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27675-36-1

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27675-36-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 27675-36-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,7,6,7 and 5 respectively; the second part has 2 digits, 3 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 27675-36:
(7*2)+(6*7)+(5*6)+(4*7)+(3*5)+(2*3)+(1*6)=141
141 % 10 = 1
So 27675-36-1 is a valid CAS Registry Number.

27675-36-1Relevant articles and documents

STEREOSPECIFICITY OF 1,3-DIPOLAR CYCLOADDITIONS OF CYCLIC NITRONES TO (E) and (Z)-β-NITROSTYRENES

Burdisso, Marina,Gamba, Anna,Gandolfi, Remo,Pevarello, Paolo

, p. 1835 - 1846 (2007/10/02)

3,4-Dihydroisoquinoline-N-oxide (1) reacted readily with (E)-β-nitrostyrene in a regiospecific reaction to give a mixture of 4-nitro-5-phenylisoxazolidines 3a and 4a resulting from endo and exo (with respect to the nitro group) transition states, respectively.This cycloaddition was found reversible under mild conditions.A careful study disclosed >= 99.89percent stereoselectivity thus narrowly circumscribing the possibility of stereochemical leakage over the cycloaddition and cycloreversion processes.Moreover, our experimental data showed that eventual loss of stereochemistry should be ascribed to base catalysed isomerizations in the adducts and/or educts.The reaction of 1 with (Z)-β-nitrostyrene (exo specific and regiospecific) turned out to be faster than that of the (E)-isomer.This is the first example of higher reactivity of a cis than a trans-alkene in 1,3-dipolar cycloadditions.The endo-trans adduct 3a cycloreverted faster than the exo-trans isomer 4a which in turn underwent fragmentation more readily than the exo-cis 6a.The cycloreversion rate was slightly enhanced by increased solvent polarity.This study was extended to the reaction of 5,5-dimethylpyrroline-N-oxide with both the cited dipolarophiles.

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