Novel rearrangement of secondary alkoxyalkyl radicals during addition to a double bond. Steric shielding in the formation of tertiary alkoxyethyl radicals
作者:Oldřich Paleta、Jan Hajduch、Stanislav Bőhm
DOI:10.1016/s0040-4039(01)02150-5
日期:2002.1
The participation of a 1,3-hydrogen shift in initially formed secondary alkoxyethyl radicals R1R2CH-O-CH-CH3 during their free-radical chain additions to methyl 2,3,3-trifluoroacrylate has been confirmed using a deuterium marked additive. Indirect evidence has been obtained for a partial 1,3-hydrogen shift in secondary radicals CH3(CH2)n-CH-O-CH3 to primary radicals CH3(CH2)n-CH2-O-CH2. Initial formation
已经证实,使用氘证实了在最初形成的仲烷氧基乙基自由基R 1 R 2 CH-O-CH-CH 3自由基加成到2,3,3-三氟丙烯酸甲酯的过程中1,3氢转移的参与。标记的添加剂。已获得间接证据,表明仲自由基CH 3(CH 2)n -CH-O-CH 3中的部分1,3-氢转移为伯自由基CH 3(CH 2)n -CH 2 -O-CH 2。叔烷氧基乙基自由基R 1 R 2 C-O-CHR 3 R的初始形成由于空间因素,未在繁殖步骤中观察到4。