First synthesis of (1,2-13C2)-monolignol glucosides

The monolignol glucosides (1,2-13C2)-p-glucocoumaryl alcohol, (1,2-13C2)-coniferin and (1,2-13C2)-syringin, and the glucosides of (1,2-13C2)-p-coumaric, (1,2-13C2)-ferulic and (1,2-13C2)-sinapic acids were synthesized by condensation of the corresponding aldehydes with (1,2,3-13C3)-malonic acid. The free acids were converted to the acyl chlorides prior to their reduction to alcohols.