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A synthetic procedure for the preparation of unsymmetrically protected 1,10‐diaza‐18‐crown‐6 has been elaborated. In contrast to previously published routes, no unprotected 1,10‐diaza‐18‐crown‐6 is needed as precursor and cheap bulk chemicals can be used.
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We thank the Fonds der Chemischen Industrie for support of this work.
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