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81730-48-5

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81730-48-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81730-48-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,7,3 and 0 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 81730-48:
(7*8)+(6*1)+(5*7)+(4*3)+(3*0)+(2*4)+(1*8)=125
125 % 10 = 5
So 81730-48-5 is a valid CAS Registry Number.

81730-48-5Downstream Products

81730-48-5Relevant articles and documents

Influence of the methyl group at C=C bridging bond of stilbene on the longest wavelength maximum in ultraviolet absorption spectra

Zhang, Yanxiu,Cao, Chao-Tun,Zhang, Jingyuan,Cao, Chenzhong

supporting information, (2017/09/30)

The compounds stilbenes XArCH=CHArY(XSBY) and 1,2-diphenylpropylenes XArC(Me)=CHArY(XSMBY) have bridging groups CH=CH and C(CH3)=CH, respectively, in which the C(CH3)=CH has a side-group CH3 at the carbon-carbon double bond. A series of XSMBY were synthesized, and their longest wavelength maximum λmax (nm) in ultraviolet absorption spectra were measured in this work. We investigated the change regularity of the νmax (cm-1, νmax?=?1/λmax) of XSMBY and compared it with that of XSBY. The results indicate that (1) there is no good linear relationship between the νmax of XSMBY and that of XSBY. (2) Because of the influence of the side-group CH3, in case of the same couple of groups X and Y, the λmax of XSMBY is shorter than that of XSBY, that is, it has a blue shift. (3) The cross-interaction between the side-group CH3 and Y has an important effect on the νmax of XSMBY, while the cross-interaction between the side-group CH3 and X has a little effect on the νmax and can be ignored. (4) The specific cross-interaction between X and Y has important effect on the νmax of XSMBY, whereas it has no important effect on the νmax of XSBY.

MECHANISM OF INTRAMOLECULAR CYCLIZATION IN ARYL 2-CYCLOPROPYLPHENYL SULFONES UNDER CONDITIONS OF ACID ISOMERATION

Pisanova, E. V.,Saginova, L. G.,Shabarov, Yu. S.

, p. 278 - 281 (2007/10/02)

Treatment of phenyl and p-tolyl 2-cyclopropylphenyl sulfones with concentrated sulfuric acid at 20 deg C leads to intramolecular cyclization with the formation of 10-methyl-10,11-dihydrobenzothiepin 5,5-dioxide and 8,10-dimethyl-10,11-dihydrobenzothiepin 5,5-dioxide.The reaction involves attack by the carbocation which forms at the ortho position of the adjacent benzene ring.

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