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67682-37-5

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67682-37-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 67682-37-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,6,8 and 2 respectively; the second part has 2 digits, 3 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 67682-37:
(7*6)+(6*7)+(5*6)+(4*8)+(3*2)+(2*3)+(1*7)=165
165 % 10 = 5
So 67682-37-5 is a valid CAS Registry Number.

67682-37-5Downstream Products

67682-37-5Relevant articles and documents

The Thermal Ring Opening of 3,3-Disubstituted Cyclobutenes

Curry, Michael J.,Stevens, Ian D. R.

, p. 1391 - 1398 (2007/10/02)

The rates of the thermal unimolecular isomerisation of 3-t-butyl-3-methylcyclobutene and 3-methyl-3-phenylcyclobutene have been measured in the gas phase over the temperature ranges 158-190 deg C and 120-180 deg C, respectively.They are correlated by the Arrhenius expressions k = 1014.08 +/- 0.30exp(-150.8 +/- 2.5/RT) s-1 and k = 1012.50 +/- 0.12exp(-126.15 +/- 0.95/RT) s-1, respectively.The ratio of Z- to E-isomer of the butadienes formed has been measured both for these two and for the 3-methyl-3-R-cyclobutenes, where R = isopropyl, n-propyl, cyclopropyl, pentadeuterioethyl, 4-methoxyphenyl, 3-methoxyphenyl, and 4-cyanophenyl.In each case the proportion of Z-isomer formed is much larger than would be predicted on steric grounds.For the aryl compounds an attractive interaction during the formation of the Z-diene is proposed to account for its excess formation.For the alkyl substituents, a repulsive electronic interaction between the group and the developing remote double bond should be larger for methyl than for the other alkyl groups, accounting for the observed product ratios.The rates of isomerization of the 3-aryl-3-methylcyclobutenes at 161 deg C correlate with the LUMO of the aromatic ring.The conclusions are shown to apply to results which have been reported by other authors.

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