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210684-42-7

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210684-42-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 210684-42-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,0,6,8 and 4 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 210684-42:
(8*2)+(7*1)+(6*0)+(5*6)+(4*8)+(3*4)+(2*4)+(1*2)=107
107 % 10 = 7
So 210684-42-7 is a valid CAS Registry Number.

210684-42-7Relevant articles and documents

Novel fragmentation reaction of 2-alkyl- and 2,4-dialkyl-3-iodo-1- oxocyclohexan-2,4-carbolactones

Khim, Seock-Kyu,Dai, Mingshi,Zhang, Xuqing,Chen, Lei,Pettus, Liping,Thakkar, Kshitij,Schultz, Arthur G.

, p. 7728 - 7733 (2007/10/03)

2-Alkyl- and 2,4-dialkyl-3-iodo-1-oxocyclohexan-2,4-carbolactones undergo lithium hydroxide- and lithium alkoxide-induced fragmentation reactions to provide butenolides, γ-hydroxycyclohexenones, and/or γ- butyrolactones. In general, product distribution is governed by two factors: (1) the nature of nucleophiles and (2) the steric bulkiness of the substituents at C-2 and C-4 of the cyclohexanones. Lithium hydroxide-induced fragmentation provides butenolides and γ-hydroxycyclohexenones. In contrast, lithium alkoxide-promoted fragmentation results in predominantly 5-substituted γ-butyrolactones along with a small amount of butenolides in limited cases. Fragmentation products induced by lithium hydroxide are largely influenced by the steric bulkiness of the substituents at C-2 and C-4 of the cyclohexanone ring. The bulky substituents render the exclusive formation of butenolides.

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