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74563-17-0

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74563-17-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 74563-17-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,5,6 and 3 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 74563-17:
(7*7)+(6*4)+(5*5)+(4*6)+(3*3)+(2*1)+(1*7)=140
140 % 10 = 0
So 74563-17-0 is a valid CAS Registry Number.

74563-17-0Upstream product

74563-17-0Relevant articles and documents

Reductive Metalation of 1,3-Diphenylisobenzofuran. Stereoselective Formation of Cis Products

Smith, James G.,McCall, Robert B.

, p. 3982 - 3986 (1980)

1,3-Diphenylisobenzofuran was reduced in tetrahydrofuran by alkali metals to a dianion.This dianion on protonation, methylation, or carboxylation gave products which were predominantly cis.It is suggested that the dianion or the intermediate monoreacted monoanion adopts a preferred conformation in which steric interaction between the phenyl substituents is minimized and orbital overlap between the carbanion and the benzene ring is maximized.By use of this stereoselectivity of the dianion, a series of 1,3-polymethylene-bridged 1,3-diphenylphthalans was prepared.The possibility of single electron transfer during the alkylation of the dianion was examined by alkylating the dianion with tert-butyl halides.Complex reaction mixtures were formed but extensive alkylation occurred and mono- and dialkylation products were characterized.

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