Elimination of nitrous acid is the exclusive reaction path for the thermal decomposition of the nitroalkanes 1, 2 and 5. Homolytic CC-cleavage cannot compete. A concerted β-elimination is the favoured mechanism.
Methyl group migration in the reactions of alkynyltrialkylborates
作者:Andrew Pelter、Robert A. Drake
DOI:10.1016/s0040-4039(00)80450-5
日期:1988.1
It is shown that the methyl group cannot be used as a cheap, non-migrating group in the reactions of alkynyltrialkylborates with electrophiles. However, trimethylborane can be used as a methylboronating agent for alkynes, given the right choice of solvent, and this may be of use in terpene synthesis.
Solvolysis of 2-aryl-3,3-dimethyl-2-butyl -nitrobensoates
作者:Kwang-Ting Liu、Mann-Yan Kuo
DOI:10.1016/s0040-4020(01)85982-2
日期:1988.1
Solvolysis of 2-aryl-3,3-dimethyl-2-butyl p-nitrobenzoates (4a-4d) and the 1,1,1-trideuterio derivatives (5a, 5b, 5c) in HFIP exhibited a high kinetic isotope effect, k(CH3)/k(CD3) = 1.90 at 60°C for the deactivating substrates 4c vs 5c. This effect decreased significantly with increasing electron releasing of the substituent on the aryl ring. Hammett-Brown treatment of the rate data for 4 yielded
作者:Zhao Chen、Jinhua Liang、Jun Yin、Guang-Ao Yu、Sheng Hua Liu
DOI:10.1016/j.tetlet.2013.08.049
日期:2013.10
A novel intermolecular Alder-enereaction based on aryne and olefins was developed. We performed this transformation under mild conditions such as at room temperature, and this reaction displayed high selectivity and good yields only in the presence of CsF. Hence, the intermolecular Alder-enereaction of aryne with olefins provides an effective route to synthesize derivatives of olefins.