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A new benzocoumarin bearing an amino group is proposed as a photocleavable protecting group for carboxylic acids. The novel heterocycle, 6‐amino‐4‐chloromethyl‐2‐oxo‐2H‐naphtho[1,2‐b]pyran was used in the preparation of ester conjugates of butyric acid, and of the corresponding mono‐ and dimethylated or ethylated derivatives. The photolability of the ester conjugates was studied by irradiation at...
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