Catalytic Effect of Crown Ethers in the Bromination of 2-Alkyl-substituted 1,3-Dioxacyclanes
Bromination of 2-alkyl-1,3-dioxacyclanes with molecular bromine in the presence of crown ethers in benzene (chloroform) results, regardless of the acetal ring size, in exclusive formation of 2-(1-bromoalkyl)-1,3-dioxacyclanes in near-quantitative yields. The use of crown ethers allows the bromination to be accomplished at room temperature.
Kotlyar,Pluzhnik-Gladyr'
p. 914 - 916
(2007/10/03)
CHARACTER OF THE PRODUCTS OF BROMINATION OF 1,3-DIOXACYCLANES WITH N-BROMOSUCCINIMIDE
The dependence of the character and composition of the products of the reaction of equimolar amounts of N-bromosuccinimide and 1,3-dioxacyclanes on the ring size and the character of the substituent in the 2 position of the 1,3-dioxacyclane ring was examined.Reasons for the primary formation of bromination products of different types for five-, six-, and seven-membered cyclic acetals are proposed.
Kotlyar, S. A.,Kamalov, G. L.
p. 118 - 119
(2007/10/02)
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