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204975-79-1

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204975-79-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 204975-79-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,9,7 and 5 respectively; the second part has 2 digits, 7 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 204975-79:
(8*2)+(7*0)+(6*4)+(5*9)+(4*7)+(3*5)+(2*7)+(1*9)=151
151 % 10 = 1
So 204975-79-1 is a valid CAS Registry Number.

204975-79-1Relevant articles and documents

Design of postmetallocene catalytic systems of arylimine type for olefin polymerization: XVI. Synthesis of (N-aryl)salicylaldimines containing pent-4-enyloxy group and their complexes with titanium(IV) dichloride

Oleinik,Oleinik,Zaitsev,Ivanchev

, p. 191 - 199 (2014/04/17)

Reactions of p-(pent-4-enyloxy)aniline with salicylaldehyde containing versatile substituents in the positions 3 and 5 in an open system without solvent at 130°C afforded a series of (N-aryl)salicylaldimines, which with TiCl2(OPr-i)2 formed complexes of titanium(IV) dichloride L2TiCl2.

Synthesis and configurational assignment of chiral salicylic aldehydes: Novel building blocks for asymmetric catalysis

Berkessel, Albrecht,Vennemann, Matthias R.,Lex, Johann

, p. 2800 - 2807 (2007/10/03)

We report the synthesis of three novel and chiral salicylic aldehyde building blocks 6-8, each in both enantiomerically pure forms. Two of these salicylic aldehydes were prepared from (+)-camphene and each bear a [2.2.1]bicycloheptyl substituent ortho to the salicylic hydroxy group. In the third case, the chiral element at the 6-position is a (1-phenylethyl) group. The synthetic sequences consisted of ortho-alkylation of para-cresol with either camphene or styrene and subsequent ortho-formylation of the product phenols, The chromatographic separation of enantiomers was accomplished through the diastereomeric imines obtained from condensation of the racemic salicylic aldehydes with (R)-phenylglycinol. Finally, the absolute configurations of two of the salicylic aldehydes were established by X-ray crystallography. For this purpose, the (1-phenylethyl)-substituted salicylic aldehyde was condensed with L-valinamide, and the relative configuration of the resulting Schiff base diastereomer 12 was determined. In the second case, the racemic intermediate phenol rac-15 was separated by HPLC on a chiral stationary phase, ortho-brominated, and analyzed by anomalous X-ray scattering. Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002.

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