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71741-23-6

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71741-23-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 71741-23-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,7,4 and 1 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 71741-23:
(7*7)+(6*1)+(5*7)+(4*4)+(3*1)+(2*2)+(1*3)=116
116 % 10 = 6
So 71741-23-6 is a valid CAS Registry Number.

71741-23-6Downstream Products

71741-23-6Relevant articles and documents

Synthesis of Bikaverin

Katagiri, Nobuya,Nakano, Jun,Kato, Tetsuzo

, p. 2710 - 2716 (2007/10/02)

The total synthesis of bikaverin (1b) is described, from everninic acid (5) and 3,5-dihydrobenzoic acid (6).Dieckmann condensation of methyl 2-acetyl-3,5-bis(benzyloxy)phenylacetate (14), synthesised from (6), followed by treatment with protected everninic acid chloride (9) gave 1,3-bisbenzyloxy-6,8-bis(2-benzyloxy-4-methoxy-6-methylbenzyloxy)naphthalene (16).Photoinduced Fries rearrangement of (16) afforded 1,3-bis(benzyloxy)-7-(2-benzyloxy-4-methoxy-6-methylbenzoyl)-6-(2-benzyloxy-4-methoxy-6-methylbenzoyloxy)-8-hydroxynaphthalene (23).Ring closure of (23) with tetramethylammonium hydroxide in pyridine gave the angular benzoxanthene, 1,3-bis(benzyloxy-6-hydroxy)-10-methoxy-8-methylbenzoxanthen-7-one (25), which was oxidized with potassium dichromate to give the orthoquinone, 1,3-bis(benzyloxy)-10-methoxy-8-methylbenzoxanthen-5,6,7-trione (28).By a novel type of rearrangement, (28) was transformed into the linear benzoxanthen, 8,10-bis(benzyloxy)-3-methoxy-1-methylbenzoxanthen-6,11,12-trione (29) by treatment with silica gel.Oxidation and debenzylation of (29) with manganese dioxide in concentrated H2SO4 gave norbikaverin (1a).

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