European Journal of Organic Chemistry
Volume 2006, Issue 4 , Pages 1050 - 1056
Synthesis of Some New Substituted Photochromic N,N-Bis(spiro[1-benzopyran-2,2-indolyl])diazacrown Systems with Substituent Control over Ion Chelation
Craig J. Roxburgh 1 2 *, Peter G. Sammes 1
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http://dx.doi.org/10.1002/ejoc.200500681