6-dimethyl-benzo[1,2,4,5]bis-imidazole-4,8-quinones (X, R = H and R = C6H5) are known. The method of EFROS6) (X, R = H) is unsuitable for the synthesis of N-substituted benzo-bis-imidazole-quinones, whilst the ring closure of FRIES and REIZ3) proceeds with low yield and works only with N-aryl compounds. A new convenient synthesis for hydroquinones of type IX and quinones of type X has been found: the tetraaminoquinones II are reduced to the hydroquinones VIII; subsequent cyclisation with acids leads to the new benzo-bis-imidazole hydroquinones IX, which on oxidation are converted to the quinones X.
Additional Material:
3 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19610440320
