The infrared spectra of conifer lignin model compounds and degradation products were determined, and characteristic frequencies of carbonyl groups, ethylenic double bonds, aromatic rings, and hydroxyl groups are presented. These results are applied to lignins isolated from five different coniferous genera. The functional groups occurring in the lignin molecule are discussed and related to the mode of isolation.

The pmr spectra of a number of trimethylsilyl ethers of simple alcohols have been reported: H.A. Bruñe, Chem. Ber., 97, 2829(1964. Comparison of their chemical shifts to those of the corresponding alcohols indicate an upfield of shift of the signal for the protons on the oxygenated carbon upon silylation. (12) A.

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