Ammonia chemical ionization mass spectrometry of substituted phenylpropanoids and phenylalkyl phenyl ethers

摘要: The ammonia chemical ionization (NH3/CI) spectra of phenylpropanoids and substituted phenylalkyl phenyl ethers containing α-hydroxy or α-carbonyl functional groups are discussed. Fragmentation reactions which occur in the temperature range 180–450°C examined to model pyrolysis mass spectrometric experiments lignin. Hydroxycinnamyl alcohols show abundant [M + H − H2O]+ elimination ions a lesser extent NH4 substitution while hydroxycinnamic acids predominantly H]+ NH4]+ ions. interpretation group information is facilitated by using trideuterioammonia (ND3) [15N] (15NH3) as reagent gases. Labile hydrogens undergo essentially complete exchange upon ND3/CI number hydroxyl readily determined comparison nH nD ND4]+ adduct Incomplete HD observed for enolizable aromatic protons.