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463347-88-8

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463347-88-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 463347-88-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,6,3,3,4 and 7 respectively; the second part has 2 digits, 8 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 463347-88:
(8*4)+(7*6)+(6*3)+(5*3)+(4*4)+(3*7)+(2*8)+(1*8)=168
168 % 10 = 8
So 463347-88-8 is a valid CAS Registry Number.

463347-88-8Downstream Products

463347-88-8Relevant articles and documents

The first efficient synthesis and optical resolution of monosubstituted cyclotribenzylenes

Schmuck, Carsten,Wienand, Wolfgang

, p. 655 - 663 (2002)

A new and high yielding synthetic route to monosubstituted cyclotribenzylenes 6 via the cyclocondensation of benzene with a suitably monosubstituted diol 20, obtained from ozonolysis of the corresponding dibenzosuberene precursor 19, was developed for the first time! The dibenzosuberene itself could be readily prepared in large quantities from inexpensive starting materials in five steps. Using this synthetic approach, a mono bromosubstituted cyclotribenzylene 12a was synthesized on large scale. Another four monosubstituted cyclotribenzylenes 21-24 were also prepared either via bromine/lithium exchange followed by subsequent quenching with external electrophiles or a copper mediated reaction with cyanide. These molecules adopt a rigid crown conformation as shown by X-ray analysis and temperature dependent NMR studies. The barrier to inversion is quite high, requiring temperatures well above 120°C before inversion takes place. Futhermore, such monosubstituted cyclotribenzylenes are planar chiral and after optical resolution, using HPLC, we were able to obtain the first planar chiral Cl-symmetric cyclotribenzylenes in form of the optically pure enantiomers of 12a, the CD spectra of which are exact mirror images over the entire spectral range.

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