in N,N-dimethyl-formamide

1: [2-(13)C]-methoxymethoxyacetic acid methyl ester With N-bromosuccinmide; dibenzoyl peroxide in tetrachloromethane Heatingirradiation; 2: 2-hydroxy-4-methoxynitrobenzene With potassium carbonate in acetone 2 h; Heating;