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Carbon dioxide elimination from formyloxyalkynes - to give alkynyl esters,alkynes and allenes
Carbon dioxide elimination from formyloxyalkynes - to give alkynyl esters,alkynes and allenes
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机译:从甲酰氧基炔烃中消除二氧化碳-生成炔基酯,炔烃和丙二烯
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摘要
CO2 is split off from a cpd. of formula: R4CH(OCHO)-C triple bond C-CR1R2R3 (where R1 is H, 1-6C alkyl or OCOR5; R2-R5 are H or 1-6C alkyl; and when R1 = OCOR5, R2 = H) by contacting at 140-260 degrees C with a finely-divided gp. Ib metal (pref. Cu) and/or Cd or Zn and/or Ni, Pd or Pb or Pt or a cpd. of these metals which liberate the free metal under the reaction conditions. The prodts. are alkynyl formates, alkynyl alkanoates, alkynes and the corresp. isomeric allenes. The prodts. are intermediates, e.g. for insecticides, acaricides, corrosion inhibitors, vitamin E and plant growth promoters.
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